Explanation
Express obligation or necessity; 'must', 'have to', 'need to'.
Formation
Verb-ない form + なければ ならない
Detailed explanation
The ～なければ ならない grammar point is used to express obligation or necessity. In English, it can be translated as 'must', 'have to', or 'need to'. The formation differs depending on whether it is used with a verb. It cannot be used with い-adjectives, な-adjectives or nouns.
Examples
宿題をやらなければならない。
Shukudai wo yaranakereba naranai.
I have to do my homework.
明日までにこの本を読まなければならない。
Ashita made ni kono hon wo yomanakereba naranai.
I have to read this book by tomorrow.
授業に遅れないように、早く起きなければならない。
Jugyou ni okurenai you ni, hayaku okinakereba naranai.
I have to wake up early so I don't be late for class.
旅行に行く前に切符を買わなければならない。
Ryokou ni iku mae ni kippu wo kawanakereba naranai.
I have to buy a ticket before going on a trip.
Practice
Grammar content sourced from hanabira.org.