大学英语四级语法课件.pptx

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1、大学英语四级大学英语四级-语法篇语法篇时态复习时态复习 时时 态态 l时间状语从句当中的时态：l一般过去时 所有的过去l用 一般现在时 表示 现在和将来l现在完成时 现在完成和将来完成非谓语动词非谓语动词非谓语动词非谓语动词-不定式不定式 l1) 形式形式l主动形式主动形式 被动形式被动形式一般式一般式 to do to be done完成式完成式 to have done to have been done进行式进行式 to be doing 完成进行式完成进行式 to have been doing la) 完成式完成式: 不定式的一般形式所表示的动作不定式的一般形式所表示的动作, 通常与

2、通常与主要谓语表示的动作主要谓语表示的动作(状态状态)同时同时(或几乎同时或几乎同时)发生发生, 或或是在它之后发生是在它之后发生. 假如不定式所表示的动作假如不定式所表示的动作, 在谓语所在谓语所表示的动作表示的动作(状态状态)之前发生之前发生, 就要用不定式的完成式就要用不定式的完成式.I am glad to have seen your mother (= I am glad I have seen your mother).(比较比较: I am glad to see you.)He is said to have written a new book about workers.

3、He pretended not to have seen me.l b) 进行式进行式: 如果主要谓语表示的动作如果主要谓语表示的动作(状状态态)发生时发生时, 不定式表示的动作正在进行不定式表示的动作正在进行, 这时要用不定式的进行式这时要用不定式的进行式.You are not supposed to be working. You havent quite recovered yet.We didnt expect you to be waiting for us here.He pretended to be listening attentively. lc) 完成进行式: 在谓语

4、所表示的时间之前一直进行的动作, 就要用不定式的完成进行式.The struggle was known to have been going for twenty years.We are happy to have been working with you.ld) 被动式: 当不定式的逻辑上的主语是不定式所表示的动作的承受者时, 不定式一般要用被动形式.It is an honour for me to be asked to speak here.He wanted the letter to be typed at once.This is bound to be found out

5、.There are a lot of things to be done.She was too young to be assigned such work.l2) 功用: 不定式可以作主语 (a), 宾语 (b), 表语 (c), 定语 (d) 或是状语 (e).a. To scold her would not be just.b. We are planning to build a reservoir here.c. One of our main tasks now is to mechanize agriculture.d. Do you have anything to de

6、clare?e. We have come to learn from you.l3) 不带不带to 的不定式的不定式: la) 在在“动词动词+ 宾语宾语+不定式不定式”结构中结构中, 如果动如果动词是表示感觉意义的词是表示感觉意义的see, hear, watch, smell, feel, notice等等, 或是表示或是表示“致使致使”意义的意义的 have, make, let等等, 其后的不定式结构不带其后的不定式结构不带to.John made her tell him everything.l这类结构转换为被动语态时这类结构转换为被动语态时, 后面的不带后面的不带to 的的不定

7、式一般还原为带不定式一般还原为带to 的不定式的不定式.She was made to tell him everything.lb) 在 had better, had best, would rather, would sooner, would just as soon, might (just) as well, cannot but 等搭配之后, 动词不定式也不带to.Id rather not have eggs and bacon for breakfast.They cannot but accept his term.lc) 在make do, make believe, l

8、et drop, let fall, let fly, let slip, let drive, let go of, let there be, hear say, hear tell, leave go of等固定搭配中, 用不带to的动词不定式.John let fly a torrent of abuse at me.（一顿咒骂） Ive heard tell of him. （听说、听到）ld) 在动词help(或help +宾语)之后可用不带to的不定式, 也可用带to的不定式.Can I help (to) lift this heavy box? le) 在介词except,

9、but 之后, 如果其前有动词do的某种形式, 不定式一般不带to, 反之带to.There is nothing to do except wait till it stops raining.Smith will do anything but work on a farm.Theres no choice but to wait till it stops raining.lf) 连词 rather than, sooner than 置于句首时, 其后的不定式不带to.Rather than push the book back as he wanted to do, he force

