目錄
Korean “-(으)ㄹ 때” and “-면서” are easy to memorize together as “when…”. When you see “집에 갈 때” and “집에 가면서,” the English translations may even look very similar, but Korean focuses on different things. “갈 때” simply frames the period of going home, and buying something, rain, or meeting a friend can all happen within that time. “가면서,” on the other hand, keeps the action of going home in progress while another action happens at the same time.
So “집에 갈 때 우유를 샀어요” can mean that the speaker stopped somewhere on the way home to buy milk, while “집에 가면서 친구와 통화했어요” means the person was still on the way home while also talking on the phone. Understanding the difference through everyday situations is much more useful than memorizing both as “when…”. It also makes it easier to understand what part of the timeline a sentence is describing when you later encounter forms such as “갔을 때,” “-자마자,” and “-는 동안.”
What’s the Difference Between Korean “-(으)ㄹ 때” and “-면서”? Start with Time Background vs. Simultaneous Actions
“-(으)ㄹ 때” consists of the dependent noun “때” and the adnominal form that comes before it, and means “when…” or “at the time when…”. It can describe everyday habits, the time when a particular event occurred, and past situations with “-았/었을 때.”
“-면서,” by contrast, is a connective ending. Its most typical function is to link two actions or states occurring at the same time. For example, “음악을 들으면서 공부해요” means “I study while listening to music.” “-면서” also has a contrastive use and can express a mismatch similar to “even though…” or “despite…”.
The biggest difference is where the focus lies. “-(으)ㄹ 때” first establishes a time background, and the following event only needs to occur within that time range. “-면서” more directly places the two actions in the same ongoing time frame.
- Example: 집에 갈 때 우유를 샀어요.
Romanization: ji-be gal ttae u-yu-reul sa-sseo-yo.
Translation: I bought milk on the way home.
“갈 때” first establishes the time background of going home, and buying milk is an event that happened within that period. - Example: 집에 가면서 친구와 통화했어요.
Romanization: ji-be ga-myeon-seo chin-gu-wa tong-hwa-hae-sseo-yo.
Translation: I talked to a friend on the phone while going home.
Going home and talking on the phone happened during the same period, so “-면서” is used. - Example: 어릴 때 이 동네에 살았어요.
Romanization: eo-ril ttae i dong-ne-e sa-rat-sseo-yo.
Translation: I lived in this neighborhood when I was young.
“어릴 때” treats childhood as a time background and has nothing to do with two actions occurring simultaneously.
Korean “-(으)ㄹ 때” and “-면서” Conjugation Rules: Final Consonants, Parts of Speech, and Form Changes
The “-(으)ㄹ” before “때” changes according to whether the stem has a final consonant. If the stem has a final consonant other than “ㄹ,” use “-을 때.” If there is no final consonant or the stem ends in “ㄹ,” use “-ㄹ 때.” Both verbs and adjectives can use this form, while nouns use “N일 때.”
“-면서” also has two forms. If the stem has a final consonant other than “ㄹ,” attach “-으면서.” If there is no final consonant or the stem ends in “ㄹ,” attach “-면서.” When a noun expresses a relationship such as “being both A and B,” use “N이면서.”
| Item | Connection | Example | Meaning |
|---|---|---|---|
| Verb＋“-(으)ㄹ 때” | Stem＋(으)ㄹ 때 | 먹을 때／갈 때 | When eating／when going |
| Adjective＋“-(으)ㄹ 때” | Stem＋(으)ㄹ 때 | 바쁠 때 | When busy |
| Past situation＋“때” | Stem＋았/었을 때 | 갔을 때 | When one went／had gone |
| Noun＋“때” | Noun＋일 때 | 학생일 때 | When one is a student |
| No final consonant＋“-면서” | Stem＋면서 | 가면서 | While going |
| ㄹ-final＋“-면서” | Stem＋면서 | 살면서 | While living／during life |
| Other final consonant＋“-으면서” | Stem＋으면서 | 먹으면서 | While eating |
| Noun＋“-면서” | Noun＋이면서 | 학생이면서 | While being a student／both a student and… |
“-(으)ㄹ 때” Conjugation Rules｜Use “-을 때” After a Final Consonant and “-ㄹ 때” After No Final Consonant or ㄹ
The stem “먹-” in “먹다” ends in a final consonant, so it becomes “먹을 때.” “가다” has no final consonant, so it becomes “갈 때.” Although “살다” ends in “ㄹ,” it becomes “살 때,” not “살을 때.”
