When do I use 不用 vs 别 to tell someone not to do something?

Use 不用 when you mean it's not necessary (e.g., '你不用去' = you don't have to go). Use 别 when you want to forbid the action (e.g., '你别去' = don't go). The two are not interchangeable.

Can 不用 be used as a negative command?

No. 不用 is not a command; it states that an action is unnecessary. If you want to command someone not to do something, you must use 别.

Is 不用 a polite way to say 别?

Not exactly. They have different meanings. 不用 is polite because it removes obligation, but it does not prohibit. 别 is a direct prohibition. For example, '不用客气' (no need to be polite) is polite, but '别客气' (don't be polite) is more of a command.

Easily confusedHSK 2

不用 vs 别 (búyòng vs bié): 'needn't' vs 'don't'

不用 (búyòng) means 'needn't' or 'it's unnecessary', indicating that an action is not required. 别 (bié) is a negative imperative meaning 'don't', used to prohibit an action or give a command. Learners often confuse them because both can be translated as 'not do' in English, but they carry very different implications: necessity vs. prohibition.

Both 不用 and 别 are used to tell someone not to do something, but they differ in meaning and tone. 不用 expresses that an action is unnecessary (lack of need), often used to politely decline or reassure. 别 is a direct command to forbid an action. Understanding this key difference prevents miscommunication: saying '你不用去' (you don't need to go) is not the same as '你别去' (don't go).

각각 언제 쓰는지

不用bú yòng

needn't

Use 不用 to indicate that something is unnecessary or not required. It is common in polite refusals, such as responding to thanks (不用谢). It can also be used adverbially meaning 'no need to' in statements or suggestions.

不用 can soften a refusal by removing obligation; it is not a command, but a statement of fact or opinion about necessity.

别bié

don't

Use 别 as a negative imperative (command or request) to prohibit an action. It directly tells someone not to do something and is often followed by a verb. It can be softened with particles like 了 or 吧 but still retains a prohibitive meaning.

한눈에 보기

	不用	别
Core meaning	Lack of necessity	Prohibition / command
Tone	Soft, advisory	Direct, commanding
Grammatical function	Modal adverb (can stand alone)	Imperative particle (requires verb)
Common response to thanks	不用谢 (You're welcome)	✗ not used
Negation scope	Negates necessity of the action	Negates the action itself

예문

不用
你不用来上班了。
Nǐ bú yòng lái shàng bān le.
You don't need to come to work.
Shows no necessity, not a command.
别
你别来上班了。
Nǐ bié lái shàng bān le.
Don't come to work.
Prohibition, a direct order not to come.
不用
不用谢！
Bú yòng xiè!
You're welcome! (lit. no need to thank)
Polite refusal of thanks; 别 would be incorrect here.
别
别客气！
Bié kè qi!
Don't be polite! / Make yourself at home.
Negative imperative to not act politely; 不用 would not work.
不用
你不用着急，时间还早。
Nǐ bú yòng zháo jí, shí jiān hái zǎo.
You don't need to worry; there's plenty of time.
Advises against worry due to no need.
别
你别着急，冷静一下。
Nǐ bié zháo jí, lěng jìng yí xià.
Don't worry; calm down.
Commands the listener to stop worrying.

흔한 실수

Using 不用 to mean 'don't' in commands, e.g., '你不用去！' when forbidding someone to go — should be '你别去！'.
Using 别 to mean 'no need' in polite refusals, e.g., '别谢' instead of '不用谢'.
Confusing '不用管' (don't need to bother) with '别管' (don't interfere / mind your own business).
Using 别 with 了 to mean 'no need' (e.g., '别去了' means 'don't go', not 'you don't have to go').

자주 묻는 질문

When do I use 不用 vs 别 to tell someone not to do something?: Use 不用 when you mean it's not necessary (e.g., '你不用去' = you don't have to go). Use 别 when you want to forbid the action (e.g., '你别去' = don't go). The two are not interchangeable.
Can 不用 be used as a negative command?: No. 不用 is not a command; it states that an action is unnecessary. If you want to command someone not to do something, you must use 别.
Is 不用 a polite way to say 别?: Not exactly. They have different meanings. 不用 is polite because it removes obligation, but it does not prohibit. 别 is a direct prohibition. For example, '不用客气' (no need to be polite) is polite, but '别客气' (don't be polite) is more of a command.