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Expressing must or have to with 必须 (bìxū)
Obligation & Necessity
Structure
Subject + 必须 + Verb
Explanation
必须 means "must" or "have to," indicating a strong obligation or requirement. It is placed before the verb to express that something is mandatory. Unlike 得 (děi), 必须 carries a more formal, emphatic tone.
Examples
明天的会议很重要，你必须参加。
Míngtiān de huìyì hěn zhòngyào, nǐ bìxū cānjiā.
Tomorrow's meeting is very important; you must attend.
过马路的时候必须看红绿灯。
Guò mǎlù de shíhòu bìxū kàn hónglǜdēng.
You must watch the traffic lights when crossing the street.
这件事你必须跟她说清楚。
Zhè jiàn shì nǐ bìxū gēn tā shuō qīngchǔ.
You must explain this matter clearly to her.