んじゃ => If ... then... N4
Condition (hypothetical condition)
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
んじゃない => can not, impossible to... N4
Ban
じゃないか => right? isn't it? let's~; confirmation N4
Speculation
じゃありません => not to be N5
Emphasize negative meaning
じゃ(あ) / では => then; well; so; well then N5
Change the way you speak
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) / では => If so, Well (then), In that case N5
Speculation
じゃないか / ではないか => right? isn't it? N3
Confirm