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
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
んじゃ => If ... then... N4
Condition (hypothetical condition)
くださいませんか => Could(Would) you please N4
んじゃないだろうか => could it be that ~; might it be that ~ N4
Speculation
ちゃんと => Clear, neat, dignified, complete N3
Result status
~でなくてなんだろう => must be; is definitely ~ N1
Emphasize
させてください/させてもらえますか/させてもらえませんか => please let me do N3
ちゃんとする => Serious, tidy, complete N3
Result status
んじゃない => can not, impossible to... N4
Ban