10、d himself to pick it up.l出现在句中其他位置时, 其后的不定式有时带to, 有时不带to.He decided to write rather than telephone.The manager believes it is important to invest in new machinery rather than to increase wages.lg) 用作补语的动词不定式, 如果主语是由“all + 关系分句”，“thing +关系分句”，“what分句”或“thing +不定式结构”等构成，并带有do的某种形式，这时，作为主语补语的不定式可以省to，也

11、可以不省.What he will do is (to) spoil the whole thing.All you do now is complete the formThe only thing I can do now is go on by myself.The thing to do now is clear up this mess.The least I can do is drive everybody else closer to the issue.l4) 不定式的其他用法la) tooto 结构通常表示否定意义:She was too young to understa

12、nd all that.lenoughto结构则表示肯定意义:She was not old enough to understand all that.lnot too, but too, all too, only too等和不定式连用时,不定式一般不表示否定意义:Hes only too pleased to help her.lsoas (to)这种结构也可用不定式作状语:Be so kind as to drop in some time when you are free.lb) 如果要说明不定是表示的动作是谁做的, 可以在不定式前加一个for引起的短语:It is not har

13、d for one to do a bit of good.It is a great honour for us to be present at this rally.l在以某些形容词(如 kind, good, nice, wise, unwise, clever, silly, wrong, right, foolish, stupid, careless, considerate, rude, naughty, impolite等)作表语时, 不定式前可加一个of引起的短语, 来说明不定式指的是谁的情况:Its kind of you to think so much of us.(

14、It is) Awfully good of you to come and meet us.Its very nice of you to be so considerate.Its unwise of them to turn down the proposal. 动名词动名词l具有动作性特征的名词具有动作性特征的名词l1)是名词 seeing is believingl2)具有动词性特征可以带宾语一)动名词的形式:l一般形式：I dont like you smoking. l完成形式：I regret not having taken your advice.l被动形式：This qu

15、estion is far from being settled.二) 动名词常考的点l1)动名词做主语谓语动词为单数动名词做主语谓语动词为单数l2)在动名词和不定式中在动名词和不定式中,做为介词的宾语是动名词做为介词的宾语是动名词l3)动名词的否定直接在其前加否定词动名词的否定直接在其前加否定词,通过代词的宾格通过代词的宾格或所有格形式给出逻辑主语或所有格形式给出逻辑主语.lI would appreciate_ back this afternoon l Ayou to call Byou call Cyou calling Dyoure calling（Key：C your callin

16、g 也对）lI regret not having taken your advice.4)有些词后只能接动名词ladmit; appreciate; avoid; celebrate; consider; contemplate; defer; delay; deny; detest; discontinue; dislike; dispute; enjoy; it entails; escape; excuse; explain; fancy; feel like; finish; forgive; cant help; hinder; imagine; it involves; keep

17、; it means; mention; mind; miss; it necessitates; pardon; postpone; practice; prevent; recall; report; resent; resist; risk; suggest; understand.另外还有一些接另外还有一些接-ing形式的常用说法形式的常用说法lits no good; its no/little/hardly any/ use; its not/hardly/scarcely use; its worthwhile; spend money/time; theres no; ther

18、es no point in; theres nothing worse than; whats the use/point.5 有些词后加不定式和动名词均可lremember, forget, try, stop, go on, cease, mean后面用不定式和后面用不定式和-ing形式，意义截然不容。形式，意义截然不容。lI remembered to post the letters. (指未来/过去未来的动作)lI remembered posting/having posting the letters (我记得这个动作)lforgot与remember的用法类似。lI regr

19、et to inform you that 我很遗憾地通知你lI regretted having left the firm after twenty years. 为了二十年前的离开而遗憾。ltry to 努力 You really must try to overcome your shyness.ltry ing 试验 Try practicing five hours a day. lI mean to go, but my father would not allow me to. 打算、想我想去，但我父亲不让我去。lTo raise wage means increasing p

