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JLPT N5 Grammar

てはいけない

N5Obligation

N5 · Obligation · te-form verb + はいけない

must not; is prohibited

te-form verb + はいけない

てはいけない means an action is forbidden or not allowed.

In speech it often becomes ちゃいけない. A polite warning uses てはいけません.

図書館で大きな声で話してはいけません。

You must not speak loudly in the library.

Do not confuse it with なくてもいい. This means prohibition; that means not necessary.

いけない means 'not okay.'

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