Chinese Negation
不 (bù) vs 没 (méi) — When to Use Each

Two Negation Words: 不 (bù) and 没 (méi)

Chinese uses exactly two words to negate. 不 (bù) covers everything present, habitual, or future — it also expresses unwillingness and negates adjectives. 没 (méi), short for 没有 (méiyǒu), handles past completed actions, specific events that did not occur, and the absence of possession.

The simplest way to remember the split: if the event happened (or didn't happen) in the past as a specific occurrence, use 没. For everything else — general truths, future plans, states, preferences — use 不.

不 (bù) — When to Use It

Negating general habits, preferences, and facts

When something is generally true — a habit, a preference, a standing fact — use 不. These are timeless statements not tied to a specific past event. 我不吃肉。 (Wǒ bù chī ròu — I don't eat meat.) This is not about last Tuesday's dinner; it's a general dietary fact.

Negating the future or a plan

Any action that has not yet occurred — plans, intentions, scheduled events — takes 不. 我明天不去。 (Wǒ míngtiān bú qù — I'm not going tomorrow.) The event is future, so 没 cannot be used — 没 is reserved for things that did not happen in the past.

Negating adjectives

Adjectives are always negated with 不, never 没. 这个不好。 (Zhège bù hǎo — This isn't good.) 天气不冷。 (Tiānqì bù lěng — The weather isn't cold.) This rule is absolute — there is no scenario where 没 precedes a standalone adjective.

Expressing unwillingness (vs inability)

不 also carries the meaning of choice or refusal. Compare: 我不想去 (wǒ bù xiǎng qù — I don't want to go, choice) versus 我不能去 (wǒ bù néng qù — I can't go, external constraint). In both cases 不 is correct because both describe a present/general state, not a specific past event.

没 (méi) — When to Use It

Negating past completed actions

When a specific event did not happen at a specific time in the past, use 没. 我没吃早饭。 (Wǒ méi chī zǎofàn — I didn't eat breakfast.) This is about this morning — a concrete past event. Likewise: 他没来。 (Tā méi lái — He didn't come.) and 我们没看那部电影。 (Wǒmen méi kàn nà bù diànyǐng — We didn't watch that film.)

Negating 有 (to have)

This is the one absolute rule in Chinese negation. 我没有钱。 (Wǒ méiyǒu qián — I don't have money.) 她没有手机。 (Tā méiyǒu shǒujī — She doesn't have a phone.) NEVER use 不有 — it does not exist in standard Mandarin.

过 negation — have never done something

The aspect marker 过 (guò) marks a past experience: “have done X before.” To negate it — “have never done X” — use 没, not 不. 我没去过北京 (wǒ méi qù guò Běijīng — I've never been to Beijing). 不 is always wrong here because you are describing a past experience (or lack of it).

不 vs 没 — Side-by-Side Comparison

The table below maps each scenario to the correct negative word. Where one particle does not apply to that scenario, a dash is shown.

Special Cases and Common Mistakes

不是 — Negating “to be” (是)

The verb 是 (shì — to be) is always negated with 不是. 没是 does not exist. 他不是老师。 (Tā bú shì lǎoshī — He is not a teacher.) This holds whether you are talking about the present, past, or a hypothetical — 是 always pairs with 不.

Tone change of 不 (bù → bú)

不 is normally 4th tone (bù). Before another 4th tone syllable, it changes to 2nd tone (bú) — this is called tone sandhi. The character does not change in writing, only the pronunciation. You will see both bù and bú in pinyin depending on what follows.

Double negation

不是不... (bú shì bù...) is a common softening pattern meaning “it's not that I don't...” — used to explain or excuse, not to assert a positive. It does NOT mean a positive the way double negatives do in some dialects of English. The meaning stays negative but becomes more empathetic in tone.

Polite refusals

Several fixed 不 phrases function as polite social expressions. These are formulaic — do not try to construct them from rules, just learn each one as a set phrase.

Video Lesson