目錄
Japanese 「間（あいだ）」 and 「間に（あいだに）」 are both easily translated as “during…” or “while…,” which makes them look very similar, but they cannot simply be used interchangeably. 「夏休みの間、毎日アルバイトをした」 means that someone worked part-time throughout the summer vacation, while 「夏休みの間に、北海道へ旅行した」 means that the trip to Hokkaido took place sometime during the summer vacation. 「夏休みの間に三回旅行した」 is also completely natural, so 「間に」 should not be memorized as something that can happen only once. A better way to decide is to check whether the event in the second clause continues along with the period in the first clause, or whether it simply occurs, is completed, or changes within that period.
What Do Japanese 「間」 and 「間に」 Mean? The Difference Is How the Second Clause Uses the Time Period
「間」 indicates a period during which an action or state continues, and the second clause usually also remains true throughout that period. 「間に」 likewise establishes a span of time, but the second clause only needs to occur, be completed, or undergo a change within that period. It does not need to continue in parallel with the whole period.
You can imagine the first clause as a timeline. With 「間」, the second clause stretches along that timeline together with it. With 「間に」, the second event falls somewhere within the range of that timeline. The event can be very short, take some time, or even happen several times, as long as the sentence is not describing the second clause as continuing from beginning to end throughout the entire period.
| Expression | Time Sense of the Second Clause | Common Content | Example |
|---|---|---|---|
| 「間」 | Continues together with the period in the first clause | Work, study, waiting, living somewhere, and other continuing states | 夏休みの間、毎日働いた |
| 「間に」 | Happens, is completed, or becomes established within the period | Arriving, finishing, making a phone call, changing, discovering, etc. | 夏休みの間に旅行した |
- Example: 母が料理をしている間、私は宿題をしていました。
Kana: ははがりょうりをしているあいだ、わたしはしゅくだいをしていました。
Translation: While my mother was cooking, I was doing my homework.
Cooking and doing homework are treated as two actions continuing at the same time, so 「間」 is used. - Example: 母が料理をしている間に、宿題を終わらせました。
Kana: ははがりょうりをしているあいだに、しゅくだいをおわらせました。
Translation: While my mother was cooking, I finished my homework.
The focus is that the homework was completed during the period when the mother was cooking, so 「間に」 is used. - Example: 留守の間に、荷物が届きました。
Kana: るすのあいだに、にもつがとどきました。
Translation: A package arrived while I was away.
「届く」 is an event that occurs during the period of absence. It does not continue throughout the entire period.
Japanese 「間／間に」 Conjugation Rules: How to Use Them With Nouns, Verbs, and Adjectives
Both 「間」 and 「間に」 need something before them that can establish a continuing period of time. The most common forms are 「noun＋の間（に）」 and 「Vている＋間（に）」. Verbs such as 「日本にいる」, which themselves describe a continuing state, can also take 「間」 directly.
Adjectives can also be used, as in 「暑い間」 and 「元気な間」. However, if what you really want to express is “do something while this state still lasts, before it changes,” actual conversation often prefers 「うちに」. For example, 「元気なうちに旅行したい」 conveys the sense that the current state may change more clearly than 「元気な間に旅行したい」.
| What Comes Before | Structure | Example |
|---|---|---|
| Noun | N＋の間／の間に | 夏休みの間、留守の間に |
| Continuing action | Vている＋間／間に | 働いている間、寝ている間に |
| Continuing-state verb | V dictionary form＋間／間に | 日本にいる間、日本にいる間に |
| い-adjective | Aい＋間／間に | 暑い間 |
| な-adjective | Aな＋間／間に | 元気な間 |
「Vている＋間／間に」｜How to Choose 「間」 or 「間に」 With an Ongoing Action
Forms such as 「働いている」「寝ている」「待っている」 already describe continuing situations, so they work naturally to establish a time range. If the second clause also continues throughout that period, use 「間」. If the second event is completed or occurs within that period, use 「間に」.
- Example: 電車を待っている間、本を読んでいました。
Kana: でんしゃをまっているあいだ、ほんをよんでいました。
Translation: I was reading a book while waiting for the train.
Both 「待つ」 and 「読む」 are treated as continuing simultaneously, so 「間」 is used. - Example: 電車を待っている間に、友だちにメッセージを送りました。
Kana: でんしゃをまっているあいだに、ともだちにめっせーじをおくりました。
Translation: I sent a message to a friend while waiting for the train.
Sending the message was completed during the waiting period and did not need to continue until the train arrived. - Example: シャワーを浴びている間に、電話がかかってきました。
Kana: しゃわーをあびているあいだに、でんわがかかってきました。
Translation: I received a phone call while I was taking a shower.
Taking a shower creates the background period, while the phone call is an event that occurs within it.
