务必
be sure to; must, without fail
Structure
（请）主语 务必 （要）动作
What it means
“Be sure to; without fail”: it presses the listener to do something, firmer and more formal than 一定要.
How it is built
（请）subject + 务必（要） + action: 请您务必不要吃早饭 (please be sure not to eat breakfast).
When to use it
Doctor to patient, boss to staff, notice to public; often 请务必 or 务必要. Negative: 务必不要 (in writing also 切勿). 必须 states a rule (学生必须穿校服); 务必 urges (请大家务必穿校服).
Watch out
✗ 他昨天务必来了。 务必 gives instructions, not facts about what happened. Use it for what someone should do.
Examples
医生严肃地嘱咐我爸：“这烟您务必要戒掉！”
The doctor told my dad sternly: “You absolutely must give up smoking!”
明天早上要化验，请您务必不要吃早饭。
You have a lab test tomorrow morning, so please be sure not to eat breakfast.
到了以后务必给家里打个电话。
Be sure to ring home when you get there.
Learn this in Lesson 47 · HSK 5–6: 去医院看病 (Seeing a doctor)
A dialogue, a reading, word cards with audio and a drill that uses it, in Learn Chinese with Bao. The first lessons of every level are free.
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