Adjectives use the same pattern, such as “바쁘다→바쁠 때,” “좋다→좋을 때,” and “멀다→멀 때.”
- Example: 밥을 먹을 때 휴대폰을 보지 않아요.
Romanization: ba-beul meo-geul ttae hyu-dae-pon-eul bo-ji a-na-yo.
Translation: I don’t look at my phone while eating.
“먹다” has a final consonant, so it becomes “먹을 때.” - Example: 날씨가 좋을 때 산책해요.
Romanization: nal-ssi-ga jo-eul ttae san-chaek-hae-yo.
Translation: I go for a walk when the weather is nice.
The adjective “좋다” can also take “-(으)ㄹ 때,” setting a certain state as the time background. - Example: 바쁠 때는 점심을 간단히 먹어요.
Romanization: ba-ppeul ttae-neun jeom-si-meul gan-dan-hi meo-geo-yo.
Translation: When I’m busy, I keep lunch simple.
“바쁘다” becomes “바쁠 때,” describing times when the speaker is in a busy state.
“-면서” Conjugation Rules｜How “가면서,” “먹으면서,” and “살면서” Are Formed
When there is no final consonant, attach “-면서” directly, as in “가다→가면서” and “공부하다→공부하면서.” Stems with an ordinary final consonant take “-으면서,” as in “먹다→먹으면서” and “읽다→읽으면서.”
If the stem ends in “ㄹ,” attach “-면서” directly, as in “살다→살면서” and “놀다→놀면서.”
- Example: 음악을 들으면서 운동해요.
Romanization: eu-mak-eul deu-reu-myeon-seo un-dong-hae-yo.
Translation: I exercise while listening to music.
When “듣다” takes “-으면서,” the irregular conjugation produces “들으면서.” - Example: 커피를 마시면서 이야기했어요.
Romanization: keo-pi-reul ma-si-myeon-seo i-ya-gi-hae-sseo-yo.
Translation: We talked while drinking coffee.
“마시다” has no final consonant, so “-면서” attaches directly. - Example: 서울에 살면서 한국어를 배웠어요.
Romanization: seo-u-re sal-myeon-seo han-gu-geo-reul bae-wo-sseo-yo.
Translation: I learned Korean while living in Seoul.
“살다” ends in “ㄹ,” so it forms “살면서.”
Korean “-(으)ㄹ 때” Usage: General Time, Past Situations, and Noun Forms
Although “-(으)ㄹ 때” contains “-(으)ㄹ,” it should not simply be memorized as a future-tense form. Expressions such as “갈 때,” “먹을 때,” and “만날 때” commonly appear in descriptions of habitual actions, past events, and future arrangements. The time of the whole sentence must be determined together with the tense of the following clause, time adverbs, and the surrounding context.
For example, “학교에 갈 때 음악을 들어요” describes an everyday habit, while “어제 학교에 갈 때 친구를 만났어요” looks back on yesterday. Both use “갈 때,” and the first clause does not automatically change to “갔을 때” just because the whole sentence refers to the past.
“-(으)ㄹ 때” Usage｜Expressing General Habits or the Time When an Action Occurs
“갈 때” often treats “going” as an unfinished process, such as preparing to leave, being on the way, or before arriving. “먹을 때” usually refers to while eating, about to eat, or whenever one eats.
The more important point with “-(으)ㄹ 때” is the relative relationship between the event in the first clause and the event in the second, rather than labeling “-(으)ㄹ” as simply “future.”
- Example: 학교에 갈 때 항상 음악을 들어요.
Romanization: hak-gyo-e gal ttae hang-sang eu-mak-eul deu-reo-yo.
Translation: I always listen to music when I go to school.
The second clause describes an everyday habit, so “갈 때” refers to the recurring commuting period. - Example: 어제 회사에 갈 때 비가 많이 왔어요.
Romanization: eo-je hoe-sa-e gal ttae bi-ga man-i wa-sseo-yo.
Translation: It rained heavily when I was going to work yesterday.
Even though the whole event happened yesterday, the first clause can still use “갈 때.” - Example: 사진을 찍을 때 플래시를 끄세요.
Romanization: sa-jin-eul jji-geul ttae peul-lae-si-reul kkeu-se-yo.
Translation: Turn off the flash when taking pictures.
This is an instruction that applies whenever taking a photo, not a prediction about one future event.
