否定副词「不」 fǒudìng fùcí "bù"
否定副词「不」（fǒudìng fùcí "bù"）means “不 + verb/adjective: general negation (don't / not)”. 不 negates verbs and adjectives for the present, future, or habits (我不喝咖啡 'I don't drink coffee'). Formation: 不 + 动词/形容词（一般否定）
不 + verb/adjective: general negation (don't / not)
HSK1Formation
不 + 动词/形容词（一般否定）
Explanation
不 negates verbs and adjectives for the present, future, or habits (我不喝咖啡 'I don't drink coffee'). Its citation tone is 4th (bù), but before another 4th tone it changes to 2nd (bú): 不是 = búshì. Exception: to negate a completed action, use 没, not 不.
Examples
Note
Tone sandhi: 不 + 4th tone → bú (不是 búshì). Completed action → 没.
FAQ
否定副词「不」 — what does it mean and how is it used?
不 + verb/adjective: general negation (don't / not). 不 negates verbs and adjectives for the present, future, or habits (我不喝咖啡 'I don't drink coffee'). Its citation tone is 4th (bù), but before another 4th tone it changes to 2nd (bú): 不是 = búshì. Exception: to negate a completed action, use 没, not 不.
否定副词「不」 — how do you form it?
不 + 动词/形容词（一般否定）
否定副词「不」 — any usage notes?
Tone sandhi: 不 + 4th tone → bú (不是 búshì). Completed action → 没.