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情态动词can,must,may

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动词分类

  1. 连系动词 (Linking verbs):表示状态、性质或身份的动词,用来连接主语和表语。
  2. 情态动词 (Modal verbs):表示情感、态度、能力或推测等含义的动词。
  3. 实义动词 (Main verbs):表示具体行为或状态的动词,承载动作的核心含义。
  4. 助动词 (Auxiliary verbs):与其他动词搭配使用,用来构成时态、语态、否定和疑问等结构。

情态动词

概念:表示情感、态度,包括:can(could), must, may(might), will (would) ...
  • You must go out! 你必须出去!
  • Can you please stand up? 请你站起来好吗?

用法:+ 动词,且原形

  • He can do/read it. 他能做/读它。

没有人称和数的变化

人称 Be动词 情态动词
She She is... She can...
He He is... He can...
It It is... It can...
I I am... I can...
They They are... They can..

一般疑问句:情态动词提前

陈述句 一般疑问句 回答
He can read it. Can he read it? Yes, he can.
He can do it. Can he do it? Yes, he can.

情态动词的否定句:

  • can → can't(不可用 can not)
  • can → cannot 要连在一起不能分开
  • must → mustn't (表:禁止,绝对不允许) 使用don't need to 替代
  • may → may not(要分开)
原句 变为一般疑问句 变为否定句
Tom can swim well. Can Tom swim well? Tom can't/cannot swim well.
The students must finish their homework tonight. Must the students finish their homework tonight? The students don't need to finish their homework tonight.
I can stay with you. Can I stay with you? I can't/cannot stay with you.
She can drive to school. Can she drive to school? She can't/cannot drive to school.