JLPT N5

～てはいけません

Must not do, prohibited

Structure

Verb て-form + は + いけません

Used to express strict prohibition or a rule against doing something. It means 'it is not allowed to do X'.

ここで写真を撮ってはいけません。

You must not take pictures here.

Confusing it with 〜なくてもいい (don't have to) or 〜ないでください (please don't).

Think of 'te-form + wa' as 'as for doing, it's no good' (いけません).

Import an article and tap any sentence using it. The explanation comes back about the sentence in front of you, not a textbook example.