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not

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音标发音

  • 英式音标 [nɒt]
  • 美式音标 [nɑːt]
  • 英式发音
  • 美式发音

基本解释

  • adv. 表示否定，不
  • n. “非”（计算机中逻辑运算的一种）

词源解说

  • 13世纪中期进入英语，直接源自古英语的noht，意为无。

同根派生

     

用法辨析

    adv. (副词)

  • not的基本意思是“不,没有”,通常用于否定句中,位于动词be、have/has或情态动词之后,或与之一起构成缩写形式; 如:isn't, don't, won't等。
  • 在美国口语中常用ain't代替am not/are not/is not/has not/have not。
  • not后可接动词的非限定形式:动词不定式、动名词或分词。
  • 在复合句中常可将not置于主语的谓语动词之前,而不放在从句中,这称之为转移否定。
  • not可用于省略结构中,代替词、词组或整个句子。在一些动词(如think, believe等)、副词(如probably等)和词组(如be afraid等)之后,可用not代替否定从句。
  • not还可否定形容词和副词,用于表示委婉的语气。
  • not与all, both, every, always等词连用时表示部分否定。
  • 为了加强语气,可以把not构成的否定的状语等置于句首,并引起主谓倒装。

英汉例句

    用作副词 (adv.)

  • She did not see him.
    她没看见他。

词组短语

    短语

  • not null 非空;非空约束;不为空;不能为空
  • Not see 不见;看不见;看不得;悠久不见
  • Not really 算不上;也不是;不完全是;不尽然
  • Not worth 不值;不值得;不足;不必
  • Not optimistic 不容乐观

英英字典

    剑桥英英字典

  • used to form a negative phrase after verbs like "be", "can", "have", "will", "must", etc., usually used in the short form "n't" in speech

    • 柯林斯英英字典

  • You use not with verbs to form negative statements.
  • You use not to form questions to which you expect the answer "yes."
  • You use not, usually in the form n't, in questions which imply that someone should have done something, or to express surprise that something is not the case.
  • You use not, usually in the form n't, in question tags after a positive statement.
  • You use not, usually in the form n't, in polite suggestions.
  • You use not to represent the negative of a word, group, or clause that has just been used.
  • You can use not in front of "all" or "every" when you want to say something that applies only to some members of the group that you are talking about. (every)
  • If something is not always the case, you mean that sometimes it is the case and sometimes it is not.
  • You can use not or not even in front of "a" or "one" to emphasize that there is none at all of what is being mentioned.
  • You can use not in front of a word referring to a distance, length of time, or other amount to say that the actual distance, time, or amount is less than the one mentioned.
  • You use not when you are contrasting something that is true with something that is untrue. You use this especially to indicate that people might think that the untrue statement is true.
  • You use not in expressions such as "not only," "not just," and "not simply" to emphasize that something is true, but it is not the whole truth. (not only##not)(not just##not)(not simply##not)
  • You use not that to introduce a negative clause that contradicts something that the previous statement implies.
  • Not at all is an emphatic way of saying "No" or of agreeing that the answer to a question is "No."
  • Not at all is a polite way of acknowledging a person's thanks.
  • not half&rarrsee half
  • if not&rarrsee if
  • more often than not&rarrsee often

专业释义

    计算机科学技术

  • “非”
  • 逻辑非
  • 非
  • 反
  • 反电路

    • 电子、通信与自动控制技术

  • 非门
  • 告知信息