「N＋の間／の間に」｜How to Use Them With Vacations, Meetings, Absence, and Other Nouns
Nouns such as vacations, meetings, trips, and absence from home already represent spans of time, so they can directly take 「の間」 or 「の間に」. The difference is still determined by the second clause, not by the noun before them.
- Example: 夏休みの間、毎日アルバイトをしていました。
Kana: なつやすみのあいだ、まいにちあるばいとをしていました。
Translation: I worked part-time every day during summer vacation.
「毎日」 extends the part-time work throughout the summer vacation, so 「間」 is natural. - Example: 夏休みの間に、北海道へ旅行しました。
Kana: なつやすみのあいだに、ほっかいどうへりょこうしました。
Translation: I traveled to Hokkaido during summer vacation.
The trip is one itinerary completed within the summer vacation period, so 「間に」 is used. - Example: 会議の間に、部長から電話がありました。
Kana: かいぎのあいだに、ぶちょうからでんわがありました。
Translation: The department manager called during the meeting.
The meeting lasts for a period of time, while the phone call occurs at some point within it.
How to Use Japanese 「間」: The Second Clause Continues Throughout the Period
「間」 is suitable when two actions or states overlap in time. The second clause does not necessarily have to continue without interruption every single second, but the speaker presents it as a continuing situation during that period rather than as something completed at a particular point.
Expressions such as 「ずっと」「毎日」「ずっと〜ている」 often appear with 「間」 because they themselves carry a sense of continuation.
「間」 Usage ①｜Two Actions Continue During the Same Period
The first clause provides a continuing period, and the second clause remains in effect during that period as well. Listening to music throughout cooking, working while living in Japan, or reading while a child is sleeping all belong to this usage.
- Example: 料理をしている間、ずっと音楽を聞いていました。
Kana: りょうりをしているあいだ、ずっとおんがくをきいていました。
Translation: I listened to music the whole time I was cooking.
「ずっと」 directly shows that listening to music largely overlaps with the cooking period. - Example: 日本にいる間、日本語だけで生活してみたいです。
Kana: にほんにいるあいだ、にほんごだけでせいかつしてみたいです。
Translation: While I’m in Japan, I want to try living using only Japanese.
「日本にいる」 is a continuing state, and the second clause describes a way of living that continues throughout that period. - Example: 子どもが寝ている間、静かに本を読んでいました。
Kana: こどもがねているあいだ、しずかにほんをよんでいました。
Translation: I quietly read a book while the child was sleeping.
Reading is described as continuing together with the child’s sleep, so 「間に」 is not used.
「間」 Usage ②｜A Certain State Remains True Throughout the Entire Period
「間」 can connect not only concrete actions but also states such as a store being closed, hot weather continuing, or someone staying away from home. The second clause describes a situation that generally applies throughout that period.
- Example: 店が休みの間、オンライン注文だけ受け付けます。
Kana: みせがやすみのあいだ、おんらいんちゅうもんだけうけつけます。
Translation: While the store is closed, only online orders will be accepted.
Accepting online orders is the arrangement that applies throughout the entire closure period. - Example: 暑い間は、窓を開けたまま寝ています。
Kana: あついあいだは、まどをあけたままねています。
Translation: While the weather is hot, I sleep with the window open.
「間は」 presents the hot period as the topic and also makes it easy to contrast it with what happens once the weather cools down. - Example: 出張で東京にいる間は、ホテルから会社まで電車で通っていました。
Kana: しゅっちょうでとうきょうにいるあいだは、ほてるからかいしゃまででんしゃでかよっていました。
Translation: While I was in Tokyo on a business trip, I commuted from the hotel to the office by train.
The commuting method remains consistent throughout the period of the Tokyo business trip, so 「間は」 is used.
How to Use Japanese 「間に」: Something Happens or Is Completed Within a Period
「間に」 treats the preceding action or state as a time range, and the second clause only needs to fall somewhere within that range. Buying something, sending an email, making a phone call, a package arriving, or equipment stopping all work naturally with this structure.
This is also the point that most needs correction in the original explanation: 「間に」 cannot be reduced to “something happens only once.” For example, 「夏休みの間に三回映画を見た」 is completely valid because all three movie visits occur within the summer vacation period, rather than describing someone as continuously watching movies throughout the whole vacation.
「間に」 Usage ①｜Completing a Planned Task Within a Period
The first clause often acts like a span of time that can be used, and the second action is completed within it. Going to the bank during lunch break, taking an exam while studying abroad, or replying to a message while waiting for a train are common examples.
- Example: 昼休みの間に、銀行へ行ってきます。
Kana: ひるやすみのあいだに、ぎんこうへいってきます。
Translation: I’ll go to the bank and come back during my lunch break.
The whole trip to the bank needs to be completed before the lunch break ends, so 「間に」 is used. - Example: 日本にいる間に、一度は歌舞伎を見たいです。
Kana: にほんにいるあいだに、いちどはかぶきをみたいです。
Translation: While I’m in Japan, I want to see kabuki at least once.