20、urchasing power. 意味着赠加工资意味着增加购买力。prefer的用法：的用法：l我宁愿在这里等。lI prefer to wait here. （所以啊，你不介意的话，我就等下去。）lI prefer waiting here.（我正在这里等，我就喜欢这么做。）lI prefer swimming to cycling. （这个句子里面就不能用不定式了。）分分 词词l3. 分词l1) 意义: 过去分词通常来自及物动词, 带有被动意义和完成意义; 而现在分词有的来自及物动词, 有的来自不及物动词, 通常带有主动意义和未完成意义.frozen food a freezing win

21、da bored traveller a boring journeya lost cause a losing battlea conquered army a conquering armya finished article the last finishing touchthe spoken word a speaking birda closed shop the closing houra recorded talk a recording machinel来自不及物动词的过去分词很少能单独用作前置修饰语, 能作这样用的仅限于下面几个词, 仅表示完成意义, 不表示被动意义.the

22、risen sun, fallen leaves, faded/withered flowers, returned students, retired workers, departed friends, escaped prisoners, the vanished jewels, newly-arrived visitors l用作后置修饰语的过去分词一般都带有修饰语或其他成分, 在意义上相当于关系分句.Most of the people invited to the reception were old friends.l2) 句法作用la) 作定语: distinguished g

23、uest 贵宾, unknown heroes 无名英雄, armed forces武装部队, canned food罐头食品, boiled water开水, steamed bread馒头, stricken area灾区l分词还可构成合成词作定语: simply-furnished room陈设简单的房间, clear-cut answer明确的答复, highly-developed industry高度发展的工业, heartfelt thanks衷心的感谢, hand-made goods手工制品, man-made satellite人造卫星lb) 作补足语: 可以带过去分词作宾

24、语补足语的动词有:see, hear, feel, find, think等表示感觉和心理状态的动词.I saw the students assembled in the hall.We found her greatly changed.lmake, get, have, keep等表示”致使”意义的动词:I have my hair cut every ten days.She got her bad tooth pulled out.Please keep us informed of the latest developments.llike, want, wish, order等表

25、示希望, 要求, 命令等意义的动词:I dont want any of you (to be) involved in the scandal.He wont like such questions (to be) discussed at the meeting.lc) 过去分词短语常用作状语, 修饰谓语, 很多都说明动作发生的背景或情况.Guided by these principles, they went on with the work,Delighted with her work, they made her the general manager.l过去分词短语也可作状语表

26、示原因, 相当于一个表示原因的状语从句.Influenced by his example, they performed countless good deeds.l有时也可说明动作发生的时间, 相当于一个表示时间的状语从句.This method, tried in areas near Shanghai, resulted in a marked rise in total production.l间或也可表示一个假设的情况, 相当于一个条件从句.Given closer analysis, we can see this is totally wrong.l偶尔也可用来代替一个“让步”

27、状语从句.Picked 20 years a year, it grows tired only after 40 or 50 years.虚拟语气虚拟语气条件句2022-4-28三种基本形式三种基本形式lIf I had a bike, I would lend it to you.(if从句用过去时, 主句用should/ would/ could/ might+不定式)lIf he had been here, he would have helped you.(从句过去完成时, 主句should /would/ could/ might +不定式完成时)lIf I should/wer

28、e to do the experiment, I would do it some other way. (从句用should/ were to, 主句用should/would /could /might+不定式)if的省略的省略l1. Were you in my position,you would do the same.l2. Had he come earlier,he would have seen her.l3. Should they attack us, we would wipe them out completely.If onlylIf only you would

29、 listen to reason.lIf only I were ten years younger.lIF only he didnt drive so fast.lIf only he had asked someones advice.lIf I could only go to the concert.lIf I could only/but/just explain.I wishlI wish I knew the answer.lI wish I had known the address.lI wish I were young.lI wish you would stop a

