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The Japanese expression 「〜に決まっている」 shows that the speaker is extremely certain that something is the case. In Chinese, it is often translated as “definitely” or “of course.” In actual conversation, however, it expresses a stronger stance than a simple “definitely,” often carrying a sense of “Obviously, that’s the answer” or “Do you even need to ask?” For this reason, it is somewhat different from simply predicting that something will happen.

For example, 「無理に決まってる」 does not sound like a calm analysis of the chances of success. Instead, it directly asserts, “Of course that’s impossible.” Likewise, 「冗談に決まってる」 has the tone of “Of course it’s a joke.” The expression is very common among people who know each other well, especially when contradicting someone or making a teasing retort. In situations where politeness or room for uncertainty is needed, however, it can sound overly categorical. The sections below will look at its conjugation patterns and actual nuance, then compare it with 「〜に違いない」 and 「〜はずだ」 to show how these expressions differ even though they can all be translated into Chinese with words such as 「一定」.

How Is the Japanese 「〜に決まっている」 Used? The Strong Conviction Behind “Definitely”

「〜に決まっている」 is close in meaning to “definitely” or “of course,” and its core meaning is strong conviction. The speaker treats a particular conclusion as something that is almost beyond discussion, which makes the expression well suited to judgments, contradictions, and teasing retorts in everyday conversation. Although 「決まっている」 comes from 「決まる」, in this grammatical pattern it does not necessarily mean that something has literally or officially been decided. Instead, it is closer to “It must be so” or “Of course it is.”

This distinction is important. In 「そんな値段では無理に決まっている」, for example, 「無理」 has not been officially “decided” by anyone. Rather, the speaker is asserting, “There’s no way that could be done at that price.” If you also want to organize other common N3 patterns involving conjecture, judgment, and decisions, you can review them together with a general overview of N3 Japanese grammar.

How to Attach 「〜に決まっている」: Do Not Add 「だ」 After Nouns or Na-Adjectives

「〜に決まっている」 attaches to the plain form. Verbs and i-adjectives connect directly to it. With nouns and na-adjectives in the non-past affirmative, attach it directly to the noun or stem without 「だ」. Past forms can also be used, as in 「学生だったに決まっている」 and 「静かだったに決まっている」.

Word type	Pattern	Example
Verb	Plain form＋に決まっている	来るに決まっている
I-adjective	Plain form＋に決まっている	高いに決まっている
Na-adjective	Stem＋に決まっている	無理に決まっている
Noun	Noun＋に決まっている	冗談に決まっている
Past	Plain past form＋に決まっている	来たに決まっている／学生だったに決まっている

「無理だに決まっている」 and 「冗談だに決まっている」 are both unnatural. This differs from 「〜と思う」. When a noun is followed by 「〜と思う」, for example, you say 「冗談だと思う」. If you are practicing several judgment-related patterns together, you can also continue with how the Japanese expression 「と思う」 is used.

Uses of 「〜に決まっている」: Directly Asserting a Result and Using It for Contradictions or Retorts

Usage ① of 「〜に決まっている」｜Treating the Result as Obvious

This use of 「〜に決まっている」 is not about slowly analyzing probabilities. The speaker believes the answer is already obvious. The judgment may come from past experience, knowledge of a particular person, or an intuitive reaction to the circumstances at hand. The main point is not whether the evidence is complete, but whether the speaker is willing to state the conclusion this strongly.

• Example:  金曜日の夜だから、あの店は混んでいるに決まっている。
  Kana: きんようびのよるだから、あのみせはこんでいるにきまっている。
  Translation: It’s Friday night, so that restaurant is definitely crowded.
  The speaker treats Friday-night crowds as an obvious outcome. The tone is much stronger than 「混んでいると思う」.
• Example:  彼女なら、このデザインを選ぶに決まっている。
  Kana: かのじょなら、このデザインをえらぶにきまっている。
  Translation: If it’s her, she’s definitely going to choose this design.
  The judgment comes from knowing the person’s preferences and carries a sense of “You can tell without even asking.”
• Example:  あれだけ練習したんだから、本番もうまくいくに決まっている。
  Kana: あれだけれんしゅうしたんだから、ほんばんもうまくいくにきまっている。
  Translation: You practiced that much, so of course the real performance is going to go well too.
  There is a reason given beforehand, but the sentence ending is not a detached inference. It directly expresses strong confidence in a positive outcome and can also sound encouraging.

