JLPT N4 Elementary
ないといけない
Must do; have to do
Readings
Other forms
なければならない formal/written
なくてはいけない slightly formal
ないとだめ casual
なくちゃ very casual contraction
ないと very casual, spoken
Grammar Pattern / Expression
Must do / Have to do
Expresses necessity by literally stating that if an action is not performed, the result will be unacceptable.