动词概述助动词和情态动词

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1、动词概述、助动词和情态动词7.0动词概述表示动作和状态的词叫做动词。英语中的时态、语态、语气和非谓语形式等都是由动词 来表达的，因此，动词在英语语法体系的处于中心和核心地位，是英语学习的重点和难点。7.1动词的种类根据功能分类根据其在句中的功能，动词可分为四类：实义动词(Notional Verb)、系动词(Link Verb)、助动词(Auxiliary Verb)、情态动词(Modal Verb)。见表 7.1。表7.1动词的分类类别特点用法举例实义动词及物动词(vt.)后跟宾语后接宾语表达整体意思She has a nice dress.不及物动词(vi.)其后不能 直接接宾语可独立作谓

2、语He comes late everyday.系动词后跟表语不能独立做谓语，跟表语 构成完整意思They are doctors.助动词后接动词原形或分词(无词 汇意义)不能独立做谓语，跟主要 动词构成谓语，表示疑问， 否疋及各种时态I don like his way of living.情态动词后接动词原形(有自己的词 汇意思)不能独立做谓语。表示说 话人语气、情态，无人称 和数的变化You must go to school on time.根据与主语的限定关系分类根据是否受主语的人称和数的限制，可分两类：限定动词(Finite Verb)和非限定动词(Non-finite Verb)

3、。1) She sings very well.她唱得很好。(sing受主语she的限制，故用第三人称单数形式sings。)2) She wants to learn En glish well.她想学好英语。(to learn不受主语she的限制，没有词形变化，是非限定动词。)英语中共有三种非限定动词，分别是：动词不定式(Infinitive)、动名词(Gerund)、分词(Participle)。根据动词的组成形式分类根据动词的组成形式，可分为三类：单字词 (One-Word Verb)、短语动词(Phrasal Verb)、 动词短语(Verbal Phrase)。1) The En g

4、lish Ian guage contains many phrasal verbs and verbal phrases.英语里有许多短语动词和动词短语。(contains是单字动词)2) Stude nts should lear n to look up new words in diet ion aries.学生们学会查字典。(look up是短语动词)3) The young ought to take care of the old.年轻人应照料老人。(take care of是动词短语)按动词的形式分类按动词的形式可以分为：谓语动词和非谓语动词。1谓语动词表7.2谓语动词形式用法

5、举例人称与主语在人称一致I am washing now. 第一人称数与主语在数上一致He sings well.第三人称单数时态表示动作发生的时间He wrote a letter to me last mon th. 过去时态语态主语是动作的发生者或 者承受者We study English.主动The room was filled with n ewspapers. 被动语气说话人表达事实、要求、 愿望等He has gone to America. 事实 I wish I could swim like a fish. 愿望2、非谓语动词表7.3非谓语动词形式意义用途举例不定式起形容

6、词和名词作用可作主语、表语、宾语、定语、状语It takes me 20 minutes to go home.动名词起名词作用作主语和宾语She likes singing.分 词现在分词起形容词、副词作用， 表主动作表语、定语、状语、 宾语补足语The window is broke n.过去分词起形容词、副词作用， 表被动The door was broke n by him.动词的五种形态原形(Original Form)、第三人称单数形式 (Singular From in Third Person)、过去式(Past Form)、过去分词(Past Participle)、现在分词

7、(Present Participle)。7.2助动词协助主要动词构成谓语动词词组的词叫助动词(Auxiliary Verb)。被协助的动词称作主要动词(Main Verb)。最常用的助动词有： be, have, do, shall, will, should, would 等。助动词自身 没有词义，不可单独使用。助动词be的用法1. be +现在分词，构成进行时态。如:1) They are watchi ng TV. 他们正在看电视。(现在进行时)2) En glish was beco ming more and more importa nt. 英语现在越来越重要。(过去进行时)2.

