A2 Intermediate Negation

不 vs 没 (bù vs méi): Which Negative to Use

Chinese has two words for “not” — 不 (bù) and 没 (méi) — and they're not interchangeable. The key is time: 不 negates the present and future; 没 negates the past and completion.

Why this trips learners up

Chinese has two everyday words for “not” — 不 (bù) and 没 (méi) — and they are not interchangeable. Picking the wrong one is one of the most common beginner mistakes, so the question “不 or 没?” is worth settling early. The good news: one idea sorts out almost every case — time.

不 is the negator of the present and future: choices and intentions (“I'm not going”), habits (“I don't eat meat”), and plain descriptions with adjectives (“not cold”). 没 is the negator of the past and completion: something that didn't happen or hasn't happened yet (“I didn't go”, “he hasn't arrived”). Two fixed rules finish the core: only 没 negates 有 (没有 = “don't have”, never 不有), and only 没有 makes the “not as … as” comparison. (One catch: a few verbs — 是, 在, 知道 — keep 不 even about the past.) Get the time straight and the right negator follows.

The structure

Subject 不 / 没 bù / méi Verb

Colour key

Each colour marks one grammatical role — and the same colour means the same role on every page in the Lab.

Pattern Subject Verb Object Time Adverb Adjective

Examples in context

Real-world sentences, easiest first. Toggle pinyin or the translation, tap any word to see its role, or play the audio.

Tap a word to see its grammatical role.

zhège wèntí 这个问题 Subject bù 不 Pattern nán 难 Adjective

This question isn't hard.

wǒ 我 Subject bù 不 Pattern hē 喝 Verb kāfēi 咖啡 Object

I don't drink coffee.

wǒmen 我们 Subject jīnwǎn 今晚 Time bù 不 Pattern chūqù 出去 Verb

We're not going out tonight.

wǒ 我 Subject zuótiān 昨天 Time méi 没 Pattern shàngbān 上班 Verb

I didn't go to work yesterday.

tā 他 Subject hái 还 Adverb méi 没 Pattern qǐchuáng 起床 Verb

He hasn't gotten up yet.

wǒ 我 Subject méiyǒu 没有 Pattern shíjiān 时间 Object

I don't have time.

wǒ 我 Subject méiyǒu 没有 Pattern nǐ 你 Object máng 忙 Adjective

I'm not as busy as you.

wǒ 我 Subject zuótiān 昨天 Time bù 不 Pattern zhīdào 知道 Verb

I didn't know (about it) yesterday.

Common mistakes

Avoid: 我昨天不去。 wǒ zuótiān bú qù.

Say this: 我昨天没去。 wǒ zuótiān méi qù.

Why it happens: A finished, past action is negated with 没, not 不. “I didn't go yesterday” is 我昨天没去 — the time word 昨天 tells you it's the past, so 不 is wrong here. Whenever you mean something simply didn't happen, reach for 没.

Avoid: 我不有车。 wǒ bù yǒu chē.

Say this: 我没有车。 wǒ méiyǒu chē.

Why it happens: 有 (“to have”) is the one verb 不 can never touch — you always negate it with 没: 我没有车 (“I don't have a car”), never 我不有车. Lock in 没有 as a fixed pair.

Avoid: 我明天没来。 wǒ míngtiān méi lái.

Say this: 我明天不来。 wǒ míngtiān bù lái.

Why it happens: Pointed the other way: a future or habitual “not” takes 不, not 没. “I'm not coming tomorrow” is 我明天不来 — 明天 is the future, and 没 only covers the past. If time hasn't put it in the past, it's 不.

Compare & contrast

不 (bù) — won't / don't (now & future)	没 (méi) — didn't / haven't (past)	The difference
我不去。wǒ bú qù.	我没去。wǒ méi qù.	我不去 = “I'm not going / I won't go” — a present choice or a future plan. 我没去 = “I didn't go” — it simply didn't happen.
她不来。tā bù lái.	她没来。tā méi lái.	她不来 = “she isn't coming / won't come”. 她没来 = “she didn't come / hasn't come”. Same verb, opposite time.

Rule of thumb不 negates the present and future — choices, habits, states and adjectives (“won't / don't / not”). 没 negates the past and completion — what didn't happen or hasn't happened yet (“didn't / haven't”). And keep the two fixed rules: 有 is always 没有 (never 不有), and “not as … as” comparisons use 没有 only.

Try it yourself

Say “I didn't watch TV yesterday” — tap the words into order.

Related patterns

Quick reference card

不 vs 没 (bù vs méi): Which Negative to Use grammar.merrymandarin.com

A pocket summary — print it and keep it by your desk.

Structure

Subject + 不 / 没 + Verb

Example

这个问题不难

This question isn't hard.

Watch out

✗ 我昨天不去。 → ✓ 我昨天没去。