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情态动词语法知识总结

  一、may和might   ★ 都可表示允许。如:   You may / might use my dictionary so long as you return it b…

  一、may和might

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  ★ 都可表示允许。如:

  You may / might use my dictionary so long as you return it before
17:00.

  ★ 表示可能,might比may语气更不确定,表示的可能性更小。如:

  Do you think Mr. Jackson may / might be here on time?

  二、can和could

  ★ 都可表示能力。如:

  Even a small personal computer can store great amounts of information.

  I couldn’t get tickets; they were sold out.

  ★ 也可表示许可,could比can表示的说话语气更委婉。如:

  You can have my seat. I’m going now.

  Could I have a drink of water, please?

  ★ 还可表示说话人的猜测,此时could不是can的过去式,它表示推测的可能性比can小。如:

  Can he still be alive after all this time?

  If you’re not careful, you could get into even worse trouble.

  三、will和would

  ★ 可表示意愿,will表示现在的意愿,有时可用于条件句中,would表示过去的意愿(would如表示现在的意愿,语气较委婉)。如:

  Ask, if you will, who the owner is.

  My friend asked if I would go with him.

  ★ 都可表示征求意见或提出请求。如:

  Will / Would you please make a cup of coffee for me?

  ★ 也都可表示习惯和倾向性,will表示现在的习惯,would表示过去的习惯。如:

  These clothes won’t wash easily.

  When Ann was a child, she would often ask some strange questions.

  四、shall和should

  ★
shall在疑问句中用于征求对方意见,主要用于第一人称,也可用于第三人称,意为“要不要,……好吗”;shall在陈述句中表示说话者的允诺、告诫、威胁、命令、规定、必然性等,主要用于第二人称或第三人称。如:

  Shall we go out and have a walk after dinner?

  Shall my sister come here now?

  You shall do as you see me do.

  Tell Betty that she shall have the bike tomorrow.

  ★ should表示义务或责任、建议或劝告、推断等。如:

  We should take good care of our children.

  You should give up smoking and drinking.

  With an early start the young men should be here by 10:00 am.

  五、must和can’t

  ★ must可表示“必须做某事”,还可表推测。如:

  All passengers must wear seat belts.

  Your father has worked hard all day. He must be tired.

  When you got lost in the forest, you must have been very frightened.

  ★ can’t可表否定的推测和判断,意为“不可能”。如:

  If Jim didn’t leave home until six o’clock, he can’t be at the office
yet.

  Somebody must have opened the cage because the lion can’t have escaped on
its own.

  以上就总结这么多,想要获取更多的英语学习资料,可以关注阿卡索外教网的官网,也可以去相应的在线英语学习网站上多了解一下。

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