HSK 7–9 grammar · adverb
勿
勿 — do not (formal prohibition)
Pattern
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( ) can be left out · other words may come before, between and after
How it works
勿 is the formal written "do not", the register of public signs and notices: 请勿吸烟. In speech the same idea is 别 or 不要.
Examples
请勿触摸展品。
Qǐng wù chùmō zhǎnpǐn.
Please do not touch the exhibits.
闲人勿进。
Xiánrén wù jìn.
No unauthorised entry.
Related

See it in a story
In the app, 勿 is underlined wherever it appears in the stories you read, and practised with sentences from them. Free.