“-았/었을 때” Usage｜Past Situations or Cases Where the First Event Has Already Occurred
“-았/었을 때” treats the preceding action as something that has already happened and uses that event as a time reference. However, it should not mechanically be translated as “after doing…,” because the actual sequence still depends on the verb and the context.
“학교에 갈 때 친구를 만났어요” is naturally understood as meeting a friend on the way to school. “학교에 갔을 때 선생님이 안 계셨어요,” on the other hand, treats going to school as an already-established event and then describes the situation at that time.
- Example: 한국에 갔을 때 한복을 입어 봤어요.
Romanization: han-gu-ge ga-sseul ttae han-bo-geul i-beo bwa-sseo-yo.
Translation: I tried wearing hanbok when I went to Korea.
“갔을 때” looks back on the experience of having gone to Korea and does not mean “immediately after arriving in Korea.” - Example: 집에 도착했을 때 아무도 없었어요.
Romanization: ji-be do-chak-hae-sseul ttae a-mu-do eop-sseo-sseo-yo.
Translation: There was nobody home when I arrived.
The arrival has already been established, and the sentence describes the state observed at that time. - Example: 처음 만났을 때는 서로 말이 별로 없었어요.
Romanization: cheo-eum man-na-sseul ttae-neun seo-ro ma-ri byeol-lo eop-sseo-sseo-yo.
Translation: When we first met, neither of us talked much.
“만났을 때” looks back on the occasion of the first meeting rather than meaning that the meeting had completely ended beforehand.
How Do “N일 때” and “N이었을 때” Differ? Noun-Based Time Expressions
When nouns combine with “때,” present or general identities use “N일 때,” while past identities can use “N이었을 때／였을 때.”
“학생일 때” can describe a general condition, such as “when one is a student…”.
“학생이었을 때” explicitly places the student status in the past.
- Example: 학생일 때는 할인을 받을 수 있어요.
Romanization: hak-saeng-il ttae-neun ha-rin-eul ba-deul su i-sseo-yo.
Translation: You can get a discount when you are a student.
“학생일 때” describes the general condition of having student status. - Example: 학생이었을 때 매일 도서관에 갔어요.
Romanization: hak-saeng-i-eo-sseul ttae mae-il do-seo-gwan-e ga-sseo-yo.
Translation: When I was a student, I went to the library every day.
“학생이었을 때” explicitly looks back on a past period when the speaker was a student. - Example: 대학생이었을 때 처음 해외여행을 했어요.
Romanization: dae-hak-saeng-i-eo-sseul ttae cheo-eum hae-oe-yeo-haeng-eul hae-sseo-yo.
Translation: I traveled abroad for the first time when I was a university student.
Being a university student is a completed past identity, so “이었을 때” is used.
Three Main Uses of Korean “-(으)ㄹ 때” and “-면서”: Time Background, Simultaneity, and “Even Though…”
Once “-(으)ㄹ 때” and “-면서” are properly separated, three very different types of sentences become clear. “-(으)ㄹ 때” answers “when?”, the basic use of “-면서” answers “what is happening at the same time?”, and “-면서” can also use the coexistence of two facts to express a contrast similar to “even though…”.
“-(으)ㄹ 때” Usage｜Setting the Time Point or Background for an Event
The most important function of “-(으)ㄹ 때” is to establish time. The following clause can be an action, state, habit, command, or suggestion, and the two parts do not need to remain synchronized from beginning to end.
So when the sentence is answering “when does this happen?”, “-(으)ㄹ 때” is usually the most basic choice.
- Example: 사진을 찍을 때 플래시를 끄세요.
Romanization: sa-jin-eul jji-geul ttae peul-lae-si-reul kkeu-se-yo.
Translation: Turn off the flash when taking pictures.
Taking a photo simply establishes when the instruction applies. “Taking a photo” and “turning off the flash” do not need to be treated as two continuously simultaneous actions. - Example: 친구를 만날 때마다 새로운 카페에 가요.
Romanization: chin-gu-reul man-nal ttae-ma-da sae-ro-un ka-pe-e ga-yo.
Translation: Every time I meet my friend, we go to a new café.
“때마다” means that the following event occurs whenever a certain time or situation comes up. - Example: 어렸을 때 할머니가 자주 이야기를 들려주셨어요.
Romanization: eo-ryeo-sseul ttae hal-meo-ni-ga ja-ju i-ya-gi-reul deul-lyeo-ju-syeo-sseo-yo.
