情态动词的用法总结(2)

学习啦在线学习网 　　2) must have+done sth., 表示对过去时间里可能发生的事情的推测,语气较强,具有“肯定”的意思。

　　e.g. --- Linda has gone to work, but her bicycle is still here.

学习啦在线学习网 　　--- She must have gone by bus.

学习啦在线学习网 　　3) ought to have done sth.\should have done sth.本应该做某事,而事实上并没有做; 否定句表示“不该做某事而做了”。

　　e.g. You ought to (should) have been more careful in this experiment.

　　He ought not to have thrown the old clothes away.(事实上已扔了。)

　　注: ought to 在语气上比should 要强。

　　4) needn’t have done sth. 本没必要做某事

　　e.g. I dressed very warmly for the trip, but I needn’t have done so. The weather was hot.

　　5) would like to have done sth. 本打算做某事

　　e.g. I would like to have read the article, but I was very busy then.

　　7. 情态动词should和ought to

　　should 和ought to 都为“应该”的意思,可用于各种人称。

学习啦在线学习网 　　e.g. --- Ought he to go?

　　--- Yes. I think he ought to.

学习啦在线学习网 　　表示要求,命令时,语气由 should(应该)、(had better最好)、must(必须) 渐强。

　　8. 情态动词had better表示“最好”

学习啦在线学习网 　　had better 相当于一个助动词,它只有一种形式,它后面要跟动词原形。

学习啦在线学习网 　　had better (not) do sth.

　　e.g. It is pretty cold. You’d better put on my coat.

　　She’d better not play with the dog.

　　had better have done sth.

　　表示与事实相反的结果,意为“(过去)本来最好”。

学习啦在线学习网 　　e.g. You had better have come earlier.

　　9. 情态动词would rather表示“宁愿”

　　would rather (not) do

学习啦在线学习网 　　would rather…than…宁愿…而不愿

　　would sooner\ had rather\ had sooner表示"宁愿"、"宁可"的意思。

　　e.g. If I have a choice, I had sooner not continue my studies at this school.

　　10. will和would

学习啦在线学习网 　　1) would like to do = want to 想要

　　e.g. Would you like to go with me?

学习啦在线学习网 　　2) Will you…? / Would you like…?

　　表示肯定含义的请求劝说时,疑问句中一般用some, 而不是any。

　　e.g. Would you like some cake?

学习啦在线学习网 　　3) 否定结构中用will, 一般不用would, won’t you是一种委婉语气。

　　e.g. Won't you sit down?

　　11. need和dare

　　这两词既可做实义动词用,又可做情态动词用。作为情态动词,两者都常用于疑问句,否定句和条件句。并注意回答用need 提问的句子时，肯定回答用must。

学习啦在线学习网 　　need 作实义动词时后面的不定式必须带to,而dare作实义动词用时, 后面的to时常可以被省略。

学习啦在线学习网 　　1) 实义动词: need+ n. / to do sth.

学习啦在线学习网 　　2) 情态动词: need,只用原形need后加do,否定形式为need not.

学习啦在线学习网 　　e.g. ---- Need you go yet?

　　---- Yes, I must. / No, I needn't.

学习啦在线学习网 　　3) need, want, require, worth(形容词)后面接doing也可以表示被动。

学习啦在线学习网 　　need doing = need to be done

　　Exercises

学习啦在线学习网 　　1. A left-luggage office is a place where bags ____be left for a short time, especially at a railway station.

　　A. should B. can

　　C. must D. will (B)

　　2. How ___ you say that you really understand the whole story if you have covered only part of the article?

　　A. can B. must

　　C. need D. may (A)

　　3. — The room is so dirty. ___we clean it?

　　— Of course.

　　A. Will B. Shall C. Would D. Do (B)

学习啦在线学习网 　　4. My English-Chinese dictionary has disappeared. Who ___ have taken it?

　　A. should B. must

　　C. could D. would (C)

　　5. — Is John coming by train?

学习啦在线学习网 　　— He should, but he ____ not. He likes driving his car.

学习啦在线学习网 　　A. must B.can

　　C. need D.may (D)

　　6. — I heard they went skiing in the mountains last winter.

学习啦在线学习网 　　— It ____ true because there was little snow there.

　　A. may not be B. won’t be

　　C. couldn’t be D. mustn’t be (C)

学习啦在线学习网 　　7. It has been announced that candidates __ remain in their seats until all the paper have been collected.

　　A. can B. will C. may D. shall (D)

　　8. — I hear you’ve got a set of valuable Australian coins. ___ I have a look?

　　—Yes, certainly.

　　A. Do B. May C. Shall D. shall (B)

学习啦在线学习网 　　9. Oh, I’m not feeling well in the stomach, I ___ so much fried chicken just now.

学习啦在线学习网 　　A. shouldn’t eat

　　B. mustn’t have eaten

学习啦在线学习网 　　C. shouldn’t have eaten

学习啦在线学习网 　　D. mustn’t eat (C)

　　10. I was really anxious about you. You ___ home without a word.

学习啦在线学习网 　　A. mustn’t leave

学习啦在线学习网 　　B. shouldn’t have left

　　C. couldn’t have left

　　D. needn’t leave (B)