1. Meaning and Usage
"不" (bù) is a fundamental negative adverb in Chinese, meaning "not," "no," or "do not." It is primarily used to negate verbs and adjectives, expressing simple negation, denial of facts, habitual non-occurrence, or future actions/intentions. It signifies a current state or a general truth, rather than the non-completion of a past action.
2. Formulas and Examples
Case 1: Negating a Simple Verb
Used to negate a single verb, expressing that an action is not performed or an intention is absent.
$$不 + Verb$$
我 不 去。 Wǒ bù qù. I don't go / I'm not going.
他 不 喜欢 吃 苹果。 Tā bù xǐhuān chī píngguǒ. He doesn't like to eat apples.
Case 2: Negating an Adjective
Used to negate an adjective, expressing that a quality or state is not present.
$$不 + Adjective$$
这个 菜 不 好吃。 Zhège cài bù hǎochī. This dish is not delicious.
今天 天气 不 冷。 Jīntiān tiānqì bù lěng. The weather today is not cold.
Case 3: Negating '是' (to be)
Used to negate the verb "是" (shì), meaning "to be," to deny identity or classification.
$$不 + 是 + Noun / Noun Phrase$$
我 不 是 学生。 Wǒ bù shì xuéshēng. I am not a student.
那 不 是 我 的 手机。 Nà bù shì wǒ de shǒujī. That is not my phone.
Case 4: Negating a Verb-Object Phrase
When a verb has an object, "不" is placed directly before the verb to negate the entire action.
$$不 + Verb + Object$$
她 不 喝 牛奶。 Tā bù hē niúnǎi. She doesn't drink milk.
我们 不 看 电视。 Wǒmen bù kàn diànshì. We don't watch TV.
Case 5: Negating Future Actions or Habitual Non-occurrence
"不" is commonly used to negate actions that will not happen in the future or actions that do not happen habitually.
$$(Time/Frequency Adverb) + 不 + Verb$$ (The Time/Frequency Adverb can also precede "不")
我 明天 不 上班。 Wǒ míngtiān bù shàngbān. I'm not going to work tomorrow.
他 早上 不 跑步。 Tā zǎoshang bù páobù. He doesn't run in the morning (habitually).
3. Essential HSK Tips & Common Mistakes
Tip 1: "不" vs. "没(有)" - The Crucial Distinction for Tense and Aspect
This is the most frequent point of confusion for English speakers.
- 不 (bù) : Negates current states, habitual actions, future actions, or intentions. It does not imply completion.
- 没(有) (méi[yǒu]) : Negates completed actions in the past or existence/possession.
我 不 去。 Wǒ bù qù. I'm not going (e.g., tomorrow, or I don't want to go).
我 昨天 没 去。 Wǒ zuótiān méi qù. I didn't go yesterday (completed action in the past).
我 没有 钱。 Wǒ méiyǒu qián. I don't have money (negates existence/possession).
Mistake 1: Using "不" for Completed Past Actions
A common mistake is using "不" to negate an action that occurred (or rather, didn't occur) in the past.
- Incorrect: 我昨天不吃饭。(Wǒ zuótiān bù chīfàn.)
- Correct:
我 昨天 没 吃饭。 Wǒ zuótiān méi chīfàn. I didn't eat yesterday.
Tip 2: Placement with Adverbs of Degree
When negating an adjective that might otherwise be preceded by an adverb of degree (like 很 hěn "very" or 太 tài "too"), "不" comes before the adverb of degree. However, often the adverb of degree is simply omitted when negated.
这件 衣服 不 太 贵。 Zhè jiàn yīfu bù tài guì. This piece of clothing is not too expensive.
(Note: "不很贵" (bù hěn guì) is grammatically correct but less common than "不太贵" or simply "不贵".)
Tip 3: Rhetorical Questions with "不...吗?"
"不" can be used in rhetorical questions, often to express surprise or to expect an affirmative answer.
你 不 知道 吗？ Nǐ bù zhīdào ma? Don't you know? (Implying that you should know.)
他 不 是 中国人 吗？ Tā bù shì Zhōngguórén ma? Isn't he Chinese? (Implying that he is Chinese.)