Translation: When I was young, my grandmother often told me stories.
Childhood is a broad time background, and the second clause describes something that repeatedly happened during that period.
“-면서” Usage ①｜Two Actions or States Occurring at the Same Time
The most typical meaning of “-면서” is “while…” or “while doing A, do B.” The two events need to overlap in time, such as listening to music and studying, walking and talking on the phone, or drinking coffee and chatting.
When both clauses describe actions actively carried out by a person, the most typical sentence has the same agent performing both actions. This is a useful rule of thumb for beginner conversation, but it should not be expanded into an absolute rule with no exceptions for every “-면서” sentence.
- Example: 음악을 들으면서 공부해요.
Romanization: eu-mak-eul deu-reu-myeon-seo gong-bu-hae-yo.
Translation: I study while listening to music.
Listening to music and studying continue during the same period. - Example: 친구와 걸으면서 이야기했어요.
Romanization: chin-gu-wa geo-reu-myeon-seo i-ya-gi-hae-sseo-yo.
Translation: I talked with my friend while walking.
Walking and talking naturally overlap, so “-면서” is used. - Example: 커피를 마시면서 책을 읽었어요.
Romanization: keo-pi-reul ma-si-myeon-seo chae-geul il-geo-sseo-yo.
Translation: I read a book while drinking coffee.
Drinking coffee and reading can both continue during the same period.
“-면서” Usage ②｜Expressing Contrast: “Even Though…”
“-면서” can also connect two facts or attitudes that do not match each other. In this use, it is usually not translated as “while…” but instead as “even though…” or “despite…”.
These sentences often express dissatisfaction, criticism, doubt, or surprise, such as someone knowingly doing something anyway or claiming to be busy while continuing to watch videos. Adding “-도” to form “-면서도” makes the contrast even clearer.
- Example: 알면서 왜 그렇게 말했어요?
Romanization: al-myeon-seo wae geu-reo-ke mal-hae-sseo-yo?
Translation: If you knew, why did you say that?／Why did you say that even though you knew?
Knowing something and then acting inconsistently with that knowledge creates a blaming tone. - Example: 바쁘다고 하면서 계속 영상을 보고 있어요.
Romanization: ba-ppeu-da-go ha-myeon-seo gye-sok yeong-sang-eul bo-go i-sseo-yo.
Translation: You say you’re busy, but you keep watching videos.
What the person says and what they do are in contrast, so the focus is no longer simple simultaneity. - Example: 돈도 없으면서 새 가방을 샀어요.
Romanization: don-do eop-sseu-myeon-seo sae ga-bang-eul sa-sseo-yo.
Translation: Even though they had no money, they bought a new bag.
“돈도 없으면서” expresses the speaker’s judgment that the lack of money and the purchase are inconsistent.
What’s the Difference Between Korean “-(으)ㄹ 때” and “-면서”? Time Background Is Not the Same as Simultaneous Action
“-(으)ㄹ 때” and “-면서” are easy to confuse because both can sometimes be translated with “when…” in English. In reality, “-(으)ㄹ 때” only needs to establish a time range, while the simultaneous use of “-면서” requires the events to genuinely overlap in time.
| Comparison | “-(으)ㄹ 때” | “-면서” |
|---|---|---|
| Core function | Establish time background | Two things occur simultaneously |
| Common English | when… | while… |
| Requires time overlap? | Not necessarily complete overlap | Basic simultaneous use requires overlap |
| Subjects in clauses | Can differ | Typical dual-action use often shares the same agent |
| Can express contrast? | Generally no | Yes |
| Typical example | 갈 때 연락해요 | 가면서 전화해요 |
▌Difference Between “갈 때” and “가면서”｜Setting the Time of Going vs. Doing Something While Going
“갈 때” simply means “when going” and does not require the following action to occur continuously throughout the whole action of going. “가면서,” however, places the following action inside the ongoing movement.
집에 갈 때 우유를 샀어요.
I bought milk on the way home.
집에 가면서 친구와 통화했어요.
I talked to a friend on the phone while going home.
The first sentence only says that buying milk happened during the period of going home and could involve stopping in a store along the way. The second directly treats going home and talking on the phone as simultaneous actions.
▌Can “-면서” Have Different Subjects? Subject Restrictions in the Simultaneous Use
In the most typical “while doing A, do B” sentence, it is most natural for the same person to perform both actions.
