必须 (bì xū) — must; have to; be required to

Definition

必须 (bìxū) is the formal 'must' — stronger than 应该 and more written than the colloquial 得 (děi). Used for rules, requirements, and firm obligations.

adverb

musthave tobe required to

Easily confused

必须。
Nǐ bì xū xiān wán chéng zuò yè zài wán.
You must finish your homework before you play.
必须。
Wǒ men bì xū zài bā diǎn qián dào xué xiào.
We must arrive at school before eight o'clock.
，。
Tā bú bì xū qù, tā kě yǐ zì jǐ jué dìng.
He doesn't have to go; he can decide for himself.

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