ないと/なくちゃ/なきゃ => must do; need to; gotta do ~ N3
…のも無理 (は) ない => It's natural for... N3
Evaluate
なけりゃ => If not ... N2
Condition (hypothetical condition)
のも無理もない => (to be) natural,(to be) understandable N3
Evaluate
~なくちゃいけない      => must do; need to; gotta do ~, say necessary to do something N5
Obligatory
なければならない/なくてはならない/なければいけない/なくてはいけない/なければだめ/なくてはだめ => must N5
ていけない => Suddenly... N3
Simultaneously
じゃないか / ではないか => right? isn't it? N3
Confirm
じゃないが => It's not that... but... N4
How to say the beginning
んじゃない => can not, impossible to... N4
Ban
じゃないか / ではないか => right?; isn't it? (Criticism) N3
Criticize
じゃないか / ではないか => right? isn't it? let's~; confirmation N3
Surprised