8、 be +过去分词，构成被动语态。如：3) The apple was eaten by Lucy.苹果被露西吃了。4) En glish is taught throughout the world. 世界各地都教英语。IPS|用法小贴士be +动词不定式，可表示下列意义：1. 表示最近、未来的计划或安排。例如：1) He is to go to Lon don next week. 他下周要去伦敦。2) We are to wash ourselves.我们要洗澡了。这种用法也可以说成是一种将来时态表达法。2. 表示命令。例如:3) You are to reach a conclusio

9、n.对此你要做出总结。4) He is to come to the classroom. 要他今天下午来教室。3表示相约、商定。例如:5) We are to meet at the school gate at eight next Friday.我们下周五 8 点在校门口集合。722助动词have的用法1. have +过去分词，构成完成时态。例如：1) He has fini shed homework.他已完成了作业。(现在完成时)2) By the end of last year, they had finished half of their work.去年末为止，他们已经完成

10、工作的一半。(过去完成时)2. have + been +现在分词，构成完成进行时。例如：3) She has bee n look ing for her mother for five years.五年来，她一直在寻找她的妈妈。(现在完成进行时)3. have + been +过去分词，构成完成式被动语态。例如：4) The prese nt has bee n sent to her.礼物已经寄给她了。助动词do的用法1. 构成一般疑问句。例如:1) Do you like En glish? 你喜欢英语吗？2) Did you go shopping? 你去购物了吗？2. do + n

11、ot构成否定句。例如：3) I do n ot want to join your party. 我不想参加你们的聚会。3. 构成否定祈使句。例如：4) Don stay there!不要呆在那里！4. 放在动词原形前，加强该动词的语气。例如：5) Do wait for me. 一定要等着我。5. 用于倒装句。例如：6) Never did I hear of such a thi ng.我从未听说过这样的事情。6. 用作代动词。例如：7) -Do you believe him? -Yes, I do.你相信他吗？一是的，我相信。IPST用法小贴士1. 构成否定祈使句只用do，不用did和

12、doeso2. 引导倒装句的副词常见的有never, seldom, rarely, little, only, so, well 等。7.2.3 助动词 shall 和 willshall和will作为助动词可以与动词原形一起构成一般将来时。例如:1) I shall work harder.我将更加勤奋工作。2) He will return. 他要回来了。TIPS用法小贴士在传统语法中，shall用于第一人称，will用于第二、第三人称。现在，尤其是在口语 中，will常用于第一人称，但 shall只用于第一人称，如用于第二、第三人称，就失去助动词的意义，已变为情态动词。7.2.4 助动

13、词 should 和 would1. should无词义，只是shall的过去形式，与动词原形构成过去将来时。例如：1) I wa nt to know what I should do next.我想知道下一步我该做什么。2. would也无词义，是will的过去形式，与动词原形构成过去将来时，用于第二、第三人称。2) She said she would leave for Shanghai.她说她要去上海。PRACTICE即学即练Multiple choice1. If it is fine tomorrow, wea football match.A. haveB. will have

14、C. hasD. shall has2. When he was at school, heearly and take a walk before breakfast.A. will rise B. shall riseC. should rise D. would rise3. In the past 30 years Chinagreat advances in the socialist revolution and socialistcon struct ion.A. has made B. have made C. had made D. havi ng made4. Igo to

15、 bed un til Ifini shed my work.A. don t/had B. didn t/haveC. didn t/had D. don t/have5. you thi nk heback by dinner time?A. Do/have come B. Did/will have come C. Does/will come D. Do/will have come6. He said that he dropped his bag whe n hefor the bus.A. was running B. was runningC. were runningD. i

16、s running7. No soonerhe arrived home tha n heto start on ano ther journ ey.A. has/was askedB. have/were askedC. had/is askedD. had/was asked8. “you give me a room for the night?” I asked on arriving at the hotel.A. ShouldB. CanC. MightD. May9. There are nine of them, soget into the car at the same t

17、ime.A. they may not at all B. all they may not C. they can t all D. all they can t10. “ We didn t see him atettiure yesterday. ”“ Heit. ”A. m ustn t attendB. cannot have attendedC. would have not attendedD. needn t have attended7.3情态动词概述1. 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。女口