Usage ② of 「〜に決まっている」｜Strongly Contradicting Someone or Making a Retort

「〜に決まっている」 often appears in contradictions and teasing retorts because the pattern itself conveys a strong stance. In particular, when it is combined with words such as 「無理」, 「ダメ」, 「嘘」, or a negative form, it easily takes on the tone of “Isn’t that obvious?” This sounds natural between friends, but in the workplace, customer-service settings, or conversations where some room for uncertainty is needed, it can sound too forceful.

• Example:  今から出ても、終電には間に合わないに決まっている。
  Kana: いまからでても、しゅうでんにはまにあわないにきまっている。
  Translation: Even if we leave now, there’s no way we’ll make the last train.
  The speaker treats “not making it” as the conclusion itself. It works naturally when speaking with someone close and responding with strong confidence.
• Example:  そんな急なお願い、断られるに決まっているよ。
  Kana: そんなきゅうなおねがい、ことわられるにきまっているよ。
  Translation: If you make such a sudden request, of course they’re going to turn you down.
  The sentence-final 「よ」 makes the speaker’s stance even clearer. It can sound like a warning or carry a mildly teasing tone.
• Example:  そんな話、冗談に決まってるじゃん。
  Kana: そんなはなし、じょうだんにきまってるじゃん。
  Translation: Something like that is obviously a joke.
  「〜に決まってる」 followed by 「じゃん」 is highly conversational and works well between people who are close. It is not appropriate to copy directly into formal situations.

What Is 「〜に決まってる」? The More Common Conversational Form

「〜に決まってる」 is a common conversational form of 「〜に決まっている」 in which 「〜ている」 is contracted to 「〜てる」. The grammatical meaning does not change. It still expresses a strong judgment such as “Of course that’s the case” or “That result is certain,” but the sentence as a whole sounds more like ordinary conversation between friends.

In actual conversation, 「〜に決まってる」 appears more often than the full 「〜に決まっている」 when contradicting someone, teasing them, giving a strong guarantee, or speaking rather directly. For example, 「無理に決まってるよ」 has the feeling of “Of course that’s impossible,” while 「勝つに決まってるじゃん」 is like saying, “Of course we’re going to win—obviously.” Expressions like these often appear together with 「よ」, 「じゃん」, and 「でしょ」, making the speaker’s attitude more noticeable than in a simple statement.

One point to keep in mind is that changing the form to 「〜に決まってる」 does more than make it grammatically conversational. The whole sentence also tends to sound more casual and direct. It is natural with friends and people you know well, but if you say 「〜に決まってる」 to a boss, customer, shop employee, or someone you have just met about something that is not yet completely certain, it can sound too categorical. If you only want to express your own conjecture, forms such as 「〜と思います」, 「〜でしょう」, or 「〜かもしれません」 can leave more room for uncertainty.

What Is the Difference Between 「〜に決まっている」, 「〜に違いない」, and 「〜はずだ」?

「〜に決まっている」, 「〜に違いない」, and 「〜はずだ」 can all be translated into Chinese with words such as 「一定」 or 「應該」, but they differ in how the speaker arrives at the judgment. 「〜に決まっている」 directly asserts that the answer must be a certain way and often carries the tone of “Isn’t that obvious?” 「〜に違いない」 usually expresses a highly confident inference made after observing some clue or circumstance. 「〜はずだ」 generally has a traceable premise, such as a schedule, agreement, rule, or known piece of information, and the speaker concludes that based on those conditions, things should logically be a certain way.