민지 씨가 음악을 들으면서 공부해요.
Minji studies while listening to music.
If you want to say that one person listens to music while a different person studies, the focus has changed: one person’s action is now serving as the time background for another event. In that case, “-는 동안” is usually clearer.
민지 씨가 음악을 듣는 동안 저는 공부했어요.
I studied while Minji was listening to music.
For beginners, it is useful to treat “-면서＝simultaneous actions by the same agent” as an initial guideline and handle more complex states, event developments, and contrastive sentences separately.
What’s the Difference Between Korean “-(으)ㄹ 때,” “-면서,” “-자마자,” and “-는 동안”?
Korean has more time expressions than just “-(으)ㄹ 때” and “-면서.” “-자마자” means that the next event happens immediately after the first one ends, while “-는 동안” frames an entire continuing period of time.
| Pattern | Core Relationship | Time Image | Example |
|---|---|---|---|
| “-(으)ㄹ 때” | Time background | B happens when A | 갈 때 연락해요 |
| “-면서” | Simultaneous actions | A and B overlap | 가면서 전화해요 |
| “-자마자” | Immediate sequence | As soon as A ends, B | 도착하자마자 전화해요 |
| “-는 동안” | Continuing period | B happens during the whole period of A | 기다리는 동안 읽어요 |
▌Difference Between “-(으)ㄹ 때” and “-자마자”｜Does It Emphasize “Immediately”?
“-(으)ㄹ 때” only specifies a time and does not indicate that there is absolutely no gap between the two events. “-자마자,” on the other hand, explicitly means that as soon as the first event is completed, the next one happens immediately.
- Example: 집에 도착했을 때 가족에게 연락했어요.
Romanization: ji-be do-chak-hae-sseul ttae ga-jo-ge-ge yeon-rak-hae-sseo-yo.
Translation: I contacted my family when I got home.
This only says that the contact happened around the time of arrival and does not especially emphasize speed. - Example: 집에 도착하자마자 가족에게 연락했어요.
Romanization: ji-be do-chak-ha-ja-ma-ja ga-jo-ge-ge yeon-rak-hae-sseo-yo.
Translation: I contacted my family as soon as I got home.
“-자마자” connects arrival directly to contacting the family, with almost no time gap. - Example: 수업이 끝나자마자 집에 갔어요.
Romanization: su-eo-bi kkeut-na-ja-ma-ja ji-be ga-sseo-yo.
Translation: I went home as soon as class ended.
Class ends first, and going home begins immediately afterward, so this differs from simultaneous “-면서.”
▌Difference Between “-면서” and “-고”｜Simultaneous Actions vs. Simply Connecting Two Events
“-고” can simply list two events and can also imply sequence depending on the sentence. “-면서,” by contrast, explicitly builds simultaneity into the ending.
- Example: 저녁을 먹고 숙제를 했어요.
Romanization: jeo-nyeo-geul meok-go suk-je-reul hae-sseo-yo.
Translation: I ate dinner and then did my homework.
This is naturally understood as eating first and doing homework afterward. - Example: 저녁을 먹으면서 뉴스를 봤어요.
Romanization: jeo-nyeo-geul meo-geu-myeon-seo nyu-seu-reul bwa-sseo-yo.
Translation: I watched the news while eating dinner.
Eating dinner and watching the news overlap in time, so “-면서” is used. - Example: 카페에 가고 친구를 만났어요.
Romanization: ka-pe-e ga-go chin-gu-reul man-na-sseo-yo.
Translation: I went to a café and then met a friend.
“-고” only needs to connect the two events and does not require them to be simultaneous like “-면서.”
▌Difference Between “-(으)ㄹ 때” and “-는 동안”｜A Time Point or Situation vs. an Entire Period
“-(으)ㄹ 때” can refer to a particular time or broadly to a certain situation, while “-는 동안” more explicitly frames a continuing period as the time range.
- Example: 여행할 때 사진을 많이 찍어요.
Romanization: yeo-haeng-hal ttae sa-jin-eul man-i jji-geo-yo.
Translation: I take a lot of photos when I travel.
“여행할 때” simply uses traveling as a general time background. - Example: 여행하는 동안 매일 일기를 썼어요.
Romanization: yeo-haeng-ha-neun dong-an mae-il il-gi-reul sseo-sseo-yo.
Translation: I wrote in my diary every day during the trip.
