んじゃ => If ... then... N4
Condition (hypothetical condition)
んじゃない => can not, impossible to... N4
Ban
じゃありません => not to be N5
Emphasize negative meaning
んじゃなかったか => shouldn't have... N4
Regret
んじゃないか => right? isn't it? let's~; confirmation N4
Confirm
んじゃない => confirmation of information; express surprise towards listener N4
Speculation
じゃありませんでした => was not, were not N5
Emphasize negative meaning
そうじゃありません => Not like that, Not that way N5
Confirm
~をきんじえない(~を禁じ得ない) => can't help but; can't refrain from ~ N1
んじゃないだろうか => could it be that ~; might it be that ~ N4
Speculation
じゃないが => It's not that... but... N4
How to say the beginning
じゃ(あ) / では => Then, so (Expressing attitude) N5
Change the way you speak