Comparison	「〜に決まっている」	「〜に違いない」	「〜はずだ」
Basic meaning	Of course… / definitely…	Must be… / surely…	Should… / ought to…
What the sentence does	Directly asserts an answer	Infers a highly probable conclusion from circumstances	Calculates an expected result from known conditions
Basis for the judgment	Experience, common sense, knowledge of a person, personal stance	Visible clues, circumstances, observed information	Schedules, promises, rules, time, known facts
Is an explicit clue required?	Not necessarily	Usually there is some information or situation to judge from	Usually there is a clear premise
Speaker’s attitude	Very certain and often emotional	Highly confident, but more inferential	Judges that something should be so based on the conditions
Emotional tone	Common, especially in contradictions and retorts	Can be emotional, but inference remains central	Usually less emotional; premises and expectations are central
Conversational feel	Very strong; 「〜に決まってる」 is especially common	Used in both conversation and narration	Very common in conversation
Can reality differ from the expectation?	At the time of speaking, the speaker leaves almost no room for another possibility	At the time of speaking, the speaker strongly believes the inference is correct	Yes. Later, reality may turn out differently from what was expected
Common Chinese translation	當然、一定、肯定	一定、肯定、想必	應該、照理說應該
Example	彼なら来るに決まっている。	電気がついている。誰かいるに違いない。	7時に来ると言っていたから、もうすぐ着くはずだ。
Nuance of the example	Based on knowing the person, the speaker directly asserts that he will definitely come	The light is on, so the speaker infers from that clue that someone must be inside	He said he would come at seven, so based on the time he should arrive soon

▌「〜に決まっている」 vs 「〜に違いない」｜Direct Assertion vs Inference from Clues

When using 「〜に決まっている」, the speaker has already settled on the answer and does not necessarily need to spell out the evidence one item at a time. Experience, common sense, or familiarity with someone can all provide a basis for the judgment, and the speaker’s own stance is often easy to hear. 「〜に違いない」, by contrast, is more like observing a situation first and then using it to reach a conclusion. Both patterns express strong confidence, but the former often sounds like “Of course that’s the answer,” while the latter more readily sounds like “Given these clues, that must be the case.”

• Example:  あの店はいつも行列ができているんだから、おいしいに決まっているよ。
  Kana: あのみせはいつもぎょうれつができているんだから、おいしいにきまっているよ。
  Translation: That restaurant always has a line, so of course it must be good.
  The speaker directly connects “there is always a line” with “the food is good,” expressing a very strong sense of certainty. This does not mean the speaker has actually confirmed the taste; it simply means they are stating their own judgment very strongly.
• Example:  店の前にこんなに人が並んでいる。きっと人気の店に違いない。
  Kana: みせのまえにこんなにひとがならんでいる。きっとにんきのみせにちがいない。
  Translation: There are this many people lined up in front of the restaurant.
  It must be a popular place.Here, the speaker first observes the large number of people in line and then infers that the restaurant is popular. 「〜に違いない」 makes it sound more like a conclusion drawn from the visible situation.

▌「〜に決まっている」 vs 「〜はずだ」｜Direct Assertion vs Reasoning from a Premise

「〜に決まっている」 does not require a formal arrangement or information that can be checked. As long as the speaker is extremely confident, they can state the conclusion directly. 「〜はずだ」, on the other hand, usually allows you to answer the question “Why do you think so?” because there is often a schedule, agreement, rule, or some other known information behind the judgment. Because 「〜はずだ」 carries the sense of “Given the conditions, this is what should happen,” it is also natural to say 「〜はずだったのに」 when things later turn out differently from what was expected.

• Example:  あの人なら、時間どおり来るに決まっているよ。
  Kana: あのひとなら、じかんどおりくるにきまっているよ。
  Translation: If it’s him, of course he’ll be on time.
  The judgment comes from knowing the person’s usual behavior. The speaker is not referring to a timetable or the details of an agreement, but simply feels very certain that “He’ll definitely be on time.”
• Example:  7時に来ると言っていたから、もうすぐ着くはずだ。
  Kana: しちじにくるといっていたから、もうすぐつくはずだ。
  Translation: He said he would come at seven, so he should arrive soon.
  “He said he would come at seven” is known information, and the judgment that follows is calculated from that time. If the person ultimately does not appear, you can still say 「もう着くはずだったのに、まだ来ない」, meaning that based on the original expectation, they should have arrived already, even though reality turned out differently.