“-는 동안” frames the entire duration of the trip. - Example: 기다리는 동안 책을 읽었어요.
Romanization: gi-da-ri-neun dong-an chae-geul il-geo-sseo-yo.
Translation: I read a book while I was waiting.
Waiting is a continuing period, and reading happened within that interval.
Comparing Korean “-(으)ㄹ 때” and “-면서” in the Same Situation
“-(으)ㄹ 때” and “-면서” can sometimes appear in very similar everyday situations, but they focus on different things. “-(으)ㄹ 때” is more like first explaining “when does this happen?”, with the first action serving as the time background for the second. “-면서” places both actions together and makes the listener picture them happening at the same time.
For example, both can be used in situations involving studying and listening to music. “음악을 들을 때 공부해요” says that studying usually happens when the speaker listens to music, so the focus is closer to a habit. “음악을 들으면서 공부해요,” by contrast, creates the image of the music playing while the person is actively studying, with both actions continuing together. Both may be translated as “I study while listening to music,” but what changes in Korean is whether the speaker wants to explain when something happens or what two things are happening at the same time.
- Example: 음악을 들을 때 공부해요.
Romanization: eu-mak-eul deu-reul ttae gong-bu-hae-yo.
Translation: I study when I listen to music.
“들을 때” treats listening to music as the time background for studying and sounds more like a statement about when the speaker normally studies. - Example: 음악을 들으면서 공부해요.
Romanization: eu-mak-eul deu-reu-myeon-seo gong-bu-hae-yo.
Translation: I study while listening to music.
“들으면서” directly indicates that listening to music and studying happen at the same time, making the overlap more explicit.
The same distinction can be seen in commuting situations. “지하철을 탈 때 뉴스를 봐요” sounds more like saying that watching the news is a habit that occurs when taking the subway. “지하철을 타면서 뉴스를 봐요” places taking the subway and watching the news within the same period and explicitly presents them as simultaneous.
- Example: 지하철을 탈 때 뉴스를 봐요.
Romanization: ji-ha-cheo-reul tal ttae nyu-seu-reul bwa-yo.
Translation: I watch the news when I take the subway.
“탈 때” answers “when do you watch the news?”, with taking the subway serving as the time background. - Example: 지하철을 타면서 뉴스를 봐요.
Romanization: ji-ha-cheo-reul ta-myeon-seo nyu-seu-reul bwa-yo.
Translation: I watch the news while riding the subway.
“타면서” more directly describes watching the news while riding, with both actions occurring at the same time.
Common Mistakes with Korean “-(으)ㄹ 때” and “-면서”: How to Judge Tense and Simultaneity
Many mistakes with “-(으)ㄹ 때” and “-면서” come from first translating the sentence into “when…” and then choosing either grammar pattern arbitrarily. In practice, it is easier to choose correctly if you first check whether the first event is completed, whether the two events overlap, and whether the sentence carries a contrastive meaning.
▌Mistake ①｜Assuming “-(으)ㄹ” Always Means Future
“학교에 갈 때 음악을 들어요” does not necessarily mean “I will listen to music when I go to school in the future.” It can simply describe an everyday commuting habit.
❌ “갈 때”＝future only
✅ “갈 때”＝depending on context, can describe habits, past situations, or future situations
The tense of the whole sentence cannot be determined from the single “ㄹ” inside “-(으)ㄹ 때.”
▌Mistake ②｜Translating Every “-았/었을 때” as “After Doing…”
“갔을 때,” “먹었을 때,” and “만났을 때” all treat the preceding event as something that has happened, but they should not automatically be translated as “after doing…”.
한국에 갔을 때 한복을 입었어요.
I wore hanbok when I went to Korea.
This sentence looks back on the experience of going to Korea. It does not mean that the speaker wore hanbok only after the entire Korea trip had ended.
▌Mistake ③｜Using “-면서” When the Actions Are Not Simultaneous
The basic simultaneous use of “-면서” requires the two events to overlap in time. If one action clearly finishes before the other begins, another connective form should be used.
❌ 일어나면서 이를 닦았어요.
✅ 일어나서 이를 닦았어요.
If the intended meaning is “I brushed my teeth after getting up,” then getting up and brushing one’s teeth are sequential actions, so “-아/어서” is more natural.
▌Mistake ④｜Always Translating “-면서” as “While…”
“-면서” can also express contrast.
알면서 왜 그랬어요?
Why did you do that even though you knew?