18、：1) May I have your name? 我能知道你的名字吗？2) You must obey the school rules. 你必须遵守校规。2. 情态动词主要有： 1. can, could 2. be able to 3. may, might 4. must 5. have to 6. need7. used to 8. had better 9. should 10. ought to3. 情态动词的语法特征(1) 情态动词不能表示正在发生或已经发生的事情，只表示期待或估计某事的发生。(2) 情态动词 除 ought 和 have 外，后面只能接不带 to 的不定式。(

19、3) 情态动词没有人称，数的变化，即情态动词第三人称单数不加-s。(4) 情态动词没有非谓语形式，即没有不定式，分词，等形式。can 和 could 的用法 (could 可作为 can 的过去式 )1. 表示能力1) Da Shan can speak Chinese very well. 大山能流利地讲汉语。2) She could play the violin when she was young. 她年轻时就能弹钢琴。2. 表示可能性3) He cant be at home. 他不可能在家。4) Anybody can make mistake. 任何人都可能会犯错误。3. 表示许

20、可5) Father said I could go to cinema. 爸爸说我可以去看电影。6) You can play in the garden for a while. 你可以在花园里玩一会儿。4. 表示惊异、怀疑、不相信等态度(主要用语否定句、疑问句和感叹句中)。7) Where could/can they go now? 他们现在能去哪儿呢？8) He surely can t finish the task already! 他肯定不可能已经完成任务了！5. 比较委婉客气地提出较非正规的请求。这时 could 和 can 没有时间上的差别，只不过用 could 比 can

21、 用显得更加委婉客气。9) Can I go with you ? 我能跟你一起走吗？10) Could I ask you something ? 我可以问你一件事吗？6. 与不定式完成体连用，can+不定式完成体，表示对过去可能发生的事态的推测；Could+不定式完成体 ,表示对过去的推测， 但发生的可能性较小， 也可以表示过去能做而没有做 的事，有时用来提出婉转的批评和表示懊悔，意思是“本该” “本可以”。11) I could have left it in a shop. 我可能将它丢在了商店里。12) She can have bee n there.她不会去那儿的。13) She

22、 could get into university if she didn leave school.如果不辍学的话，她能进大学。的用法1. 可以跟一动词，意思和can差不多，有时两者可以换用。1) I m not able to (can ) answer your question.我回答不了你的问题。2) Were you able to (Could you) play the pia no? 你会弹钢琴吗？TIPS用法小贴士1. can只用于现在式和过去式 (could)，而be able to可以用于各种时态，有时不能用can来代替。1) They will be able to

23、 tell you the news soon.他很快就能告诉你消息了。2) The child hasn been able to speak.那孩子还不会讲话。2. 可以和某些情态动词或系动词连用。3) I ought to be able to get his phone number.我应当可以弄到他的号码。7.3.4 may和might的用法(might可作为 may的过去式)1. 表示许可(请求、给予或拒绝许可)。1) You may take the book home.你可以把书带回家去 .2) May I use your dictio nary? 我可以用你的词典吗 ？3)

24、 He told me he might be here on time.他说他能按时间来。2. 表示可能性。 might表示推测时，不表示时态，只是可能性比may小。例如：4) It may snow later this afternoon.(表示预测)今天下午可能会下雪。5) You might be right.(表示有可能)你可能是对的。3. 表示祝愿(不用 might)6) May you be happy every day!希望快乐每一天！7) May all your dreams come true!但愿你梦想成真！4. 与不定式完成体连用，may/might +不定式完成

25、体，表示对过去事态的推测或表示过去本来可以完成而未能完成的动作。8) Sam might have take n the mon ey, but it seems un likely.钱可能会是Sam拿走的，但又不太像。IPST用法小贴士用may表示“可能”一般不用于疑问句，在疑问句中通常用can代替。例如:1. Can it be true?这可能是真的吗？2. What can she be thinking of? 他会想些什么呢？7.3.5 must的用法1. 表示必须，否定式 must not (mustn )表示“禁止”。1) You must recycle your rubbi

