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JLPT N4 Grammar

なくてはいけない

N4Obligation

N4 · Obligation · nai-form verb + くてはいけない

must; have to

nai-form verb + くてはいけない

なくてはいけない expresses obligation in a full form, stronger and more complete than casual contractions.

In speech, it often becomes なくちゃいけない.

明日までに申込書を出さなくてはいけません。

I must submit the application form by tomorrow.

Use the なくて form from the ない form, not the dictionary form.

If not doing it is not okay, then it must be done.

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