There is no need to translate this literally as “while knowing, why did you do that?” The real meaning is that the person knew something, but their action was inconsistent with that knowledge.
Korean “-(으)ㄹ 때” and “-면서” in Everyday Conversation: Three Practical Situations for Commuting, Work, and Travel
“-(으)ㄹ 때” commonly appears when asking about habits, explaining time, or arranging events. “-면서” works especially well for describing what someone does simultaneously while commuting, handling tasks at work, or walking around during a trip.
▌Situation ①｜What Do You Usually Do While Commuting?
A：출근할 때 보통 뭐 해요?
chul-geun-hal ttae bo-tong mwo hae-yo?
What do you usually do during your commute?
B：지하철을 타면서 팟캐스트를 들어요.
ji-ha-cheo-reul ta-myeon-seo pat-kae-seu-teu-reul deu-reo-yo.
I listen to podcasts while riding the subway.
📌 Grammar Point: A’s “출근할 때” simply sets the commuting period, and the answer can describe any commuting habit. B’s “타면서” explicitly places riding the subway and listening to podcasts in the same time frame.
▌Situation ②｜Arranging Materials and Slides During a Meeting
A：회의를 시작할 때 자료를 나눠 줄까요?
hoe-ui-reul si-jak-hal ttae ja-ryo-reul na-nwo jul-kka-yo?
Should we hand out the materials when the meeting starts?
B：네, 그리고 설명하면서 화면도 보여 주세요.
ne, geu-ri-go seol-myeong-ha-myeon-seo hwa-myeon-do bo-yeo ju-se-yo.
Yes, and please show the screen while explaining as well.
📌 Grammar Point: Handing out the materials is scheduled at the time when the meeting starts, so “-(으)ㄹ 때” is used. Explaining and showing the screen can happen at the same time, so “-면서” is used.
▌Situation ③｜Looking for Sights While Walking During a Trip
A：여행할 때 사진을 많이 찍어요?
yeo-haeng-hal ttae sa-jin-eul man-i jji-geo-yo?
Do you take a lot of photos when you travel?
B：네, 걸으면서 예쁜 곳을 찾는 편이에요.
ne, geo-reu-myeon-seo ye-ppeun go-seul chat-neun pyeon-i-e-yo.
Yes, I usually look for nice places while walking around.
📌 Grammar Point: “여행할 때” treats the trip as an overall time background, while “걸으면서” makes walking and looking for places happen simultaneously.
Cultural Notes:
- “때” has a very broad range of use in everyday Korean. Expressions such as “어릴 때,” “시간이 있을 때,” “한국에 갈 때,” and “처음 만났을 때” are all extremely common. For this reason, when you see “-(으)ㄹ,” it is better not to interpret it as future tense first, but to read the entire “때” construction as one unit.
- The simultaneous use of “-면서” does not require both actions to overlap every single second. For example, “한국에서 살면서 많은 사람을 만났어요” means “I met many people while living in Korea.” Of course, the moment of meeting each person did not cover the entire period of living in Korea, but all of those meetings occurred within the larger ongoing process.
- When “-면서” appears in forms such as “알면서,” “그러면서,” and “없으면서,” it can easily carry a sense of criticism or contrast. Memorizing it only as “while doing…” will cause you to miss another very common use in everyday conversation.
How Do Korean “-(으)ㄹ 때” and “-면서” Compare with Japanese “〜とき” and “〜ながら”?
Korean “-(으)ㄹ 때” is closest to Japanese “〜とき,” as both can first establish a time background. Korean “집에 갈 때” can correspond to Japanese “家に帰るとき,” while “집에 갔을 때” can correspond to “家に帰ったとき.” In both languages, you need to look at what stage the first event has reached when the second event occurs.
The simultaneous use of Korean “-면서” is quite close to Japanese “〜ながら.” “음악을 들으면서 공부해요” can be expressed as “音楽を聞きながら勉強します,” with the same person performing two actions at the same time.
◆ Similar Grammar ①: Japanese “〜とき”
“〜とき” establishes the time when an action, state, or identity applies and is very close in function to Korean “-(으)ㄹ 때.” Japanese also uses the verb form before “とき” to express the temporal relationship between the first and second events.
- Example: 学校に行くとき、コンビニに寄ります。
Kana: がっこうにいくとき、こんびにによります。
Translation: I stop by a convenience store when I go to school.