26、sh.你必须对垃圾进行回收。2) I really must do somethi ng about it. 我真应该对此采取一些措施了。3) In many sec on dary schools childre n must wear uni forms.很多中学都要求学生必须穿校服。2. 表示推测(一般用于肯定陈述句中)。4) The light is still on, so he must be at home. 灯还亮着，他一定在家。5) After such a long walk, you must be tired. 走了这么长的路，你一定累了。3. 表示必然6) You m

27、ust catch a cold if you don put on more clothes. 如果你不多穿些衣服，必然会感冒。4. 与不定式完成体连用，must+不定式完成体，表示现在对过去事态的推断，具有较大的可能性，一般译为“一定，想必”。对过去表示否定的推测时，其否定形式通常不是 must not,而是 cannot。7) He must have left in the caf .他一定是将它丢在了咖啡馆里。8) He must have told my pare nts about it.他一定把这件事情告诉我父母亲了。TIPS用法小贴士在回答包含 must的问句时，若是肯定回答

28、可用 must;若为否定回答 要用needn或dont have to,表示“不必”的意思。例如：1) Must I take the foundation courses? 我必须学预科(基础)课程吗？Yes, you must.是的，你必须学。No, you needn .不， 没必要。7.3.6 have to 的用法1) He has to finish his homework before he watches TV .在看电视节目之前，他得先完成作业。2) They have to wear un iforms for the first five years. But in t

29、he last two years, they don have to wear uni forms.上学的头5年，他们必须穿校服，但到了最后2年，他们就不必穿校服了。2. 可用于多种时态3) I had to walk very fast to overtake you. 我得走很快才能赶上你。4) These last two days I have had to take a rest.最近这两天我不得不休息了一下。5) Wehave to help him as much as we can.我们将不得不尽力帮他。6) If it hadn been for your help, I

30、would have had to leave.要不是你帮忙，我就得离开这里了。7) First Id have to get my fathers con se nt.首先我必须取得我爸的同意。3. 用于被动语态8) All the books have to be catalogued.所有的书都得分类。9) The road and the bridge will have to be rebuilt.路得重修，桥得重造。IPST用法小贴士must和 have to的区别：1. must用来指一般现在时和一般将来时，have to可用于各种时态。1) You must be here o

31、n time next time.你下次一定要按时来。2) He had to leave early yesterday.昨天他不得不早些离开。2. must表示主观意志，have to强调客观需要。3) I must buy prese nts for my En glish frien ds. They have bee n so kind to me.我必须给我的英国朋友买些礼物，他们一直都对我那么好。4) I have to move out of my flat on Friday. My Ian dlord wants the keys back. 我得在星期五搬出，我房东要收回

32、钥匙。3. have to的否定形式表示“不必”，而must not/mustn 表示“不准”“禁止”。5) You must n smoke here because they sell petrol.你不能在这里抽烟，因为他们在卖汽油。6) You do nthave to pay for that. Its free.你不必付钱，这是免费的。7.3.7 need的用法作情态动词用1. 表示“需要”或“必须”1) Need I attend the meeting tomorrow? 我需要明天参加会议吗2) You need not hand in the paper this week

33、. 这一周你不必交论文。2. 和有否定意思的副词连用 , 如 never, hardly, scarcely 等 , 表示“不用说” ，“不用告诉”或 “不用提醒”等。3) I hardly/scarcely need say how much we missed you. 不必说我们多么想念你。3. 与不定式完成体连用，n eed+不定式完成体，表示过去做了没必要做的事情。4) They neednthave broken the machine. 他们没有必要拆开机器。5) You neednt have taken it seriously. 这件事情你不必太认真。作实义动词用1. 这时

34、 need 就像其他动词一样 , 有第三人称 , 单复数 , 后面加带 to 的动词等特性。1) Do you need a dictionary? 你需要词典吗 ?2) She needs a necklace. 她需要一条项链。2. n eed+动词的现在分词也可以表示被动，n eed doi ng = need to be done。3) The roof needs repairing. 屋顶需要修补了。4) My hair needs cutting. 我该理发了。3. 复合宾语5) I need my coat mended. 我的上衣需要补一补。6) He needed his

