There are two common words used for negation in Mandarin Chinese: 不 (bù) and 没 (méi). While both mean “no” or “not,” the two are used in different ways when negating present, future, or past actions: 他 不 去看电影。. (Tā bù qù kàn diànyǐng.) He isn’t going to see the movie. 他 没 去看电影。. More @Wikipedia
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