なくてはならない (Must do)
Must do, Have to do
JLPT N5
Pattern
Verb (ない-form → なくて) + はならない
How it works
なくてはならない also means “must do”, formed like なくてはいけない. It sounds more formal and suits general rules and duties. Polite: なくてはなりません.
Examples
- 学生は べんきょうしなくては なりません。Students must study.
- パスポートを 見せなくては なりません。You must show your passport.
Related grammar
Further reading
Bunpro N5 · Lesson 9Put your practice together
Work through a complete paper at your own pace or choose a timed mock exam. No account is needed to begin.