情态助动词用法

时间:2022-05-27 07:36:29 基础英语 我要投稿
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情态助动词用法

  情态动词是英语学习的又一大重点,各位学习者们一定要记得反复复习啊,这一次小编为大家讲解剩下的情态助动词的用法。

  dare, need

  ① dare作情态动词用时, 常用于疑问句、否定句和条件从句中, 过去式形式为dared。

  eg. How dare you say such horrible words to me?

  ② need 作情态动词用时, 常用于疑问句、否定句,相当于肯定句中一般用must, have to, ought to, should。

  eg.  Need I finish the work today?

  Yes, you must. / No, you needn’t.

  ③ dare和 need作实义动词用时, 有人称、时态和数的变化,在肯定句中,dare后面常接带to的不定式,在疑问句和否定句中,dare后面可接带to或不带to的不定式,而need后面只能接带to的不定式。

  eg. She doesn’t dare (to)answer.

  She needs to cook dinner for her sisters.

  shall, should

  ① shall 用于第一人称,征求对方的意见。

  eg. What shall I do ?

  ② shall 用于第二、三人称,表示说话人给对方的命令、警告、允诺或威胁。

  eg. You shall be punished,you bad boy!

  六. will, would

  ① 表示请求、建议等,使用would使语气更加缓和。

  eg. Would you give me a cup of coffee, please?

  ② 表示意志、愿望和决心。

  eg. I will never do that again.

  ③ would表示过去反复发生的动作或某种倾向。

  eg. During that summer, he would visit me every other day.

  ④ 表示估计和猜想。

  eg. It would be about may when she come back to China.

  should, ought to

  ① should表示“应该”,ought to表示义务或责任,语气更严重。

  eg. I should help her because she is in trouble.

  You ought to take care of her because she is your daughter.

  ② 表示劝告、建议和命令,should, ought to可通用,但在疑问句中常用should。

  eg.Should I open the window?

  ③ 表示推测, should , ought to (客观推测), must(主观推测)。

  eg. She must pass the exam. (断定)

  She ought to/should pass the exam.(不太肯定)

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