30、sking silly questions.lI wished I knew his address.(发生在过去=I was sorry I didnt know his address.)lI wished I were young.(=I was sorry I was not young.)Would ratherlI would rather you told her the truth.lId rather you came tomorrow.lId rather (that) he painted it blue.lI would (just)as soon that John

31、had not spoken rudely to me.It is (high) time that.lIt is time we_(leave).lIt is time we _(go)to bed.lIts high time that you were in bed.lIts about time we left.Its important that.lIt is important that we _ (speak) politely.lIt is imperative that we_ (practice) criticism and self-criticisml strange,

32、 advisable, anxious, crucial, appropriate compulsory, desirable, eager, essential, fitting, imperative(绝对必要的), impossible, improper, natural, necessary, obligatory, preferable, proper, urgent, vital, willingI insist thatlI insist that we _ (go) there by bus.lHe suggested that we _ (leave) early.lThe

33、 judge ordered that the prisoner _ (be) sentenced to 30 days in jail.这些动词和名词后的从句为这些动词和名词后的从句为should+Vladvise(advice), agree(agreement), decide(decision), decree, demand, determine (determination), grant, indicate(indication), insist, move (insistence), order, request, require prefer(preference), urg

34、e, vote, ask, propose(proposal), (requirement), resolve(resolution), stipulate, desirel(stipulation), allow, arrange, beg, concede, demonstrate, ensure, pray, intend, move, pledge, command My suggestion.lMy suggestion is that we should tell him.lOur only request is that this should be settled as soo

35、n as possible.lrequest command necessity importance motion proposal resolution recommendation understandingbut for, otherwise, withoutlThe storm delayed us. But for the storm we would have been in time.lI used my calculator; otherwise Id have taken much longer.lSupposing I accepted this offer, what

36、would you say?lWithout you timely help, my daughter would have drowned.情态动词情态动词l情态动词（model verb）用来表示能力、允许、可能、必须、劝告、意愿等概念或态度。主要的情态动词有can （could），may （might），shall （should），will （would），must，ought to，need，dare等。情态动词没有人称和数的变化，其后常跟不带to的不定式。 1. 情态动词的一般用法：情态动词的一般用法： l(1) 表示能力: can, could, be able tolHe is

37、 over 80 but still can read without glasses.lShe couldnt come yesterday.lHe cant come tomorrow. l can/could 与be able to 用法比较l1）be able to 除有一般现在时、一般过去时、一般将来时外，还可有现在完成时、不定式、动词-ing 形式等。l This is the information Ive been able to get so far.l To be able to ride a bike, she practiced a lot.l Just being a

38、ble to drive a horse, a cart isnt much help to us. l2) could表示过去总的、经常性的能力；was/were able to 表示过去具体情况下具有的能力，并且做了某动作。lHe could speak French, so he was able to show the French lady the way. l3) 表示将来的能力常用will be able to.lWhen will you be able to take us to town?(2)表示许可：表示许可：can/could,may/might;cant,mayno

39、t,mustnt,mustnotl1) 征询“许可”或给予“许可”可用can/could 或may/might 表示。May 用于正式场合，can 用于非正式场合，could 用于客气的询问，might 极少用。l You can go at four oclock.l Could I borrow your pen?l Students may take 3 books each. l Might I ask whether you are using the typewriter?l 2) 表示“不允许”用 cant, may not, mustnt； must not 语气重。l You

40、 cant leave the table unless you finish your meal.l Put that cigarette out. You must not smoke near a petrol pump!l 3) 表示过去“许可”不用could，might，要用其他表达方式。l We had been/were given permission to speak to the patient.l 但在间接引语中表达过去“许可”，可用could，might。l The nurse said that we could/might speak to the patient

