Structure
Details
About んじゃない
んじゃない is a slightly slang grammar pattern used with verbs to prohibit or request that something not be done. It will usually just be translated as 'don't do (A)', or 'you mustn't (A)'. んじゃない is almost always used from a higher position toward someone of a lower status. It may be used when the speaker is angry, but not always.
んじゃない is a combination of the case-marking particle の, and the abbreviated form of ではない, じゃない. It will connect to the dictionary form of verbs.
It is also common to see the abbreviated ている form, てん, before じゃない.
んじゃない is a combination of the case-marking particle の, and the abbreviated form of ではない, じゃない. It will connect to the dictionary form of verbs.
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親に向かってそんなこと言うんじゃない。Don't say something like that directed at your parents!
- そこら辺のキノコを食べるんじゃない!Don't eat the mushrooms from around there!
- 今日は混んでるからパパから離れるんじゃないぞ!It's crowded today, so don't get separated from your dad!
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勝手にお友達のものを取るんじゃありません。You shouldn't just freely take your friend's things.
- 乳児にハチミツをあげるんじゃありません。Don't give honey to infants.
It is also common to see the abbreviated ている form, てん, before じゃない.
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いつまでもケラケラしながら話してんじゃない!Don't keep laughing while you're talking!
- 一日中ダラダラしてんじゃない!いい加減、仕事でも探してこい!Don't laze around all day! Get your act together and find a job!
Caution - When used in the past tense, んじゃなかった indicates that something 'should not have been done', and has a nuance of regret or disappointment that the action occurred.
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こんな安い車を買うんじゃなかった。I shouldn't have bought a cheap car like this.
- あんな怪しい話に乗るんじゃなかった。I shouldn't have gotten swept up in such a suspicious story.
Caution - When んじゃない comes at the end of a sentence, it will be important to listen to the intonation, as the statement may actually be a question. In this case, it is an abbreviation of んじゃないか.
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本当は彼も来たかったんじゃない?Really though, didn't he want to come too?
Examples
僕をバカにするんじゃない!
Don't make a fool of me!
先生:「カンニングをするんじゃない!」
Teacher: 'Don't cheat!'
パチンコに行ってお金を無駄にするんじゃない!
Don't go to pachinko and waste money!
嘘をつくんじゃありません。
You shouldn't lie.
あなた、仕事をサボるんじゃありません。
Hey, don't skip work.
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