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1、情 态 动 词 的 定 义,情态动词是一种本身有一定的词义，表示说话人的情绪、态度或语气的动词，但不能单独作谓语，只能和其他动词原形构成谓语。 We can be there on time tomorrow. May I have your name? Shall we begin now? You must obey the school rules.,情态动词数量不多，但用途广泛，主要有下列： can (could), may (might), must, need, ought to, dare (dared), shall (should), will (would) .,情 态 动
2、 词 的 位 置,情态动词在句中放在谓语动词之前，谓语动词前若有助动词，则在助动词之前，疑问句中，情态动词放在主语之前。 I can see you. Come here. He must have been away. What can I do for you? 你要什么？ How dare you treat us like that!,情 态 动 词 的 特 点,情态动词无人称和数的变化，情态动词后面跟的动词需用原形，否定式构成是在情态动词后面加“not”。个别情态动词有现在式和过去式两种形式，过去式可以用来表达更加客气、委婉的语气，时态性不强，可用于过去，现在或将来。 He coul
3、d be here soon. 他很快就来。 We cant carry the heavy box. Im sorry I cant help you.,情 态 动 词 的 用 法,1. can (could) 表示说话人“能, 可以, 同意, 准许”, 以及客观条件许可, could 为 can 的过去式。 Can you pass me the books? Could you help me, please? What can you do? 你能干点什么呢? Can you be sure? 你有把握吗?,can 和could 只能用于现在式和过去式两种时态，将来时态用be able
4、 to 来表示。be able to 还表示过去具有 某种能力并实施了。 He could help us at all. 他完全可以帮助我们。 With the teachers help, I shall be able to speak English correctly. 有老师的帮助, 我将能准确地讲英语。,2. may (might) “可以”，表示说话人同意，许可或请求对方许可。 You may take the book home. May I come in? 我可以进来吗? May I use your dictionary? You may put on more clo
5、thes. He said he might lend us some money. 他说他可以借给我们一些钱。,may 否定式为 may not, 缩写形式是 maynt。might 是may 的过去式，有两种用法，一种表示过去式，一种表示虚拟语气，使语气更加委婉、 客气或对可能性的怀疑。 He told me he might be here on time. Might I borrow some money now? He might be alive. 他可能还活着。,3. must “必须；应该；一定；准是”，表示说话人认为有必要做某事，命令、要求别人做某事以及对事物的推测。mus
6、t 用来指一般现在时和一般将来时， 过去式可用 have to 的过去式代替。 I must finish my work today. You mustnt work all the time. Must I return the book tomorrow?,After such a long walk, you must be tired. 走了这么长的路, 你一定累了 He must be the man I am looking for. 他一定是我要找的人。 He had to go because of somebodys calling him that day. 那天他要走，
7、因为有人叫他。,值得注意的是：（1）must + have + 过去分词，表示现在对过去事物的推测。 He must have told my parents about it. He must have received my letter now. Its six oclock already, we must have been late again.,（2）must 和 have to 的区别: must 表示说话人的主观思想, have to “不得不,必须”,表示客观需要,客观条件只能如此。 You must do it now. 你必需现在就干。(说话人认为必须现在干) I ha
8、ve to go now. 我得走了。 (客观条件必须现在走) You must be here on time next time. I have to cook for my child.,4. need 情态动词，“需要”，多用在否定式或疑问句中. Need I attend the meeting tomorrow? You need not hand in the paper this week. 这一周你不必交论文。 need作情态动词的用法完全和其他情态动词一样，但 need 还可当作实义动词使用，这时 need 就象其他动词一样，有第三人称，单复数， 后面加带 to 的动词等特
9、性。,I need a bike to go to school. Do you need a dictionary? She needs a necklace. 注意：“neednt + have + 过去分词” 表示过去做了没必要做的事情。 You neednt have taken it seriously. 这件事情你不必太认真。,5. dare作情态动词, “敢”，多用在否定或疑问句中。Dare you catch the little cat? The little girl dare not speak in public. dare 除用作情态动词外，更多的是当实义动词使用，
10、用法同实义动词一样，要考虑人称，单复数，时态等。 Do you dare to walk in the dark? He doesnt dare to tell the teacher what happened that day.,6. ought “应当；应该”，后面跟带有 to 的动词不定式。 You ought to read these books if you want to know how to repair the motorcar. 如果你想知道如何修理汽车,你应该读这些书。 You ought to bring the child here. 你应该把孩子带来。,ough
11、t + to have done 句型,指过去动作,表示一件事情该做而未做。 You ought to have been here yesterday. ought not to have done 句型,表示一件不该做的事情却做了。 You ought not to have taken the book out of the reading-room.,7. will (would) 表决心、愿望。 would 为 will 的过去式, 可用于各人称。 Ill do my best to catch up with them. Ill never do it again, thats t
12、he last time. 我再不会做那件事情了,这是最后一次。 He said he would help me. 他说他会帮助我。 will, would用于第二人称疑问句表示说话人向对方提出请求或询问,用 would 比 will 更婉转,客气。,8. shall, should 表示命令, 警告, 允诺, 征求, 劝告, 建议, 惊奇。 You should hand in the exercise book. This should be no problem. 这应该没问题。 Shall we go now? Why should I meet him？ 为什么我要见他?,Its
