what is the difference between 不 and 没有？ 不 (bù) and 没有 (méi yǒu) are both negation words in Chinese, but they are used in slightly different ways. 不 (bù) is an adverb that negates the verb or adjective that follows it. It is used to express "not" or "no." For example: 我不喜欢吃苹果 (wǒ bù xǐ huān chī píng guǒ) - I don't like eating apples 他不是医生 (tā bù shì yī shēng) - He is not a doctor 没有 (méi yǒu) is used to negate the verb in the past tense or to express "not have." It is often used in combination with a verb in the past tense to indicate that something did not happen. For example: 我没有吃早饭 (wǒ méi yǒu chī zǎo fàn) - I didn't eat breakfast 他没有去过北京 (tā méi yǒu qù guo běi jīng) - He has not been to Beijing