「一度は」 clearly indicates one viewing experience planned within the period of being in Japan. - Example: 電車を待っている間に、メールを一本返信しました。
Kana: でんしゃをまっているあいだに、めーるをいっぽんへんしんしました。
Translation: I replied to one email while waiting for the train.
The email reply is completed within the waiting period and does not need to continue throughout the entire wait.
「間に」 Usage ②｜Another Event Happens During a Continuing State
The second clause can also describe an unplanned event. An earthquake happening while someone is asleep, a package arriving while someone is out, or a phone ringing while someone is in the shower all follow the pattern of “background period + event within that period.”
- Example: 寝ている間に、地震がありました。
Kana: ねているあいだに、じしんがありました。
Translation: There was an earthquake while I was sleeping.
Sleep continues for a period of time, while the earthquake occurs within that period. - Example: 外出している間に、荷物が届いたようです。
Kana: がいしゅつしているあいだに、にもつがとどいたようです。
Translation: It looks like the package arrived while I was out.
「届く」 has a clear arrival result, so 「間に」 is used. - Example: 買い物をしている間に、雨が降り出しました。
Kana: かいものをしているあいだに、あめがふりだしました。
Translation: It started raining while I was shopping.
「降り出す」 indicates that the change of rain beginning occurred during the shopping period.
「間に」 Usage ③｜More Than One Event Can Happen Within the Same Period
The real restriction of 「間に」 is that the event must fall within the specified period, not that it can happen only once. If the second clause contains frequency expressions such as 「三回」「何度か」「いくつか」, 「間に」 still works as long as all of those events occur during the period.
- Example: 夏休みの間に、三回映画館へ行きました。
Kana: なつやすみのあいだに、さんかいえいがかんへいきました。
Translation: I went to the movie theater three times during summer vacation.
All three visits happened within the summer vacation period, so 「間に」 is completely natural. - Example: 留学している間に、何度か京都を訪れました。
Kana: りゅうがくしているあいだに、なんどかきょうとをおとずれました。
Translation: I visited Kyoto several times while studying abroad.
Although this is not a single event, each visit falls within the study-abroad period. - Example: 会議の間に、何度か質問が出ました。
Kana: かいぎのあいだに、なんどかしつもんがでました。
Translation: Several questions came up during the meeting.
The questions occur at different points during the meeting rather than describing the entire meeting as one continuous state of questioning.
What Is the Difference Between Japanese 「間」 and 「間に」? Comparing the Same Types of Sentences
Both 「間」 and 「間に」 first establish a span of time. The difference is how the second clause fits into that span. 「間」 usually presents the second clause as continuing together with the action or state in the first clause. 「間に」 means that something happens, is completed, or changes within that period. The event can occur once or several times, so 「間に」 should not be memorized as a marker of “one-time events.”
| Comparison | 「間」 | 「間に」 |
|---|---|---|
| Basic meaning | The second clause continues together with the preceding period | The second clause occurs or is completed within the preceding time range |
| Relationship with the first clause | Two things overlap in time | The first clause provides a time range, and the second event falls within it |
| Must the second clause continue throughout the whole period? | Usually presented as continuing during that period | No, it only needs to occur within the period |
| Can the second clause itself take some time? | Yes, and that continuity is usually the point | Yes. It does not have to be instantaneous as long as the whole event falls within the period |
| Can it describe one event? | Usually not focused on a single event | Yes |
| Can it describe repeated events? | Yes, when describing a repeated or continuing habit, but the focus remains on the overall period | Yes, including expressions such as 「三回」「何度か」 |
| Common second clauses | Working, reading, waiting, living somewhere, commuting, continuously listening to music | Finishing homework, making a call, arriving, rain beginning, discovering something, moving house |
| Common expressions | ずっと、毎日、〜ている、〜続ける | 一度、三回、何度か、終える、届く、始まる |
| With 「ずっと」 | Usually very natural | If the sentence emphasizes continuous action throughout the whole period, 「間に」 is usually not selected |
| With frequency expressions | Not the main criterion | 「一度」「三回」「何度か」 are all possible |
| With a completed result | Usually not the most natural choice | Very common, as in 「宿題を終えた」 |
| With a sudden event | Usually not used | Very common, as in 「電話がかかってきた」 |
| Mental image | The two events extend together along the timeline | The preceding time is a range, and the second event happens somewhere inside it |
| Typical example | 母が料理をしている間、宿題をしていました。 | 母が料理をしている間に、宿題を終えました。 |
| Meaning | While my mother was cooking, I was doing homework. | While my mother was cooking, I finished my homework. |
| Best question to ask | Is the second clause treated as something that continues during this period? | Does the sentence work as long as the second event happens or is completed within this period? |
▌「間」 vs 「間に」｜Continuing Throughout the Period vs Being Completed Within It
「母が料理をしている間、宿題をしていた」 places two continuing actions side by side. 「母が料理をしている間に、宿題を終えた」 places the completion of the homework inside the cooking period.