35、eyes tested. 他需要请人验光。7) I need you over to help me with children. 我需要你过来帮我照料孩子。7.3.8 used to 的用法1. 表示过去的习惯动作或状态，现在已不存在。在否定陈述句中，一般用didn t use,to也可用used not to;在疑问句中用“Diduse to。”1) My friends used to like him. 我的朋友们曾都喜欢他。2) What did she use to do during the holidays? 过去她在假日里干什么？3) My mother didn tuse

36、to work during the week. 我妈过去不上班。2. 表示反复发生在过去的动作或过去持续的状态,但不能用来表示一直持续到现在的动作 或状态。试比较：4) We used to go camp ing every summer.我们过去每年夏天都去露营。(暗含的意思是我们现在不这样做了)5) We have gone camp ing for years.我们露营多年了。(暗含的意思是我们现在还这样做)ARNING注意事项used to与be used to不同，后者表示 be accustomed to习惯于某种状态”，而且跟接名 词或动词ING形式，而used to后接动词

37、原形。7.3.9 had better 的用法1. had better表示 最好”，后接动词原形，其否定式为had better not +动词原形。1) It is pretty cold. Youdbetter put on my coat.天很冷，你最好穿上我的大衣。2) You had better not follow his behavior.你最好不要学他。3) Shedetter not play with the dog.她最好不要逗狗玩。2. 与不定式完成体连用，had better have done sth表示与事实相反的结果，意为本来最好”4) You had be

38、tter have come earlier.你本来最好是早点来。3. 与不定式进行式连用，表示最好立即做某事。5) I think you d better be going.我想你最好马上走。7.3.10 should 的用法1. 表示应该。1) You should see a doctor now.你现在就应该去看病。2) You should mind your own bus in ess.(你该只)管好你自己的事。(意为别管闲事)3) I should answer his letter as soon as possible.我应该尽快给他回信。2. 委婉陈述自己的意见。4)

39、I should th ink you are right. 我想你是对的。5) That should be Sam and his mother.那准是 Sam 和他的母亲。3. 表示惊异、赞叹、不满等情绪。6) Why should you thi nk so? 你怎么会这么想？7) It s wonderful that you should have achieved so much in these years.这几年你们有了这样大的成就，真了不起。4. 表示推测。8) The book you n eed should be in our library.我们图书馆应该会有你需要

40、的那本书。9) They should be home by now.现在他们应该到家了。5. 与不定式完成体连用，should+不定式完成体，表示应该做的事而没有做。10) She should have put it in my bag.她本应该将它放在包里的。7.3.11 ought to 的用法1. 表示应该(与should同义，只是口气稍重些)。否定式在ought后加not。1) Teachers ought to be hon ored.教师应该受到尊敬。2) You ought not to smoke so much.你不应该抽这么多烟。3) You ought to lock

41、 the door at night.夜间你应该锁门。2. 表示可能性4) Since she is not here, she ought to be in the classroom.她应该在教室，因为她不在这儿。5) It cloudy now; it ought to rain soon. 现在有云，一会儿应该下雨了。3. ought + to have done指过去动作，表示一件事情该做而未做。而ought not to have done表示一件不该做的事情却做了。6) You ought to have bee n here yesterday.你昨天就应该来。7) You o

42、ught n ot to have taken the book out of the readi ng-room. 你不应该把书带出阅览室。IPS| 用法小贴士should与ought to的区别：should可表示陈述意见，推出建议或请求；而 ought to可 以表示劝告之意。如：1) You ought to respect your pare nts. 你应该尊重你的父母亲。2) He suggested that they should leave at on ce. 他建议他们立刻离开。RACTICEP即学即练1. Jean have kept his promise. I wo

