〜てはいけない
Formation
N5ObligationNeutral
Variations
ちゃいけない
Colloquial
じゃいけない
Colloquial
Meaning
Must not / Should not. Indicates a prohibition or regulation. In casual speech, contracted to ちゃいけない or じゃいけない.
Note
Used to express a prohibition or that something is not allowed. In colloquial speech, it often contracts to 'ちゃいけない' or 'じゃいけない'.
Examples
ここで写真を撮ってはいけない。
You must not take photos here.
嘘をついてはいけません。
You must not tell lies.
授業中に寝ちゃいけないよ。
You shouldn't sleep during class.
遅刻しちゃいけない。
You mustn't be late.
ここでお酒を飲んじゃいけない。
You must not drink alcohol here.
夜遅くに騒いじゃいけない。
You must not make noise late at night.