❌ Unnatural: 母が料理をしている間に、私は隣でずっと見ていました。
✅ Natural: 母が料理をしている間、私は隣でずっと見ていました。
「ずっと見ていました」 clearly describes a continuing state, so 「間」 better matches the sentence’s time structure.
▌「間」 vs 「間に」｜「間に」 Does Not Mean the Event Must Be Instantaneous
The event following 「間に」 can have its own duration. For example, 「子どもが寝ている間に夕食を作った」 is completely natural even though making dinner clearly takes more than a second. The whole action is completed within the period when the child is sleeping, so 「間に」 is still used.
✅ 子どもが寝ている間に、夕食を作りました。
✅ 夏休みの間に、本を三冊読みました。
There is no need to force the distinction into “instantaneous verbs.” A more practical question is whether the second clause is treated as something completed or established within the period.
▌Comparing 「間」 and 「間に」 in the Same Situations
| Time Period | Using 「間」 | Using 「間に」 | Difference in Nuance |
|---|---|---|---|
| 母が料理をしている | 母が料理をしている間、宿題をしていました。 | 母が料理をしている間に、宿題を終えました。 | 「宿題をしていた」 continues alongside the cooking; 「宿題を終えた」 is completed during the cooking period |
| 電車を待っている | 電車を待っている間、本を読んでいました。 | 電車を待っている間に、友だちにメッセージを送りました。 | Reading is presented as continuing during the wait; sending the message is completed during the wait |
| 夏休み | 夏休みの間、毎日アルバイトをしていました。 | 夏休みの間に、北海道へ旅行しました。 | Part-time work continues throughout the vacation; the trip takes place within it |
| 日本にいる | 日本にいる間、日本語だけで生活してみたいです。 | 日本にいる間に、一度は歌舞伎を見たいです。 | The first describes a way of life maintained while in Japan; the second schedules one viewing experience during the stay |
| 会議 | 会議の間、ずっとメモを取っていました。 | 会議の間に、何度か質問が出ました。 | Note-taking continues throughout the meeting; questions arise at several points during it |
The most important point to retain is this: 「間に」 is not a marker of “an instant” or “only once.” Sentences such as 「夏休みの間に三回映画館へ行きました」 and 「留学している間に何度か京都を訪れました」 are perfectly natural because the real question is whether those events occur within the time range established by the first clause.
What Is the Difference Between Japanese 「間に」 and 「うちに」? Neutral Time Period vs “While You Still Can”
Both 「間に」 and 「うちに」 can indicate that something happens while a certain period or state continues, but they focus on different things. 「間に」 neutrally marks out a time range, and the second event only needs to occur within it. 「うちに」 often carries the feeling that the current state may change later, so something should be done while it still lasts. For example, 「日本にいる間に、日本料理を習いたい」 simply places learning Japanese cuisine within the period of living in Japan, while 「日本にいるうちに、日本料理を習いたい」 adds the nuance that it may become harder to learn once the speaker leaves Japan, so they want to do it now.
| Comparison | 「間に」 | 「うちに」 |
|---|---|---|
| Basic meaning | Something occurs or is completed during a certain period or state | Do something while a certain time or state still continues |
| Main focus | Which period the event occurs in | The current state has not changed yet |
| Time sense | More neutral, simply setting a time range | More likely to carry the sense of “while there is still time” |
| Does it imply that things will change later? | Not necessarily | Often |
| Sense of taking advantage of an opportunity | Usually weak | Usually stronger |
| Common second clause | Completing something, an event happening, a result appearing, arranging an activity | Completing something while it is still possible and before the current state changes |
| Suitable for clearly defined periods? | Very suitable, such as 「夏休みの間に」「会議の間に」 | Possible, but the focus is usually not the period itself but the possibility of the state changing |
| Suitable for objective events? | Very natural, such as a package arriving, a phone call coming, or rain beginning | Usually not the main use because 「うちに」 more often relates to a changing state |
| 「〜ない」 form | Possible, but it should not automatically be treated as the fixed pattern for “before…” | Very common for expressing “while it hasn’t happened yet” |
| 「暗くならない」 | 「暗くならない間に」 is usually less natural | 「暗くならないうちに」 is very natural |
| 「雨が降らない」 | 「雨が降らない間に」 is usually unnatural if the intended meaning is “before it rains” | 「雨が降らないうちに」 is very natural |
| 「知らない」 | 「知らない間に」 is common and means something happened while one was unaware | 「知らないうちに」 is also possible, but the point here is that 「Vない＋間に」 itself is not incorrect |
| Best question to ask | Are you simply saying that something happened within this time period? | Is there a sense that the current state may change, so something should be done now? |
| Typical example | 日本にいる間に、日本料理を習いたいです。 | 日本にいるうちに、日本料理を習いたいです。 |
| Natural English nuance | I want to learn Japanese cuisine while I’m in Japan. | I want to learn Japanese cuisine while I’m still in Japan. |
▌「Vない＋うちに」｜More Natural When You Mean “Before It Happens”
❌ Less natural: 暗くならない間に帰りましょう。
✅ Natural: 暗くならないうちに帰りましょう。
When you want to say “Let’s go home before it gets dark,” the real focus is that the light is about to change. In this kind of sentence, where you want to act before something happens, 「〜ないうちに」 is the most natural.
