Meaning & usage
なければならない expresses obligation or necessity, meaning someone has to do something or is required to do it. It attaches to the nai-form of a verb with ない removed, as in 行かない to 行かなければならない, with the polite form なければなりません. Although it contains a negative conditional, the meaning is affirmative, and casual speech often shortens it to なきゃ or なくちゃ.
Example sentences 7
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私は明日の朝早くここを出発しなければなりません。
I have got to leave here early tomorrow morning.
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あなたはすぐに行かなければならない。
You must go at once.
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明日までに書かなければならないレポートがいくつかある。
I have a few essays to write by tomorrow.
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明日までに仕事を終えてしまわなければならない。
I must have my work finished by tomorrow.
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明日は早起きしなければならない。ピクニックにいくのだから。
We've got to get up early tomorrow. We're going on a picnic.
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やらなければならない事がありすぎる!
There are too many things to do!
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父はその仕事をしなければならない。
My father must do the work.
In past JLPT papers
This came up in 4 past exam questions.