The Fast Rule

Word	Pinyin	Main Use	Easy Meaning
不	bù	present, future, habits, descriptions	not / do not / will not
没	méi	past actions, non-existence with 有 yǒu	did not / have not / do not have
没有	méiyǒu	full form with 有 yǒu	do not have / there is not

Core Rule One: Use 不 bù For Present, Future, And Habit

不 bù is the default negation for things that are generally true, true right now, or expected in the future.

Useful Patterns With 不 bù

Pattern	Meaning	Example (ZH)	Example (Pinyin)	Translation
不 + verb	do not / will not	我不吃肉。	Wǒ bù chī ròu.	I do not eat meat.
不 + adjective	not + description	这个不贵。	Zhège bù guì.	This is not expensive.
不 + like / want	do not want / do not like	我不想等。	Wǒ bù xiǎng děng.	I do not want to wait.
不 + future action	will not	明天我不出门。	Míngtiān wǒ bù chūmén.	I will not go out tomorrow.

Core Rule Two: Use 没 méi For Past Actions That Did Not Happen

If an action did not happen, use 没 méi. This is the beginner shortcut that saves lives. Or at least conversations.

You will often hear 没 méi before a verb without any extra grammar clutter. Nice and efficient.

Pattern	Meaning	Example (ZH)	Example (Pinyin)	Translation
没 + verb	did not do	我没买。	Wǒ méi mǎi.	I did not buy it.
没 + verb + object	did not do something	他没写作业。	Tā méi xiě zuòyè.	He did not do homework.
还没 + verb	have not yet	我还没下班。	Wǒ hái méi xiàbān.	I have not gotten off work yet.
从来没 + verb	have never	我从来没去过北京。	Wǒ cónglái méi qùguo Běijīng.	I have never been to Beijing.

Core Rule Three: Use 没有 méiyǒu With 有 yǒu

When the verb is 有 yǒu, meaning to have, the negative is usually 没有 méiyǒu, not 不有 bù yǒu.

Useful Patterns With 没有 méiyǒu

Pattern	Meaning	Example (ZH)	Example (Pinyin)	Translation
没有 + noun	do not have	我没有车。	Wǒ méiyǒu chē.	I do not have a car.
没有 + person	there is no one	这里没有老师。	Zhèlǐ méiyǒu lǎoshī.	There is no teacher here.
没有 + time / chance	do not have time / chance	我没有机会。	Wǒ méiyǒu jīhuì.	I do not have a chance.
没有 + verb? no	usually use 没 méi before the verb instead	我没去。	Wǒ méi qù.	I did not go.

Rule Four: Adjectives Usually Take 不 bù, Not 没 méi

When you want to say something is not big, not expensive, not happy, not easy, use 不 bù.

• 不大 bù dà — not big
  这个房间不大。
  Zhège fángjiān bù dà.
  This room is not big.
• 不贵 bù guì — not expensive
  这个不贵。
  Zhège bù guì.
  This is not expensive.
• 不高兴 bù gāoxìng — not happy
  他今天不高兴。
  Tā jīntiān bù gāoxìng.
  He is not happy today.
• 不难 bù nán — not difficult
  这个问题不难。
  Zhège wèntí bù nán.
  This question is not difficult.

Beginners often say 没贵 méi guì or 没高兴 méi gāoxìng. That sounds off. Stick with 不 bù for adjectives.

Rule Five: Future Refusal Uses 不 bù, Not 没 méi

If you are refusing something, declining a plan, or saying what you will not do, use 不 bù.

• 我不去。 Wǒ bù qù. — I am not going.
• 我不买。 Wǒ bù mǎi. — I will not buy it.
• 我不想吃。 Wǒ bù xiǎng chī. — I do not want to eat.
• 他不来。 Tā bù lái. — He is not coming.

Compare that with past time:

• 我没去。 Wǒ méi qù. — I did not go.
• 我没买。 Wǒ méi mǎi. — I did not buy it.
• 我没吃。 Wǒ méi chī. — I did not eat.
• 他没来。 Tā méi lái. — He did not come.

Bu 不 bù Vs Mei 没 méi In Real-Life Pairs

With 不 bù	Meaning	With 没 méi	Meaning
我不去。 Wǒ bù qù.	I am not going / I will not go.	我没去。 Wǒ méi qù.	I did not go.
我不吃。 Wǒ bù chī.	I do not eat it / I will not eat it.	我没吃。 Wǒ méi chī.	I did not eat.
他不忙。 Tā bù máng.	He is not busy.	他没来。 Tā méi lái.	He did not come.
我不喜欢茶。 Wǒ bù xǐhuan chá.	I do not like tea.	我没喝茶。 Wǒ méi hē chá.	I did not drink tea.
我不买。 Wǒ bù mǎi.	I will not buy it.	我没买。 Wǒ méi mǎi.	I did not buy it.

Mini Word Bank You Will Actually Use

Common Mistakes And Fixes

Practice Section

Pick 不 bù or 没 méi.

• 我昨天 ___ 看电影。
  Wǒ zuótiān ___ kàn diànyǐng.
  I did not watch a movie yesterday.
• 我 ___ 喜欢辣的。
  Wǒ ___ xǐhuan là de.
  I do not like spicy food.
• 他今天 ___ 来。
  Tā jīntiān ___ lái.
  He is not coming today.
• 我们还 ___ 吃饭。
  Wǒmen hái ___ chīfàn.
  We have not eaten yet.
• 我 ___ 有车。
  Wǒ ___ yǒu chē.
  I do not have a car.

Show Answers

• 我昨天没 méi看电影。
  Wǒ zuótiān méi kàn diànyǐng.
• 我不 bù喜欢辣的。
  Wǒ bù xǐhuan là de.
• 他今天不 bù来。
  Tā jīntiān bù lái.
• 我们还没 méi吃饭。
  Wǒmen hái méi chīfàn.
• 我没 méi有车。
  Wǒ méiyǒu chē.

Quick Reference Summary

• Use 不 bù for present facts, future plans, habits, preferences, and adjectives.
• Use 没 méi for past actions that did not happen.
• Use 没有 méiyǒu with 有 yǒu to mean do not have.
• Use 还没 hái méi for not yet.
• Do not use 不 bù with 有 yǒu.
• Do not usually use 没 méi with adjectives like 贵 guì or 忙 máng.

FAQ

Can 没 méi mean “not” in the present?

Yes, sometimes. In everyday speech, 没空 méi kòng means not free, and 没事 méi shì means it is okay or no problem. But for beginners, the safer core rule is still: 没 méi for past actions and 没有 méiyǒu for do not have.

Why does 不 become bú in 不是 bú shì?

The tone changes before another fourth-tone syllable. So 不 bù becomes bú in words like 不是 bú shì. Same word, smoother pronunciation, less mouth drama.

Is 没有 méiyǒu always better than 没 méi?

Not always. Use 没有 méiyǒu with 有 yǒu and nouns, such as 我没有时间 Wǒ méiyǒu shíjiān. For past actions, simple 没 méi is usually enough, such as 我没去 Wǒ méi qù.

Mastering 不 bù and 没 méi is one of those beginner wins that makes your Chinese sound instantly less translated and much more natural. Tiny grammar point, very real payoff.