▌「雨が降らないうちに」｜Use 「うちに」 When You Are Concerned That the State May Change
❌ Less natural: 雨が降らない間に買い物に行こう。
✅ Natural: 雨が降らないうちに買い物に行こう。
The speaker expects that it may start raining later, so the sentence is not merely marking out a neutral period of time. It expresses the desire to take advantage of the current rain-free state.
▌「Vない＋間に」 Can Also Be Correct｜Using 「知らない間に」「会わない間に」
「Vない＋間に」 should not automatically be treated as incorrect. Expressions such as 「知らない間に」 and 「しばらく会わない間に」 are actually used. In these sentences, the negative condition itself forms a continuing period, roughly meaning “during the time when I did not notice” and “during the period when we did not see each other.”
- Example: 知らない間に、駅前に新しい店ができていました。
Kana: しらないあいだに、えきまえにあたらしいみせができていました。
Translation: Before I realized it, a new shop had opened in front of the station.
「知らない間に」 is a common expression indicating that something happened during a period when the speaker was unaware. - Example: しばらく会わない間に、ずいぶん大きくなりましたね。
Kana: しばらくあわないあいだに、ずいぶんおおきくなりましたね。
Translation: You’ve grown so much since I last saw you.
「会わない」 describes a period during which the people did not meet, and the second clause presents a change that occurred during that period.
Therefore, what needs to be corrected is the idea that 「Vない＋間に」 works exactly like 「Vない＋うちに」 as a general productive rule. For sentences such as 「忘れないうちに」「暗くならないうちに」「雨が降らないうちに」, which mean “do something before this happens,” 「うちに」 is generally the more natural choice.
▌Comparing 「間に」 and 「うちに」 in the Same Situations
| Situation | Using 「間に」 | Using 「うちに」 | Difference in Nuance |
|---|---|---|---|
| Staying in Japan | 日本にいる間に、日本料理を習いたいです。 | 日本にいるうちに、日本料理を習いたいです。 | The first simply schedules learning during the stay; the second carries the feeling of learning now before leaving Japan |
| Before it gets dark | 暗くならない間に帰りましょう。△ | 暗くならないうちに帰りましょう。◎ | When you mean “let’s go home before it gets dark,” 「うちに」 is more natural because the light will change |
| Before it rains | 雨が降らない間に買い物に行こう。△ | 雨が降らないうちに買い物に行こう。◎ | The speaker expects it may rain, so 「うちに」 better matches the nuance |
| Not seeing someone for a while | しばらく会わない間に、ずいぶん大きくなりましたね。◎ | — | “Not seeing each other” forms a period, and the change occurs during it, so 「間に」 is possible |
| Being unaware | 知らない間に、駅前に新しい店ができていました。◎ | — | “Not knowing” forms a continuing state, and the shop appeared during it, so not all 「Vない＋間に」 forms are unnatural |
The most confusing point between these two patterns is actually 「〜ない」. 「Vない＋間に」 is not inherently wrong, as expressions such as 「知らない間に」「しばらく会わない間に」 clearly exist. However, when you want to say “do something before a certain event happens,” 「〜ないうちに」 is usually more natural. The best way to decide is to check whether the sentence merely establishes a time range or already carries the idea that “the current state is about to change.”
What Is the Difference Between Japanese 「間に」「中に」「までに」? Time Periods vs Deadlines
「間に」「中に」「までに」 can all sometimes be translated as “during…” or “by…,” but they view time differently. 「間に」 first requires a continuing period, and the following event happens within it. 「中に」 directly uses a noun to indicate that an activity is in progress or that something occurs within a period. 「までに」 specifies the latest time by which something must be completed, so when there is a deadline, 「までに」 is usually the appropriate choice.
