also: ぢゃない
じゃない · i-adjective
| Form | Positive | Negative |
|---|---|---|
| Dictionary | じゃない | じゃなくない |
| Polite | じゃないです | じゃなくないですalso じゃなくありません |
| Past polite | じゃなかったです | じゃなくなかったですalso じゃなくありませんでした |
| Past | じゃなかった | じゃなくなかった |
| Te-form | じゃなくて | じゃなくなくて |
| Adverbial | じゃなく | |
| Conditional | じゃなければ | じゃなくなければ |
| Tara conditional | じゃなかったら | じゃなくなかったら |
Plain negative form of だ/です. Used in casual speech and writing. The contracted form of ではない.
Sentence-ending tag question seeking agreement or confirmation. Often used with rising intonation.
It's hot today, isn't it?
That is not my book.
He is not a student.
That movie was interesting, wasn't it?
じゃない is a casual contraction of ではない, used interchangeably in relaxed speech.
じゃない is the standard casual tag used to seek confirmation ('isn't it?'), while sentence-final ちゃう？ does the same job in Kansai-ben.
じゃない is the full negative tag question form, while じゃ is its casual, clipped abbreviation used the same way.
じゃない is the casual, contracted form used in speech, while ではない is the more formal or written negative form of だ/です.
Contraction of ではない (de wa nai), the negative form of the copula だ. The particle は (wa) contracts with で (de) to じゃ (ja) in casual speech.