13、hot. Will you open the windows? Will you help me to work it out? Would you like some coffee？,情态动词专练题,1.Put on more clothes. You be feeling cold with only a shirt on. A. can B. could C. must D. would 2. Must I drive to his house and pick up the children? No, _. A. you shouldnt B. you might not C. you
14、 neednt D. you mustnt,3.You to attend the meeting, but you didnt. A. should come B. would have come C. came D. should have come 4.We didnt see Tom at the meeting yesterday. He it. A. mustnt have attended B. cannot have attended C. neednt have attended D. would have not attended 5.Tom went on foot, b
15、ut he by bus. A. might go B. may go C. could have gone D. ought have gone,6.We play chess than bridge. Some of us dont know how to play bridge. A. had better B. would better C. would rather D. had rather 7.There is someone knocking at the door. it be Tom? A. Can B. Must C. Should D. Ought,8.There wa
16、s a lot of time. He . A. mustnt have hurried B. neednt have hurried C. could have hurried D. ought to have hurried 9.“We didnt study Chemistry last night, but we .“ A. had studied B. could C. should D. could have,10.One ought for what one hasnt done. A. not to be punished B. to not be punished C. to
17、 not punished D. not be punished 11.“May I pick a flower in the garden?“ “ .“ A. No, you neednt B. Not, please C. No, you mustnt D. No, you wont,12.“Could I call you by your first name?“ “Yes, you .“ A. will B. could C. may D. might 13.Two years ago, my husband bought me a bicycle. If you live in to
18、wn, it is often faster than a car and you worry about parking. A. must not B. may not C. should not D. dont have to,14.I didnt see her in the meeting-room this morning. She at the meeting. A. mustnt have spoken B. shouldnt have spoken C. neednt have spoken D. couldnt have spoken 15.I wonder how he t
19、hat to the teacher. A. dare to say B. dare saying C. not dare say D. dared say,16.You take your umbrella. I am sure it wont rain. A. shouldnt B. cant C. dont have to D. mustnt 17.The dog hibernate in winter. A. dont need B. doesnt need to C. needs not to D. needs not 18.Look what you have done. You
20、have been careful. A. should B. can C. must D. may,19.Tom did not go to the party yesterday, or I him. A. would see B. could meet C. might have seen D. might see 20. Lets go to the cinema, shall we? ? A. No, I cant B. Yes, I will C. Yes, thank you D. No, wed better not,21.If you had been more carefu
21、l, you have made so many mistakes. A. wont B. wouldnt C. may not D. mustnt 22.Whenever Mother was not here, the children make a lot of noise. A. will B. would C. were to D. were going to,23.Why is it so dark. There be a heavy rain coming. A. shall B. may C. should D. will 24.Tom is late. What to him
22、? A. should have happened B. must have happened C. can have happened D. would have happened,25.Tom, you play with the knife, you hurt yourself. A. wont, could B. mustnt, may C. shouldnt, must D. cant, should 26. “Can you imagine how about it?” “No, I cant.” A. could they know possibly B. could they
23、possibly know C. they could possibly know D. possibly they could know,27.Tom full marks, but he was too careless a spelling mistake. A. could gain, to make B. could have gained, to make C. could have gained, and made D. could have gained, as to make 28.I wonder how she the drunken sailor the other d
24、ay. A. dare fighting off B. dared fight off C. dare to fight off D. dared fighting off,29. the man there be our new teacher? He be, but Im not sure. A. May, mustnt B. Can, may C. Must, cant D. Can, cant,30. Someone is knocking at the door. Who it be? It be Tom. He is still in the school. A. can, cant B. can, mustnt C. might, could D. might, may,Good-bye!,