| Comparison | 「間に」 | 「中に」 | 「までに」 |
|---|---|---|---|
| Basic meaning | Something occurs or is completed within a continuing period | During an activity or within a certain period | Complete something no later than a certain time |
| Main time sense | The first clause creates a time span, and the second event falls inside it | A noun directly marks an activity or period | Sets the final deadline |
| What usually comes before | Plain-form verb, noun＋の, adjective | Mainly nouns | Time, date, weekday, deadline |
| Common structure | Vている＋間に、N＋の間に | N＋中に | N＋までに |
| Must the preceding expression contain duration? | Yes, it must be able to form a period or state | Usually an activity, period, or noun that can be interpreted as a time range | No, it only needs to specify a point in time or deadline |
| What does the second clause usually express? | An event, completion, change, or repeated events | Something happening during an activity or being completed within a period | Something that must be completed before the deadline |
| Does it emphasize “currently in progress”? | The first clause may describe an ongoing action, but the focus is the whole time range | Forms such as 「会議中」「授業中」 directly mean “in the middle of” an activity | No |
| Does it carry a deadline nuance? | Usually no | Depends on the noun; 「今週中に」 can mean completed by the end of this week | Yes, very clearly |
| Can it describe a sudden event? | Yes, such as a package arriving while someone is away | Yes, such as a phone ringing during a meeting | Usually not |
| Can it describe completing a planned task? | Yes, such as going to the bank during lunch break | Yes, such as submitting something today | Very common, especially for work, applications, and submissions with deadlines |
| Common combinations | 留守の間に、寝ている間に、夏休みの間に | 会議中に、授業中に、今日中に、今週中に | 金曜日までに、5時までに、来月までに |
| Common English translation | During…, while… | During…, within… | By…, no later than… |
| Best question to ask | Does the event happen within the continuing period established by the first clause? | Is the preceding expression an activity or defined period that can be directly expressed as a noun? | Is the sentence specifying the latest time something must be completed? |
| Typical example | 会議の間に、電話がありました。 | 会議中に、電話がありました。 | 金曜日までに、資料を提出してください。 |
| Natural English nuance | There was a phone call during the meeting. | There was a phone call while the meeting was in progress. | Please submit the materials by Friday. |
▌「間に」 vs 「中に」｜Fully Describing a Period vs Expressing It Concisely With a Noun
✅ 会議の間に、電話がありました。
✅ 会議中に、電話がありました。
Both sentences mean that a phone call occurred during the meeting. 「会議中」 is more concise and directly treats “the meeting being in progress” as the background, while 「会議の間に」 more explicitly views the meeting as a span of time.
▌「間に」 vs 「までに」｜Time Range vs Deadline
✅ 今週の間に、必要な資料を整理します。
✅ 金曜日までに、必要な資料を提出します。
The first sentence simply means that the materials will be organized sometime during this week. The second sets Friday as the latest deadline. In work emails, applications, or document submissions, if there is a clear deadline, 「までに」 is usually more precise.
▌Comparing 「間に」 and 「中に」 in the Same Situations
| Situation | 「間に」 | 「中に」 | Difference |
|---|---|---|---|
| Meeting | 会議の間に、部長から電話がありました。 | 会議中に、部長から電話がありました。 | Both mean the call came during the meeting; 「会議中に」 is more direct and very common in everyday use |
| Class | 授業の間に、先生から連絡がありました。 | 授業中に、先生から連絡がありました。 | 「授業中」 directly means class is in progress; 「授業の間に」 treats the class as a time range |
| Study abroad | 留学している間に、何度か京都へ行きました。 | 留学中に、何度か京都へ行きました。 | The meanings are close; the first retains the full verb structure “while studying abroad,” while the second directly uses 「留学中」 to mean during the study-abroad period |
| Being out | 外出している間に、荷物が届きました。 | 外出中に、荷物が届きました。 | Both are possible; the second more concisely means “while out” |
「間に」 and 「中に」 can often express similar meanings, but they should not be treated as completely identical. 「間に」 can follow verbs, nouns, and states to establish an entire time period, while 「中に」 mainly follows nouns such as 「会議中」「授業中」「旅行中」 and directly treats the activity itself as the time background.
▌Both 「中に」 and 「までに」 Can Express Deadlines, but Their Focus Is Different
「中に」 also has another very common use, as in 「今日中に」「今週中に」. In this usage, it no longer simply means that an activity is in progress. Instead, it means that something must be completed before the specified period ends, so it is often translated as “within today” or “within this week.”
| Situation | 「中に」 | 「までに」 | Difference |
|---|---|---|---|
| Complete today | 今日中に返信します。 | 今日までに返信します。 | 「今日中に」 means the reply will happen within today; 「今日までに」 sets today as the final deadline |
| Submit this week | 今週中に資料を提出します。 | 金曜日までに資料を提出します。 | The first requires completion within this week; the second directly specifies Friday as the deadline |
| Handle this month | 今月中に手続きを済ませます。 | 8月31日までに手続きを済ませます。 | The first uses the whole month as the completion range; the second sets an exact date as the deadline |
So although 「中に」 and 「までに」 can both sometimes mean completing something before a certain time, their focus differs. 「今週中に」 treats the whole week as the usable range, with completion required before the week ends. 「金曜日までに」 directly identifies Friday as the final deadline. In work emails, applications, or document submissions, if an exact date or time limit has already been specified, 「までに」 is usually the most direct choice.
