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1、情态动词一、知识梳理/提炼1. can与could的用法表示能力或客观可能性，还可以表示请求与允许。如：Can you finish this work tonight?Man cannot live without air. Can I go now? Yes, you can.注意：could也可表示请求，语气委婉，主要用于疑问句，不可用于肯定句，答语应用can（即could不能用于现在时态的简略答语中）。如： Could I come to see you tomorrow? Yes, you can. （否定答语可用No, Im afraid not.） can表示能力时，还可用be
2、able to代替。如： Ill not be able to come this afternoon.2. may与might的用法1)表示许可。表示请求、允许时，might比may的语气更委婉一些，否定回答时要用mustnt表示“不可以”、“禁止”、“阻止”之意。如：You may drive the car. Might I use your pen? No, you cant/ mustnt. Yes, you can/may.用May I . 征询对方许可在文体上比较正式，在口气上比较客气。在日常口语中，用Can I . 征询对方意见在现代口语中更为常见。2) 用于祈使句中表示祝愿。
3、如：祝你成功！ May you succeed!3)表示推测、可能（疑问句不能用于此意）。他现在可能很忙。 He may be very busy now.3. must与have to的用法1) 表示必须、必要。如：You must come in time.回答must引出的问句时，如果是否定的回答，不能用mustnt，而要用neednt或dont have to。 Must we hand in our exercise books today? Yes, you must. No, you dont have to/neednt.2) “must be + 表语”的结构表示对现在的推测
4、，它的否定或疑问式用can代替must。 这肯定是你的笔吧。 This must be your pen.3) have to的含义与must相似，两者往往可以互换使用，但have to有各种形式，随have的变化而定。must与have to有下列几点不同： must表示的是说话人的主观看法，而have to则往往强调客观需要。如：The play is not interesting. I really must go now. 我现在必须得走了我在你这么大的时候必须得工作。 I had to work when I was your age. must一般只表现在，have to则有更多
5、的时态形式。 二者的否定意义不大相同。如：You mustnt go. 你不准去。 You dont have to go. 你不必去。4. need的用法1) need表示“需要”或“必须You neednt come so early. Need I finish the work today? Yes, you must/have to/should/ought to.2) need 也可以做实义动词，表示“需要”，人做主语时，为sb. need to do, 物做主语时为 sth. need doing 或 sth. need to be done.如：The garden needs
6、 watering/to be watered. I dont think you need to worry about this. 5. dare的用法1）dare作情态动词时，主要用于疑问句、否定句与条件从句中，一般不用在肯定句中。如：How dare you say Im unfair. He darent speak English before such a crowd, dare he?2）dare 可以做实义动词，敢;胆敢+to-v，如：He did not dare to leave his car there. 6. shall与should的用法1） shall用于第一、
7、第三人称疑问句中，表示说话人征求对方的意见或向对方请示。如：Shall we begin our lesson?When shall he be able to leave the hospital?2）shall用于第二、第三人称，表示说话人给对方命令、警告、允诺或威胁。如：You shall fail if you dont work harder. （警告）He shall have the book when I finish reading. （允诺） He shall be punished. （威胁）should的含义较多，用法较活，现介绍三种其特殊用法。请看下面的句子： I s
8、hould think it would be better to try it again. 我倒是认为最好再试一试。 You are mistaken, I should say. 依我看，你是搞错了。 I should advise you not to do that. 我倒是劝你别这样做。 This is something I should have liked to ask you. 这是我本来想问你的。从以上例句可以看出：情态动词should用于第一人称时可以表示说话人的一种谦逊、客气、委婉的语气。should还可以用在if引导的条件从句，表示一件事听起来可能性很小，但也不是完
9、全没有可能。相当于“万一”的意思。从句谓语should do，主句谓语却不一定用虚拟语气。如： 你万一见到她，请让她给我打个 。Ask her to ring me up if you should see her. 如果你万一改变主意，请让我们知道。 If you should change your mind, please let us know. Should I (If I should) be free tomorrow I will come. 此外，Why(or How) + should结构表示说话人对某事不能理解，感到意外、惊异等意思。意为“竟会”。如：你今天为何竟会来得这
10、么晚？Why should you be so late today? where is Betty living? 我怎么知道？ How should I know? 我真不知道你凭什么认为这件事是我干的。I dont know why you should think that I did it.7. will与would的用法1）表示请求、建议等，would比will委婉客气。如：Would you pass me the book?2）表示意志、愿望与决心。如：I will never do that again.They asked if we would do that again
11、.3）表料想或猜想。如：It would be about ten when he left home.What would she be doing there?I thought he would have told you all about it.8. ought to的用法1）ought to表示应该。如：You ought to take care of him. He ought to be home by now. 9. used to，had better，would rather的用法1）used to do过去常常做某事（现在已不做）当他小的时候他常常5点钟就起床。He
12、used to get up at 5 am when he was young.Be used to do 被用来做某事 be used to doing 习惯于做某事2）had better do意为“最好做某事”，后接不带to的不定式。如： We had better go now. Yes, we had (wed better / we had better).3）would rather do意为“宁愿做某事”，表选择。如：我宁愿现在什么也不说。 Id rather not say anything.你宁愿在农场工作吗？ Would you rather work on a far
13、m?10情态动词的现在完成式的用法情态动词现在完成式主要有两个功能：表示已经发生的情况与表示虚拟语气。在这两个方面must / mustnt; can / cant ; need / neednt; may / maynt; might / mightnt; should / shouldnt; ought等情态动词完成式表示的意思是有一定区别的表示已经发生的情况：1）“must + have + 过去分词”的结构常用在肯定句中，表示过去肯定应经发生过某事。它的否定或疑问式用can代替must。如：他一定是去过上海。 He must have been to Shanghai.2）may /
