The Mandarin Chinese word for “must” is 必须 bìxū.
Here are some examples of how to use this word:
- 我必须吃饭. Wǒ bìxū chīfàn – I must eat (food)
- 你必须说中文. Nǐ bìxū shuō zhōngwén – You must speak Chinese
- 必须有三个人吗？Bìxū yǒusān gèrén ma? – Must there be three people?