“行くとき” first uses going to school as the time background, functioning similarly to Korean “학교에 갈 때.” - Example: 日本に行ったとき、京都を旅行しました。
Kana: にほんにいったとき、きょうとをりょこうしました。
Translation: When I went to Japan, I traveled to Kyoto.
“行ったとき” looks back on a trip to Japan that already happened, functioning similarly to Korean “일본에 갔을 때.” - Example: 子どものとき、よくこの公園で遊びました。
Kana: こどものとき、よくこのこうえんであそびました。
Translation: When I was a child, I often played in this park.
“子どものとき” uses childhood as a time background, just like Korean “어릴 때,” without requiring two simultaneous actions.
◆ Similar Grammar ②: Japanese “〜ながら”
“〜ながら” most commonly means that the same subject performs two actions at the same time, making it very close to the simultaneous use of Korean “-면서.” The first action normally continues while the second takes place during the same period.
- Example: 音楽を聞きながら勉強します。
Kana: おんがくをききながらべんきょうします。
Translation: I study while listening to music.
“音楽を聞く” and “勉強する” happen simultaneously, closely matching Korean “음악을 들으면서 공부해요.” - Example: 歩きながら友達と話しました。
Kana: あるきながらともだちとはなしました。
Translation: I talked to my friend while walking.
Walking and talking can both continue during the same period, so Japanese uses “〜ながら,” while Korean can use “-면서.” - Example: コーヒーを飲みながら本を読みました。
Kana: こーひーをのみながらほんをよみました。
Translation: I read a book while drinking coffee.
Drinking coffee and reading overlap in time. In Korean, this can be expressed as “커피를 마시면서 책을 읽었어요.”
◆ Core Differences from “-(으)ㄹ 때” and “-면서”:
Korean “-(으)ㄹ 때” and Japanese “〜とき,” and Korean “-면서” and Japanese “〜ながら,” are very close in their basic functions, but they cannot always be translated word for word. In particular, Korean “-면서” is also commonly used for contrasts meaning “even though…”. Japanese may use “〜ながら” or “〜ながらも” in some of these cases, but it may also use another concessive or contrastive expression depending on the nuance of the whole sentence.
“-(으)ㄹ 때” and “-면서” both look related to time, but once they are placed into actual sentences, the difference is clear. “-(으)ㄹ 때” explains when something happens, and the two actions do not need to remain simultaneous throughout. “-면서,” by contrast, places two events in the same ongoing process, as in “집에 가면서 친구와 통화했어요,” where going home and talking on the phone genuinely happen at the same time.
As for “갈 때” and “갔을 때,” there is also no need to determine tense solely from “ㄹ” or “았／었.” Whether the sentence describes a habit, a memory, or an event that has already occurred becomes much clearer when you look at the surrounding context. When you later encounter time expressions such as “-자마자” and “-는 동안,” you can directly compare whether the events are simultaneous, happen within a broader duration, or occur immediately one after another, which makes choosing the right form much more natural.
FAQ
Sometimes both may be translated using “when…” in English, but they are not interchangeable. “-(으)ㄹ 때” establishes a time background, while the basic function of “-면서” places two actions or states in the same time frame. The key is to check whether the second event simply occurs during that period or genuinely overlaps with the first action.
Not necessarily. “갈 때” can appear in habitual actions, past experiences, and future plans. For example, “학교에 갈 때 음악을 들어요” describes an everyday habit, while “어제 학교에 갈 때 비가 왔어요” looks back on the past. The time of the whole sentence must be interpreted together with the tense of the following clause and the context.
“갈 때” often treats “going” as an unfinished or unfolding process, while “갔을 때” treats the act of going as an event that has already taken place. For example, “학교에 갈 때 친구를 만났어요” is naturally understood as meeting a friend on the way to school, while “학교에 갔을 때 선생님이 안 계셨어요” describes the situation observed after going to school.
In the typical “while doing A, do B” use, the same agent usually performs both actions, so beginners can use this as an initial guideline. However, actual Korean also has state-based, event-development, and contrastive “-면서” structures, so it should not be expanded into an absolute rule that different subjects are always impossible. If you simply want to say that something happened during another person’s action, “-는 동안” is usually clearer.
This sentence uses the contrastive function of “-면서.” “알면서 왜 그래요?” means “Why are you doing that even though you know?” The speaker sees the person’s knowledge and actual behavior as inconsistent, so the sentence expresses confusion or criticism rather than two physical actions occurring at the same time.