Practical Japanese for Travel With 「間／間に」: Waiting for Trains, Waiting for Food, and Being Out
「間」 and 「間に」 are very useful while traveling because waiting in line, waiting for trains, staying somewhere, and moving from place to place naturally create spans of time. In actual conversation, you do not need to consciously analyze the grammar every time. Simply check whether the second clause describes a state continuing throughout the period or something completed within that period.
▌Situation ①｜Buying a Drink While Waiting for the Train
A：電車が来るまで、あと十分あります。
でんしゃがくるまで、あとじゅっぷんあります。
There are ten minutes until the train arrives.
B：じゃあ、待っている間に飲み物を買ってきます。
じゃあ、まっているあいだにのみものをかってきます。
Then I’ll go buy a drink while we’re waiting.
📌 Grammar Point: 「買ってくる」 needs to be completed within those ten minutes of waiting, so 「間に」 is used. If the second clause were 「待っている間、ずっと本を読んでいました」, 「間」 would be used instead.
▌Situation ②｜Checking the Itinerary While Waiting for Food at a Restaurant
A：料理が来るまで少しかかりそうですね。
りょうりがくるまで、すこしかかりそうですね。
It looks like the food will take a little while to arrive.
B：待っている間、明日の予定を見ておきましょう。
まっているあいだ、あしたのよていをみておきましょう。
Let’s look over tomorrow’s plans while we wait.
📌 Grammar Point: Here, reviewing the itinerary is treated as something continuing during the waiting period, so 「間」 is used. If you changed it to 「待っている間に予約を済ませましょう」, the meaning would be that the reservation should be completed during the waiting period.
▌Situation ③｜Returning to the Hotel and Finding That a Package Has Arrived
A：外出している間に、荷物が届いていました。
がいしゅつしているあいだに、にもつがとどいていました。
The package arrived while I was out.
B：フロントで預かっていますよ。
ふろんとであずかっていますよ。
The front desk is holding it for you.
📌 Grammar Point: Being out forms the background period, while 「届く」 is an arrival event completed during that period, so 「間に」 is used.
Cultural Notes:
- 「間」 is also often followed by 「は」, becoming 「間は」. For example, 「日本にいる間は毎日電車で通勤した」 presents the entire period of living in Japan as a topic and can also imply a contrast with what happened after that period ended. Plain 「間」 mainly describes two situations continuing at the same time, while 「間は」 adds a topic or contrast nuance.
- 「間に」 is not grammar meaning “only once.” The real condition is that the second event occurs within the specified period rather than continuing together with the entire period. Therefore, sentences such as 「夏休みの間に三回旅行した」 and 「留学中に何度か引っ越した」 are completely natural.
- 「うちに」 and 「間に」 are often both translated as “while…” or “during…,” causing the distinction to disappear. 「うちに」 more often suggests that the current state may change later, while 「間に」 is more neutral when you simply want to state when something occurred.
How Do Japanese 「間／間に」 Compare With Korean 「-는 동안／-는 동안에」?
Japanese 「間」 and Korean 「-는 동안」 can both set the preceding action or state as a background period. If the second clause also continues or repeats during that period, Japanese usually uses 「間」. If the second clause occurs, is completed, or produces a result within the period, Japanese commonly uses 「間に」.
Korean can also add the time particle 「에」 after 「동안」, but the distinction between 「동안」 and 「동안에」 is not as fixed as the distinction between Japanese 「間」 and 「間に」. 「에」 can strengthen the sense of “within this period,” so it often appears with one-time events or completed actions, but many sentences remain natural without 「에」. When translating Korean into Japanese, you still need to choose 「間」 or 「間に」 according to whether the second clause describes a continuing action or an event occurring within the period.
◆ Similar Grammar ①: Korean 「-는 동안」
Korean 「-는 동안」 indicates the period during which an action continues. If the second clause also continues or repeats during that period, it can usually be compared with Japanese 「〜ている間」. Here, 「동안」 mainly establishes the time background and does not emphasize that the second action is completed at a particular point.
- Example: 엄마가 요리하는 동안 저는 숙제를 하고 있었어요.
Romanization: eom-ma-ga yo-ri-ha-neun dong-an jeo-neun suk-je-reul ha-go i-sseo-sseo-yo.
Translation: While my mother was cooking, I was doing my homework.
Corresponds to Japanese 「母が料理をしている間、私は宿題をしていました」. Cooking and doing homework continue during the same period, so Japanese uses 「間」 without 「に」. - Example: 친구가 운전하는 동안 저는 음악을 듣고 있었어요.
Romanization: chin-gu-ga un-jeon-ha-neun dong-an jeo-neun eu-ma-geul deut-go i-sseo-sseo-yo.
Translation: While my friend was driving, I was listening to music.