▌「〜に違いない」 vs 「〜はずだ」｜Highly Confident Inference vs What Should Be True Based on the Conditions

Both 「〜に違いない」 and 「〜はずだ」 have a basis, but they focus on different things. 「〜に違いない」 emphasizes that the speaker reaches a highly confident inference based on what they can currently see, hear, or know. 「〜はずだ」 focuses more on whether the conclusion follows from the premise. If someone’s shoes are still in the entryway and there is noise coming from the room, so you infer that the person must still be home, 「〜に違いない」 works well. If you know that the person has the day off work, and therefore reason that they should be at home now, 「〜はずだ」 is more appropriate.

• Example:  靴がまだ玄関にある。彼はまだ家にいるに違いない。
  Kana: くつがまだげんかんにある。かれはまだいえにいるにちがいない。
  Translation: His shoes are still in the entryway.
  He must still be at home.The shoes are a visible clue, and the speaker uses them to infer that the person has probably not left yet, with a high degree of confidence in that inference.
• Example:  今日は仕事が休みだから、彼は家にいるはずだ。
  Kana: きょうはしごとがやすみだから、かれはいえにいるはずだ。
  Translation: He has the day off work today, so he should be at home.
  The judgment comes from the known fact that he has the day off. The sentence does not indicate that the speaker has seen any evidence of him actually being at home; it simply reasons from the information currently available.

▌How the Three Patterns Differ When Judging That Someone Has “Already Arrived at the Station”

Even when expressing that someone has probably already arrived at the station, changing the grammatical pattern changes the speaker’s standpoint. 「〜に決まっている」 sounds like the speaker is drawing a direct conclusion based on their usual understanding of the person. 「〜に違いない」 requires some sign or clue, from which the speaker infers that the person has already arrived. 「〜はずだ」 works from known conditions such as the agreed time or travel time and produces the conclusion that, logically, the person should already be there.

• Example:  いつも30分前に来る人だから、もう駅に着いているに決まっているよ。
  Kana: いつもさんじゅっぷんまえにくるひとだから、もうえきについているにきまっているよ。
  Translation: He always arrives 30 minutes early, so of course he’s already at the station by now.
  The speaker knows the person’s usual habits very well and therefore directly assumes that this time too, the person must already have arrived. The tone of “Of course he’s already there” is much stronger than a simple prediction.
• Example:  さっき駅の近くにいると連絡があったから、もう駅に着いているに違いない。
  Kana: さっきえきのちかくにいるとれんらくがあったから、もうえきについているにちがいない。
  Translation: He messaged a little while ago saying he was near the station, so he must have arrived by now.
  The earlier message becomes the basis for the inference. Moving from “He was already nearby” to “He must have arrived now” fits the use of 「〜に違いない」 to infer a result from a clue.
• Example:  6時に着く電車に乗ったから、もう駅に着いているはずだ。
  Kana: ろくじにつくでんしゃにのったから、もうえきについているはずだ。
  Translation: He took the train that arrives at six, so he should already be at the station by now.
  This sentence has a specific train and arrival time, allowing the current state to be calculated from known information. Even if you later discover that the train was delayed, the original reasoning behind 「〜はずだ」 still made sense; the actual result simply differed from the expectation.

Useful Japanese for Travel: How to Use 「〜に決まっている」 Naturally with Friends

When traveling in Japan, 「〜に決まっている」 is more suitable for conversations with friends traveling with you, especially when you want to express a strong judgment such as “Do you even need to think about it?” or “That’s obviously how it is.” Situations where the answer already seems clear—such as going to a popular restaurant on a Friday night or trying to catch the last train with only a few minutes left—are exactly where you may hear the conversational 「〜に決まってる」. However, the pattern states the speaker’s judgment very strongly. If you are speaking to a shop employee, hotel staff member, or someone you do not know well, using 「〜に決まっている」 about something that has not yet been confirmed may sound overly categorical. When traveling, consider who you are speaking to: it is natural for friends to use it for teasing or strong judgments, while situations requiring polite questions generally call for expressions such as 「〜と思います」, 「〜でしょう」, or 「〜かもしれません」 that leave more room for uncertainty.

