请勿 / 切勿 + 动词
please do not; on no account (in notices and warnings)
Structure
请勿 ／ 切勿 动词（短语）
What it means
勿 is the classical 不要 or 别. 请勿 is the polite “please do not” of signs; 切勿 is the stronger “on no account”, for warnings where something real is at stake.
How it is built
请勿／切勿 + verb (phrase): 文物容易损坏，请勿触摸 (These relics are fragile. Please do not touch). Warnings: 切勿轻信, 切勿转账.
When to use it
Notices, rules, instructions and public warnings (请勿吸烟, 请勿拍照). To a friend say 别 or 千万别. Compare 切忌 (lesson 8-2), “be sure to avoid”, which reads more like advice than a ban.
Watch out
勿 is already negative, so never add another: ✗ 请勿不要吸烟 ✓ 请勿吸烟. Keep 请勿 for polite signs and 切勿 for serious warnings.
Examples
文物容易损坏，请勿触摸。
These relics are fragile. Please do not touch.
出门旅行时，切勿把护照交给陌生人保管。
When you travel, never hand your passport to a stranger to look after.
切勿下载来历不明的App，以免引狼入室。
Never download an app of unknown origin, or you may be letting the wolf into the house.
Learn this in Lesson 196 · HSK 7–9: 个人信息保护 (Protecting personal information)
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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