14、might have +过去分词，表示对已发生的事情做不肯定、可能性很小的推测，译为“过去也许发生过某事”。如：他可能已经把真相告诉他妻子了。He might have told his wife the truth.3）couldnt have done, 过去不可能做过某事。 He couldnt have done that.4）could have done 过去可能做过某事。表示虚拟语气1） neednt have + 过去分词，表示做了不必做的事，译为“本没必要做某事”。如：你本来不需要等我的。You neednt have waited for me. 2）should have
15、 +过去分词，表示应该做某事但实际上未做，译为“本应该做某事”；should not + have过去分词表示本不应该做某事但实际上做了，译为“本不应该某事”。如：我本来应该提前仔细地计划好一切的。I should have planned everything ahead carefully.我本来不应该对他态度那么不好的。 I shouldnt treated him so badly/ rudely.2） would + have + 过去分词表示过去本来会.(但没发生)，主要用于第二、三人称，表示对已经完成的动作或事态的推测。如：截止到那时，宾客们本来应该到了。 The guests
16、would have arrived by that time/by then.4）could have done, 过去本可能做某事但未做。我本来可以赢这个游戏的，但我后来决定让她赢。I could have won the game but decided to let her win.5）couldnt have done, 过去本不可能做成某事。要是没有你的帮助，我是不可能成功的。 Without your help, I couldnt have succeeded. 例题1. As it turned out to be a small house party, we _so fo
17、rmally. A. neednt dress up B. did not need have dressed upC. did not need dress up D. neednt have dressed up例题2. Mary_ my letter; otherwise she would have replied before now.A. couldnt have received B. ought to have receivedC. has received D. shouldnt have received例题3. _ you continue your effort and
18、 succeed!A. must B. can C. should D. may例题4. What does the sign over there read?No person_ smoke or carry a lighted cigarette, cigar or pipe in this area.A. will B. may C. shall D. must例题5. You _ washed so many clothes, well have a washing machine tomorrow.A. must have B. neednt C. neednt have D. co
19、uldnt have 巩固练习1 I _like to make a suggestion.A) could B) would C) must D) might2. Johns score on the test is the highest in the class; he_ last night.A) should study B) should have studiedC) must have studied D) must have to study3. The room is in a terrible mess; it _cleaned. (CET-4)A) cant have b
20、een B) shouldnt have beenC) mustnt have been D) wouldnt have been4. Nobody knows how people first came to these islands. They _ from South America on rafts.A) must have sailed B) can sailC) might have sailed D) should have sailed5.Mary was not in her bedroom yesterday afternoon. She _ in her classro
21、om.A) should have been B) must have beenC) must be D) should be6.As he had heart attack, he was told that he _ continue the work.A) neednt B) may not C) mustnt D) cant7.You_ to town to see the film yesterday. It will be on TV tonight.A) neednt go B) had better not goC) should not go D) neednt have g
22、one8.We_ the letter yesterday, but it didnt arrive.A) must receive B) ought to receiveC) must have received D) ought to have received9. With all the work on hand, he_ to the cinema last night.A) mustnt go B) shouldnt have gone C) could not go D) couldnt have gone10. Eve was late for class again. She
23、 _earlier.A) should get up B) must get upC) need to get up D) should have got up11.I am feeling sick. I_ so much chocolate.A) neednt have eaten B) couldnt have eaten C) mustnt have eaten D) shouldnt have eaten12. The road was muddy. It_last night.A) must rained B) must have rainedC) must be rained D
24、) could have rained13. I know things are hard with you, but you _try to get over the difficulties.A) can B) may C) must D) ought14.You should bear in mind that he is not so strong as he_.A) was used to be B) used to beC) was used to D) use to15. Mary _my letter, otherwise she would have replied befo
25、re now.A) should have received B) has receivedC) couldnt have received D) ought to have received16. I _ you a valuable present for your birthday, but I was short of money. A) would have liked to give B) liked to give C) have liked to give D) would like to give17.“Where _ my umbrella?” “Somebody _ it
26、 away by mistake.”A) is, must have taken B) is, must takeC) have been, must take D) is, takes18. Tom _ better than to ask Dick for help.A) shall know B) shouldnt know C) has known D) should have known19.You _ your tooth pulled out before it rot completely.A) had better got B) had to get better C) had better to get D) had better get20. When we got to the cinema, the film hasnt started yet, so we _.A) neednt hurry B) didnt need hurryC) neednt to hurry D) neednt have hurried例一-例五 DADCC BCACB CDDBD DBCBC AADDD 第 8 页