▌Situation ①｜Friends Discussing Whether to Reserve a Popular Restaurant

A：この店、予約なしでも入れるかな。
　　このみせ、よやくなしでもはいれるかな。
　　Do you think we can get into this restaurant without a reservation?

B：金曜日の夜だから、混んでるに決まってるよ。予約しよう。
　　きんようびのよるだから、こんでるにきまってるよ。よやくしよう。
　　It’s Friday night, so of course it’s going to be crowded. Let’s make a reservation.

📌 Grammar Point: 「混んでるに決まってる」 is not simply predicting that the restaurant might be crowded. B already treats “It will obviously be crowded on a Friday night” as an answer that hardly needs checking. The contracted 「〜に決まってる」 fits naturally into a conversation between friends, while the final 「よ」 makes B’s stance even clearer. If B simply wanted to say calmly, “I think it’ll be crowded,” 「混んでいると思うよ」 would remove much of this strong sense of assertion.

▌Situation ②｜A Friend Tries to Catch the Last Train with Only a Few Minutes Left

A：今から駅まで歩いて、終電に間に合うかな。
　　いまからえきまであるいて、しゅうでんにまにあうかな。
　　If we walk to the station now, do you think we can still catch the last train?

B：あと5分しかないんだから、間に合わないに決まってるよ。タクシーにしよう。
　　あとごふんしかないんだから、まにあわないにきまってるよ。タクシーにしよう。
　　There are only five minutes left. Of course we’re not going to make it. Let’s take a taxi.

📌 Grammar Point: 「間に合わないに決まってる」 directly treats “not making it” as the conclusion and is noticeably stronger than 「間に合わないと思う」. The preceding 「あと5分しかないんだから」 provides a reason, but that does not turn 「〜に決まってる」 into detached logical reasoning. It still sounds like “There are only five minutes left—how could we possibly make it?” This kind of mildly teasing or exasperated expression sounds natural between people who know each other well.

▌Situation ③｜Asking Hotel Staff About Something That Is Not Yet Certain

A：明日の朝は、タクシーがすぐ来ますか？
　　あしたのあさは、タクシーがすぐきますか？
　　Will a taxi be able to come quickly tomorrow morning?

B：朝は混みますので、少し時間がかかると思います。
　　あさはこみますので、すこしじかんがかかるとおもいます。
　　Mornings are busy, so I think it may take a little time.

📌 Grammar Point: In this kind of service setting, changing B’s response to 「時間がかかるに決まっています」 would still be grammatically possible, but it would sound like “Of course it’s going to take time,” which is too forceful when speaking to a guest. The staff member cannot know tomorrow morning’s traffic conditions with complete certainty, so 「〜と思います」 sounds more natural and leaves room for reality to turn out differently. The issue with 「〜に決まっている」 is not simply one of politeness or honorific language. Even if you say the polite 「〜に決まっています」, the original forceful assertion remains.

Usage Notes:

1. 「〜に決まっている」 often appears with conversational endings such as 「よ」, 「じゃん」, and 「でしょ」 between friends. For example, 「そんなの無理に決まってるよ」 carries the tone of “Of course that’s impossible,” while 「冗談に決まってるじゃん」 sounds like “Of course it’s a joke.” In such cases, the overall impression is influenced not only by the grammar itself but also by the sentence ending and the speaker’s tone. The same sentence can therefore sound like light teasing or somewhat irritated depending on how it is delivered.
2. 「〜に決まっている」 does not mean “There is sufficient evidence, therefore this must be true.” If you see a long line outside a popular restaurant while traveling and say 「おいしいに決まってる」, you are confidently asserting that it must be good; the existence of the line itself does not actually prove the quality of the food. This is one reason it can be confused with 「〜に違いない」. 「〜に違いない」 more readily gives the impression that the speaker has observed some situation and then made an inference, while 「〜に決まっている」 often simply states the answer as though there were no need to consider alternatives.
3. When speaking to shop employees, hotel staff, or people you do not know well, the issue is usually not whether 「〜に決まっている」 is grammatically wrong, but that the pattern easily turns unconfirmed matters into categorical statements. Questions such as whether it will rain tomorrow, whether a restaurant will be full, or how quickly a taxi will arrive all involve uncertainty, so 「〜と思います」, 「〜でしょう」, and 「〜かもしれません」 are generally more suitable. By contrast, when friends traveling together already share the same information and are simply teasing one another or expressing a confident opinion, 「〜に決まってる」 sounds very natural.

