Saying "Not" in Mandarin — It Depends on What You Mean
English has one all-purpose word for negation: "not." Mandarin splits this job among several words, each with a distinct role. The two most important are 不 (bù) for general and habitual negation, and 没 (méi) for negating past actions and the verb 有. Choosing between them is one of the first real grammar decisions Mandarin learners must make.
When in doubt, use 不 (bù). It is the default negation word for the present and future, for adjectives, for willingness, and for habitual actions. Reserve 没 (méi) specifically for past actions and for negating 有 (to have).
不 (bù) — General Negation
不 (bù) is the most common negation word in Mandarin. It negates verbs and adjectives in the present, future, and habitual sense.
我不喜欢辣的。
wǒ bù xǐhuan là de.
I do not like spicy food.
他不是老师。
tā bú shì lǎoshī.
He is not a teacher.
Use 不 for:
- Habitual actions: 我不喝酒 (I don't drink alcohol)
- Present states: 我不忙 (I'm not busy)
- Future plans: 明天我不去 (I'm not going tomorrow)
- Willingness: 我不想吃 (I don't want to eat)
- With adjectives: 不好 (not good), 不大 (not big)
- With 是: 不是 (is not)
Tone Change Rule for 不
不 is naturally a fourth tone (bù), but it changes to second tone (bú) when followed by another fourth tone. This tone sandhi rule is mandatory.
不是 (búshì) — is not
búshì
(不 changes from 4th to 2nd tone before 是, which is 4th tone)
不要 (búyào) — don't want
búyào
(不 changes from 4th to 2nd tone before 要, which is 4th tone)
没 (méi) — Past and Existential Negation
没 (méi), often appearing as 没有 (méiyǒu), negates completed actions and the verb 有 (yǒu, to have/exist).
我昨天没去上班。
wǒ zuótiān méi qù shàngbān.
I did not go to work yesterday.
我没有钱。
wǒ méiyǒu qián.
I do not have money.
Use 没 for:
- Past actions that did not happen: 他没来 (He didn't come)
- Negating 有 (to have): 我没有车 (I don't have a car)
- Negating 有 (to exist): 桌子上没有书 (There are no books on the table)
- Experiences that have not occurred: 我没去过中国 (I haven't been to China)
不 vs 没 — The Critical Distinction
This is the most important negation rule in Mandarin. Getting it wrong is immediately noticeable to native speakers.
| 不 (bù) | 没 (méi) | |
|---|---|---|
| Time focus | Present, future, habitual | Past, completed |
| Use with | Most verbs, adjectives, 是 | 有, past actions |
| Meaning | Won't, don't, isn't | Didn't, haven't, don't have |
我不吃肉。
wǒ bù chī ròu.
I don't eat meat. (habitual — I never eat meat)
我没吃早饭。
wǒ méi chī zǎofàn.
I didn't eat breakfast. (past — this morning specifically)
The 不 vs 没 distinction is the number one negation mistake for Mandarin learners. Remember: 没 is for past actions and for negating 有. 不 is for everything else. Also, 没 and 了 never appear together — 我没去了 is wrong. Say 我没去 (I didn't go).
别 (bié) — Negative Commands
别 (bié) means "don't" and is used for commands, requests, and warnings. It is the imperative form of negation.
别走！我还有话说。
bié zǒu! wǒ hái yǒu huà shuō.
Don't leave! I still have something to say.
别担心，一切都会好的。
bié dānxīn, yīqiè dōu huì hǎo de.
Don't worry, everything will be fine.
别 is softer and more colloquial than 不要 in commands. It is the word you will hear most often in everyday speech when someone tells you not to do something.
不要 (búyào) — "Don't Want" and Strong "Don't!"
不要 serves two roles: expressing that you do not want something, and issuing a strong prohibition.
我不要这个。
wǒ búyào zhège.
I don't want this one.
不要说话！考试开始了。
búyào shuōhuà! kǎoshì kāishǐ le.
Don't talk! The exam has started.
In commands, 不要 is more formal and emphatic than 别. Signs and official notices tend to use 不要 or 请勿 (qǐng wù) rather than 别.
不用 (búyòng) — "No Need To"
不用 is a polite way to decline help or say something is unnecessary. It literally means "no need to use."
不用谢！
búyòng xiè!
No need to thank me! (You're welcome!)
不用等我，你先走吧。
búyòng děng wǒ, nǐ xiān zǒu ba.
No need to wait for me, go ahead first.
还没 (hái méi) — "Not Yet"
还没 (hái méi), often followed by 呢 (ne), expresses that something has not happened yet but is expected to.
我还没吃饭呢。
wǒ hái méi chīfàn ne.
I haven't eaten yet.
他还没来。
tā hái méi lái.
He hasn't arrived yet.
Double Negation
Two negation words together create an emphatic positive meaning, similar to English "can't not" or "have no choice but to."
你不能不去。
nǐ bù néng bú qù.
You cannot not go. (You must go.)
这件事不得不说。
zhè jiàn shì bùdébù shuō.
This matter cannot not be said. (This must be said.)
When receiving a compliment, Chinese people often use 没有没有 (méiyǒu méiyǒu) — literally "don't have, don't have" — as a humble denial. Like 哪里哪里, this is a way of modestly deflecting praise. Someone might say "Your Chinese is so good!" and the response would be 没有没有, meaning "not at all, not at all."
Quick Reference Table
| Negation Word | Pinyin | Meaning | Use Case | Example |
|---|---|---|---|---|
| 不 | bù | not, don't | General, habitual, future | 我不去 (I'm not going) |
| 没 | méi | didn't, haven't | Past actions | 我没去 (I didn't go) |
| 没有 | méiyǒu | don't have | Negating 有 | 我没有车 (I don't have a car) |
| 别 | bié | don't! | Friendly commands | 别跑！(Don't run!) |
| 不要 | búyào | don't want / don't! | Refusal, strong commands | 不要迟到 (Don't be late) |
| 不用 | búyòng | no need to | Polite declining | 不用客气 (No need to be polite) |
| 还没 | hái méi | not yet | Pending actions | 还没到 (Haven't arrived yet) |
| 不能不 | bù néng bù | must (double neg.) | Emphatic obligation | 不能不说 (Must say) |
Summary
Mandarin negation is built around a few core words, each with a clear purpose:
- 不 (bù) is the default — use it for present, future, habitual negation, adjectives, and 是
- 没 (méi) is for the past and 有 — "didn't" and "don't have"
- Never combine 没 with 了 — 没去 is correct,
没去了is wrong - 不 changes tone before 4th-tone syllables — 不是 is pronounced búshì
- 别 (bié) for friendly "don't" — the casual imperative
- 不要 (búyào) for strong "don't" — more formal or emphatic
- 不用 (búyòng) for "no need" — polite and commonly used
- 还没 (hái méi) for "not yet" — expected but not completed
