Obligation (Must / Have to)
5 related grammar points that express the same core idea - compared below so you can tell which one to reach for.
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- ~ないといけない JLPT N4
- ~なきゃいけない JLPT N4
- ~なくてはいけない JLPT N4
- ~なければ ならない JLPT N4
- ~ねばならない JLPT N2
なきゃ / なければならない
Writing, or speaking in a formal setting (a report, an announcement, talking to a superior).
~なければ ならない vs ~なきゃいけない: Use なければならない, the full uncontracted form. なきゃいけない and なくちゃいけない are casual spoken contractions that sound too informal in writing. ねばならない is a step more literary again, common in rules and textbooks.