Understanding Japanese 「〜に決まっている」 Through Korean 「-(으)ㄹ 게 뻔하다」

Japanese 「〜に決まっている」 and Korean 「-(으)ㄹ 게 뻔하다」 can both express the idea that “the result is almost obvious without even having to think about it,” so they often appear in similar situations with sentences such as “He’s definitely going to be late” or “This is definitely going to fail.” Their nuances, however, do not completely overlap. Japanese 「〜に決まっている」 primarily expresses the speaker’s strong conviction and directly asserts the result. It can be used for both positive and negative outcomes. Korean 「-(으)ㄹ 게 뻔하다」 more often describes a result that can already be anticipated from the current situation, and in actual conversation it is especially common with undesirable results such as being late, failing, being rejected, or being unable to get in. The two patterns can therefore help explain each other, but Japanese 「〜に決まっている」 should not always be mechanically replaced with 「-(으)ㄹ 게 뻔하다」.

◆ Similar Grammar: 「-(으)ㄹ 게 뻔하다」

Korean 「-(으)ㄹ 게 뻔하다」 attaches to verbs or adjectives and indicates that, based on the current situation, the result that will follow is already fairly obvious. 「뻔하다」 itself means that something is clear enough to see without much thought, so 「늦을 게 뻔하다」 is not an ordinary guess that someone “might be late.” Instead, it conveys that given the situation, being late is practically an obvious result. This sense of “the outcome is already clear” is quite close to how Japanese 「〜に決まっている」 excludes most other possibilities.

• Example: 今日も遅れるに決まってる。
  Kana: きょうも おくれる に きまってる。
  Translation: He’s definitely going to be late again today.
  In Korean, you can say 「오늘도 늦을 게 뻔해」.
• Example: 予約しなかったら、入れないに決まってる。
  Kana: よやくしなかったら、はいれない に きまってる。
  Translation: If we don’t make a reservation, there’s no way we’ll get in.
  In Korean, you can say 「예약을 안 하면 못 들어갈 게 뻔해」.
• Example: そんな準備不足で行ったら、失敗するに決まってるよ。
  Kana: そんな じゅんびぶそくで いったら、しっぱいする に きまってるよ。
  Translation: If you go in that underprepared, of course you’re going to fail.
  In Korean, you can say 「그렇게 준비도 안 하고 가면 실패할 게 뻔해」.

◆ Japanese 「〜に決まっている」 Has a Wider Range and Can Be Used Naturally for Positive Results

One of the biggest differences between the two patterns is that Japanese 「〜に決まっている」 does not require the outcome to be negative. As long as the speaker wants to say “Isn’t it obvious?” or “Of course that’s how it is,” it can be used for positive outcomes such as passing an exam, winning a match, or knowing that someone will like something. Although Korean 「-(으)ㄹ 게 뻔하다」 is not literally restricted to bad outcomes, in actual usage it is particularly likely to be associated with negative predictions. As a result, positive examples of Japanese 「〜に決まっている」 should not all be mechanically replaced with 「-(으)ㄹ 게 뻔하다」.

• Example: あれだけ練習したんだから、本番もうまくいくに決まっている。
  Kana: あれだけ れんしゅうしたんだから、ほんばんも うまくいく に きまっている。
  Translation: You practiced that much, so of course the real performance is going to go well.
  The outcome here is positive, but 「〜に決まっている」 is completely natural in Japanese. The speaker has seen how much practice the other person has done and therefore confidently asserts that the real performance will go well. In Korean, if you want to express this kind of positive, strong certainty naturally, there is no need to force 「-(으)ㄹ 게 뻔하다」 into the sentence. Depending on the context, expressions such as 「분명」 or 「틀림없다」 can be used instead.
• Example: 彼女なら、このプレゼントを喜ぶに決まってるよ。
  Kana: かのじょなら、この プレゼントを よろこぶ に きまってるよ。
  Translation: If it’s her, she’s definitely going to be happy with this present.
  This judgment comes from knowing the person well, and the speaker directly assumes that she will definitely like the gift. Japanese 「〜に決まってる」 is very natural here, but using Korean 「좋아할 게 뻔해」 can introduce a nuance more like “Of course she’ll react that way,” which does not necessarily match the original straightforward positive certainty perfectly.