41、for just a few minutes. (3)表示可能性：表示可能性：may/might,can/could,must;cantl1）may, might 用来推测现在“可能”；may比might表示的可能性大些。lWhy isnt John in class? He may/might be sick. l maybe是副词，不是情态动词。Maybe he is sick. l2) 在日常口语中常用can/could 表示“可能”。l You can/could walk for miles in the country without meeting anyone.l Can th

42、e news be true? No, it cant be true.l3) must表示可能性最大，“必定”；否定形式用cant表示“肯定不”、“必定不会”。lYou must be hungry after a long walk.lThe phone is ringing, but there is no answer. She cant be at home.（4）表示必须和需要：）表示必须和需要：must,haveto,needl1）must表示说话人认为“必须”；否定回答时用neednt “不必”。lYou must be here at nine oclock.lMust yo

43、u go soon? No, I neednt go yet.l2) have to 表示他人或客观情况要求“必须”。l I have to be back at school by eight. I have a lot of work to do tonight.l We dont have to wear uniforms in school.ll 口语中常用have got to 表示“必须”。lI have got to leave now. I have a meeting in ten minutes.l3) need 表示动作者“需要”、“有必要”，用于否定句或疑问句；肯定回答

44、用must，否定回答用neednt。l Need he go now? Yes, he must. No he neednt.ll need 常用作实义动词。l You need to learn the value of time.l You didnt need to tell him the news.l Does she need to go?l （5）表示责任和劝告）表示责任和劝告:should,oughtto,must,hadbetter l1) 用should和ought to 表示责任和劝告，后者的语气重些lYou should/ought to do as you are t

45、old.lSuch things shouldnt/ought not to be allowed.l2) 有时也用must 表示责任和劝告。lYou must see the movie. Its wonderful.l3) 口语中也常用had better 表示劝告，意为“最好做/不做某事”。lYou had better take care of yourself.lYoud better not make a mistake next time.lHadnt you better see who is at the door?（6）表示建议：）表示建议：shall，may/mighta

46、swell,may/mightjustaswell l1) “shall I/we” 表示征求对方对建议的看法。lShall we carry the boxes into the house?lLets go, shall we?l2) may/might as well, may/might just as well 表示推荐更佳方案，建议另一种做法，意为“倒不如”，“不也一样吗？”。lWe may as well stay here tonight.lYou might just as well tell the truth.(7)表示许诺：表示许诺：shalll shall用于第二、三

47、人称，表示说话人的许诺。l You shall have your money back next week.l If he passes the exam, he shall have a holiday. (8)表示意愿：表示意愿：shall,will/wouldl1) you/he/they shall 表示说话人的强烈意愿，甚至威胁。lYou shall pay for this.lThey shall do what I tell them to do.ll 在法律条文、规章制度中，shall 表示“必须”。lEach competitor shall wear a number.l

48、2) will/would 表示动作者愿意。lI will lend you the book if you need it.lI wont do it again.lI have been trying to open the door, but the key wont turn.ll “will you/would you” 在下列句中表示客气的建议、询问。lWill you please have a drink?lWould you please pass me the salt?lWould you like a cup of tea?lWould you mind if I op

49、ened the window?lWould you mind opening the window? Would you mind my opening the window?ll would 还表示过去的习惯。等于used tolOn Sundays he would get up early and go fishing.l (9)表示勇敢：表示勇敢：dare ldare 表示“敢于”，用于否定句、疑问句或条件句。lHe dare not try.lHow dare you open the letter?lIf you dare say a word, Ill strike you d

50、own.ll dare 还常用作实义动词。lHe dare to surf in heavy waters. ll daresay 或 dare say，表示probably, I suppose.lI dare say he will come home late.2. 情态动词的特殊用法情态动词的特殊用法l（1） 情态动词+不定式完成时l1） can/could, may/might, must + have + 动词的过去分词l用于肯定句：表示对过去事件的主观判断，推测过去某动作“可能”、“也许”、“一定”已发生。lTom could have taken the dictionary.