43、nder why he changed his idea.A. mustB. should C. n eedD. would2. Jane have come to the party, but she not find the exact time.A. could; could B. might; could C. should; could D. should; would3. So many mistakes in your homework! You more careful.D. should have bee nA. may beB. had toC. would bebe at

44、 home now, because he was see n play ing basketball in the stadiumjust now.A. mustn tB.needn tC. can tD. should nt5.-I can t understand why our boss is late.-He the early bus.A. could missB. may have missedC. can have missed D. might miss asleep.6. She did nt an swer the phone; sheA. may be7. The li

45、ttle girlA. may cryB. must be C. should have bee ns eyes were red. SheB. must cryC. must be criedD. must have bee nD. must have bee n crying4. Her brother8. Hehis supper now, for the dining hall is still closed.A. can t be havingB. needn tbe havingC. mustn t be havingD. should nt be having9. I parke

46、d my bike behi nd the buildi ng, but now it is gon e. It _A. may be stole nB. must be stole nC. must have bee n stole nD. must have stole n10.Mr. BlackA. Did; used toC. Did; use togo to work by ferry before the bridge was built?B. Use; toD. Does; use to综合练习1. Marybe in Paris , for I saw her in the t

47、own only a few minutes ago .A. must ntB. cantC. should ntD. may not2. -Shall I tell John about it?-No, you. Ive told him already.A. need ntB. would ntC. mus tntD. should nt3. Put on more clothes. Yoube feeli ng cold with only a shirt on.A. canB. couldC. wouldD. must4. Mr. Bush is on time for everyth

48、ing . Howit be that he was late for the openingceremony?A. canB. shouldC. mayD. must5. Where is my pen ? Iit .A. might lose B. would have lost C. should have lost D. must have lost6. My sister met him at Grand Theatre yesterday after noon , so heyour lecture.A. couldn t have attendedB. needn t have

49、attendedC. mustn t have ettdedD. shouldn t have attended7. Jackyet, otherwise he would have telephoned me .A. mustn t have arrivedB. should have arrivedC. can t have arrivedD. need not have arrived8. I should have been there, but Inot find the time.A. would B. couldC. mightD. should9.There was plent

50、y of time She_A. mustn t have hurriedB. couldnt have hurriedC. must not hurryD. needn t have hurried10.He hesitated for a moment before kicking the ball ，otherwise ， he a goalA. had scoredB. scoredC. would scoreD. would have scored11. - Could I call your first name ？- Yes, you .A. willB. couldC. may

51、D. might12. Johnny， you play with the knife ， you hurt yourself A. won t can B. tmustn t; may C. shouldn ；mtust D. can ；tshouldn t13. The fire spread through the hotel very quickly but everyone get out A. had to B. wouldC. couldD. was able to14. You to the meeting this afternoon if you have somethin

52、g important to do A. needn t to comeB. dont need comeC. dont need comingD. needn t come15. - We could have walked to the station ， it was so near-Yes A taxi at all necessary A. wasnt B. hadn t been C. wouldn t be D. wont be16. He is really incompetent! The letter yesterday.A. should be finished typi

53、ngB. must be finished typingC. must have finished typingD. should have been finished typing17. The boy told his father that he would rather an astronaut.A. become B. to become C. becoming D. became18. When we reached the station, the train had still not arrived; so we .A. needed not to hurryB. needn

54、 t have hurriedC. need not to have hurriedD. didn t need to hurry19.Since your roommate is visiting her family this weekend, you like to have dinner withus tonight?A. will B. won t C. wouldn tD. do20.He was afraid what he had done a disastrous effect on his career.A. might haveB. could beC. have been D. shall be动词概述、助动词和情态动词7.2 即学即练1. B 2. D3. A 4. C 5. D6. B 7. D8. B9. C10. B7. 3 即学即练1. B 2. A3. D 4. C5. B6. D7. D8. A9. C10. C综合练习1. B 2. A3. D 4. A5. D6. A7. C8. B9. D 10. D11.C 12. B13. D14. D15. A16. D17. A18. B 19. C 20. A