◆ Do Not Confuse 「-(으)ㄹ 게 뻔하다」 with 「-(으)ㄹ 뻔하다」

Korean also has the very similar-looking form 「-(으)ㄹ 뻔하다」, but its meaning is completely different. 「-(으)ㄹ 게 뻔하다」 predicts that “given this situation, the outcome will obviously be X.” The version without 「게」, 「-(으)ㄹ 뻔하다」, instead means that something almost happened but ultimately did not. The former is relatively close to Japanese 「〜に決まっている」, while the latter corresponds to “almost…” or “nearly…” in English.

• Example: 이대로 가면 늦을 게 뻔해.
  Romanization: i-dae-ro ga-myeon neu-jeul ge ppeon-hae.
  Translation: If things keep going like this, we’re obviously going to be late.
  When 「게」 is present, the expression predicts the result that will happen next. Based on the current situation, it is already clear that being late is highly likely.
• Example: 오늘 늦을 뻔했어.
  Romanization: o-neul neu-jeul ppeon-hae-sseo.
  Translation: I almost arrived late today.
  This sentence refers to something that has already happened. The speaker almost ended up being late but ultimately was not. Although both forms contain 「뻔하다」, their meanings should not be learned as though they were the same construction.

◆ Difference from Korean 「-(으)ㄹ 게 뻔하다」:

The closest point between Japanese 「〜に決まっている」 and Korean 「-(으)ㄹ 게 뻔하다」 is that both can present a result as something for which there is almost no need to consider other possibilities. Especially with outcomes such as being late, failing, being rejected, or being unable to get in—results that are already easy to predict from the current situation—「늦을 게 뻔해」 and 「실패할 게 뻔해」 can be used naturally in the same kinds of situations as Japanese 「遅れるに決まってる」 and 「失敗するに決まってる」.

The difference is that Japanese 「〜に決まっている」 more directly reflects the speaker’s own conviction. That conviction may come from experience, common sense, or knowledge of a particular person, and the pattern can also be used for contradictions and teasing retorts. The result can be either positive or negative. Korean 「-(으)ㄹ 게 뻔하다」, on the other hand, more readily suggests that “given the current situation, the next result is already obvious,” and it frequently appears with undesirable outcomes. For this reason, when you see positive sentences such as 「合格するに決まっている」 or 「きっと喜ぶに決まっている」, there is no need to automatically replace them with 「-(으)ㄹ 게 뻔하다」 simply to create a direct correspondence with the Japanese. It is more useful to ask whether the sentence is simply expressing strong conviction or whether it means “Given the situation, the result is already obvious.” This leads to a closer understanding of how each expression is actually used in Japanese and Korean.

Japanese 「〜に決まっている」 is stronger than an ordinary “definitely.” 「無理に決まってる」 does not merely mean that the speaker thinks the chances of success are low; the speaker has already decided that “Of course it’s impossible.” 「冗談に決まってる」 is not a guess either, but directly treats “It’s a joke” as the answer. This kind of tone is common among people who know each other well and works naturally for retorts, contradictions, and emphatic assurances. With people you do not know well or in workplace situations, however, it is important to consider whether the expression may sound too forceful.

When comparing it with other conjectural patterns, it helps to look at where the speaker’s judgment begins. 「〜に違いない」 is more like reaching a conclusion after seeing some evidence. 「〜はずだ」 usually relies on a schedule, rule, or other known information. 「〜に決まっている」, by contrast, directly asserts that the answer must be a certain way. When several Japanese sentences can all be translated into Chinese with 「一定」, do not start with the translation. First ask whether the speaker is making an inference or simply stating the answer as though there were no alternative.

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