- (often reduced to n't)
used with be, do or have to form the negative of verbs; used to form the negative of modal verbs like can or must （构成动词 be、do 和 have 及情态动词 can 或 must 等的否定形式，常缩略为 n't）不，没有 -
used to give the following word or phrase a negative meaning, or to reply in the negative （否定后面的词或短语，或作否定的回答）不，没有 He warned me not to be late. 他提醒我不要迟到。 I was sorry not to have seen them. 我很遗憾没有见到他们。 Not everybody agrees. 不是每一个人都同意。 They had still not decided. 他们还没有决定。 ‘Who's next?’ ‘Not me.’ “下一位是谁？” “不是我。” ‘What did you do at school?’ ‘Not a lot.’ “你在学校干什么了？” “没做多少事。” It's not easy being a parent (= it's difficult). 为人父母真不容易啊。 It's not every day you get to meet a famous actor. 不是每天都能见到著名演员的。
-
used after hope, expect, believe, etc. to give a negative reply （用于 hope、expect、believe 等动词后，作为否定的回答）不，没有 - or not
used to show a negative possibility （表示否定的可能性）否，或许不 -
used to say that you do not want something or will not allow something （拒绝或不允许）不 even less than 不： 甚至小于She was standing not three feet in front of me. 她站在我前面不到三英尺的地方。
used to suggest that the opposite of the following word or phrase is true （否定后面的词或短语，或作否定的回答）不，没有 This could all happen in the not too distant future (= soon). 这一切都可能在不远的将来发生。 His view on the matter was not a million miles away from (= close to) mine. 他对这件事的看法与我相差不远。
- (humorous, informal)
used to emphasize the opposite of a statement 不仅…而且… Well, that sounds like a fun evening—not! 嗯，那听起来像是一个有趣的夜晚——不！
Word OriginMiddle English: contraction of the adverb nought.
Idioms
not a…
(also not one…)
not at all
used to politely accept thanks or to agree to something （礼貌地答谢或同意）别客气，没关系，没什么 ‘Thanks a lot.’ ‘Not at all.’ “非常感谢。” “不客气。” ‘Will it bother you if I smoke?’ ‘Not at all.’ “我抽烟你介意吗？” “没关系。”
not only… (but) (also)…
not that