Corresponds to Japanese 「友達が運転している間、私は音楽を聴いていました」. Listening to music largely overlaps with the time the friend is driving, so 「間」 is used. - Example: 아이가 자는 동안 비가 계속 내리고 있었어요.
Romanization: a-i-ga ja-neun dong-an bi-ga gye-sok nae-ri-go i-sseo-sseo-yo.
Translation: While the child was sleeping, it kept raining.
Corresponds to Japanese 「子どもが寝ている間、雨がずっと降っていました」. The rain is a continuing state in the second clause, not a single event occurring within the period.
◆ Similar Grammar ②: Korean 「-는 동안에」
「-는 동안에」 likewise indicates the period during which an action continues, but with 「에」 added, it is easier to interpret the second clause as something that occurs or is completed within that period, so it often corresponds to Japanese 「間に」. However, 「에」 is not obligatory in Korean, and many sentences remain natural as 「동안」, so Japanese usage cannot be determined only by whether Korean includes 「에」.
- Example: 엄마가 요리하는 동안에 숙제를 끝냈어요.
Romanization: eom-ma-ga yo-ri-ha-neun dong-an-e suk-je-reul kkeun-nae-sseo-yo.
Translation: I finished my homework while my mother was cooking.
Corresponds to Japanese 「母が料理をしている間に、宿題を終わらせました」. The second clause emphasizes that the homework was completed within the period, so Japanese uses 「間に」. - Example: 회의하는 동안에 전화가 왔어요.
Romanization: hoe-ui-ha-neun dong-an-e jeon-hwa-ga wa-sseo-yo.
Translation: I received a phone call during the meeting.
Corresponds to Japanese 「会議をしている間に、電話がかかってきました」. The phone call is an event occurring during the meeting and does not continue throughout the whole meeting. - Example: 집을 비운 동안에 택배가 도착했어요.
Romanization: ji-beul bi-un dong-an-e taek-bae-ga do-chak-hae-sseo-yo.
Translation: A package arrived while the house was empty.
Corresponds to Japanese 「留守の間に、荷物が届きました」. Being away creates a period, while the package arrival is an event occurring within it, so Japanese uses 「間に」. Korean uses 「비운 동안」 here because 「집을 비우다」 describes the established state of being away from home; not every sentence is fixed in the form 「-는 동안」.
◆ Core Differences From 「間／間に」:
Japanese usually uses 「間」 and 「間に」 to distinguish how the second clause relates to the time range. If the second clause continues or repeats during the period in the first clause, 「間」 is normally used. If the second clause occurs, is completed, or produces a result within the period, 「間に」 is usually used. Korean 「동안」 and 「동안에」 can show a similar tendency, but the particle 「에」 is easier to omit. Therefore, you cannot mechanically translate 「동안」 as 「間」 and 「동안에」 as 「間に」. When converting between the two languages, first check whether the second clause describes activity continuing throughout the period or something occurring or being completed within it.
The difference between 「間」 and 「間に」 does not need to be memorized through rigid categories such as “continuous verbs,” “instantaneous verbs,” or “one time versus many times.” The first clause simply marks out a time range, and what really determines the choice is how the second clause fits into that period. If the second clause is treated as an action or state continuing throughout the period, 「間」 is usually more natural. If something is completed, an event occurs, or even several events happen within that period, 「間に」 is more likely. When the sentence contains the idea of “before this changes” or “while this is still possible,” compare 「うちに」 as well. This is more reliable than judging from the translation alone.
FAQ
「間」 indicates that the second clause continues together with the preceding period, while 「間に」 means that the second event occurs, is completed, or becomes established within that period. For example, 「子どもが寝ている間、本を読んでいた」 means you kept reading while the child was sleeping, while 「子どもが寝ている間に、本を一冊読んだ」 means you finished one book during that period.
No. 「間に」 can describe one event or multiple events. The important point is that all of them fall within the specified period. For example, 「夏休みの間に三回映画館へ行った」 is completely natural. 「間に」 should not be memorized as a marker for only one point on a timeline.
No. Actions such as 「夕食を作る」 and 「本を一冊読む」 take time, but they can still use 「間に」 as long as the whole action is completed within the period established by the first clause. What should usually be avoided is a second clause that clearly describes continuous action throughout the entire period, such as 「ずっと見ていた」. In that case, 「間」 is generally used.
When you mean “before I forget” or “before it gets dark,” 「忘れないうちに」 and 「暗くならないうちに」 are usually more natural. 「うちに」 carries the sense that the current state may change. However, expressions such as 「知らない間に」 and 「会わない間に」 do exist when the negative state itself continues for a period of time, so not every 「Vない＋間に」 should be treated as incorrect.
「日本にいる間に」 mainly means that something will be completed during the period of staying in Japan. 「日本にいるうちに」 more easily carries the sense that it may become inconvenient once the speaker leaves Japan, so they want to do it while they still can. Both sentences are possible, but 「うちに」 adds greater awareness that the current state will eventually change.