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1、 一.情態(tài)動(dòng)詞的定義: 情態(tài)動(dòng)詞表示說(shuō)話人對(duì)某一動(dòng)作或狀態(tài)的態(tài)度,即表示說(shuō)話人的某種感情或語(yǔ)氣.表示”需要”可以”必須”應(yīng)當(dāng)”等意義. 二.情態(tài)動(dòng)詞的特征:n 1.不能單獨(dú)作謂語(yǔ),除ought to, have to和used to以外，后面只能接不帶to的不定式；n 2.沒(méi)有人稱和數(shù)的變化。有些情態(tài)動(dòng)詞沒(méi)有過(guò)去式，如must;有些有過(guò)去式，如;n can-could may-might shall-should n will-would have to-had ton 3.情態(tài)動(dòng)詞的否定式一般是在它們的后面加否定詞not構(gòu)成; 情 態(tài) 動(dòng) 詞 表 示 推 測(cè)不 表 示 推 測(cè)can coul

2、dmay mightshall shouldmust will wouldought tohave to dare (darent)need (neednt) used to 三.情態(tài)動(dòng)詞的用法歸納:n (一).can/could:n 1.表示能力，常譯為“能,會(huì)”:n eg.(1).I can speak Japanese, but I cant write itn (2).Some of us can use the computer now, but we couldnt 10 years ago. n 2.表示許可,常譯為”可以”;could可以表示更加委婉的請(qǐng)求：n eg.(1).C

3、an/Could I have a look at your photos?n (2).You can smoke in this room. can/be able to辨析：n 1.從時(shí)態(tài)上:can只有現(xiàn)在時(shí)和過(guò)去時(shí)，而be able to則有更多形式.在將來(lái)時(shí),完成時(shí)和非謂語(yǔ)動(dòng)詞結(jié)構(gòu)中只能用be able ton 2.從意義上:can一般指理論上具備做一件事的能力，而be able to則表示設(shè)法做成某事，相當(dāng)于manage to do或succeed in doing n eg.(1).The young man couldnt carry the big stone(指不具備能力)n

4、 (2).This time I failed in the exam, but Ill be able to pass the exam next time.(指設(shè)法做到)n =Ill succeed in passing the exam next time. 1 A computer _ think for itself; it must be told what to do. A. cant B. couldnt C. may not D. might not2. The fire spread through the hotel very quickly but everyone _

5、 get out. A. had to B. would C. could D. was able toA D 3. They will _ run this machine on their own in three months.A. can B. could C. may D. be able to4. That big cinema _ seat 2,000 people.A. can B. should C. ought to D. is able to D A n (二).may/might:n 1.表示許可或在疑問(wèn)句中征詢對(duì)方許可，常譯為“可以”.表示征詢?cè)S可時(shí),may可與can

6、/could換用；might比may的語(yǔ)氣更委婉一些.對(duì)其一般疑問(wèn)句的肯定回答可用may或can,但否定回答時(shí)要用mustnt或cant. mustnt表示“不可以”n“禁止”之意. n eg.(1).You may go home now.n (2).May/Might I have a word with you?n (3).-May I come in?n -Yes, you may/cann -No, you cant/mustntn -_I take the book out? n -Im afraid notn A. Will B. May C. Must D. Need 1. C

7、ould I borrow your dictionary? Yes, of course you _.A. might B. will C. can D. should2. Might I watch TV after supper? Yes, you _. A. may B. must C. might D. couldC A n 2.may常用于祈使句中，表示祝愿:n eg.(1).May you succeed 祝您成功!n (2).May God bless you愿上帝保佑你！n (三).must/have to:n 1.表示“必須”時(shí),must表示說(shuō)話人的主觀看法，而have t

8、o表示客觀需要,因而常譯為“不得不；只好”講n eg.(1).I dont like to stay here any longer; I must leave now n (2).Its too late. I have to leave now n 2.常用have to的相應(yīng)形式表示現(xiàn)在,過(guò)去和將來(lái)“必須”做某事.have got to是have to的口語(yǔ)形式.have to前可以用情態(tài)動(dòng)詞，而have got to則不能,即不能說(shuō)will/shall/may have got ton eg.(1).I had to make money to support my familyn (

9、2).I will have to learn how to use a computer n 3.have to的疑問(wèn)式為:Do/Does/Did+主語(yǔ)+have to? have to的否定式是”do/does/did not (dont/doesnt/didnt) +have to”,表示沒(méi)有義務(wù)或必要做某事,意為”不必”,?？梢曰卮餸ust提問(wèn)的疑問(wèn)句,而must的否定式mustnt表示禁止,意為”不得,一定不要”n eg.(1).Do you have to go now?n (2).Take your time. You dont have to do it at once. n

10、4.must的否定式為must not/mustnt時(shí)意為“不許,禁止”,而need not/neednt意為“不必”n eg. Must I come back before ten?n -Yes, you must (No, you neednt/dont have to)n 5.must意為“偏要,偏偏”時(shí),指做令人不快的事情n eg.(1).Must you shout so loudly?n 你非要那么大聲嗎？ n (2).Why must it rain on Sunday?n為什么偏偏在星期天下雨？ n 1.I have told you the truth. _I keep r

11、epeating it?n A. Must B. Can C. May D. Willn 2.You_park here! Its an emergency exitn A. wouldnt B. neednt C. couldnt D. mustntn 3.You_buy a gift, but you can if you want ton A. must B. mustnt C. have to D. dont have to n (四).shall/shouldn 1.shall用于第一,三人稱的疑問(wèn)句中,表示說(shuō)話人征求對(duì)方的意見(jiàn)或向?qū)Ψ秸?qǐng)示n eg. When shall we be

12、gin our supper?n 2.shall用于第二,三人稱,表示說(shuō)話人給對(duì)方的命令,警告,允諾或威脅n eg.(1).You shall go with me.(命令)n (2).You shall fail if you dont work harder.(警告) n (3).He shall read the book when I finish reading.(允諾) n 3.should除基本用法“有責(zé)任或義務(wù)做某事”外,還表示勸告,建議,命令,其同義短語(yǔ)是ought to.在疑問(wèn)句中,通常用should代替ought to,意為”應(yīng)該”n eg.(1).You should

13、go to class right awayn (2).Should I open the window?n 4.should+have+done表示應(yīng)該做而實(shí)際上沒(méi)有做n eg. You should have handed it in earlier n n shouldnt+have+done表示不應(yīng)該做而實(shí)際上卻做了n eg. You shouldnt cheat in the exam. n -I havent got the reference book yet, but Ill have a test on the subject next monthn -Dont worry.

14、 You_have it by Fridayn A.could B.shall C.must D.may n (五).will/wouldn 1.表示請(qǐng)求,建議,用于第二人稱疑問(wèn)句中,would比will委婉客氣n eg. Would you pass me the book?n 2.表示意志,愿望和決心,有“愿,要”之意.would表示過(guò)去的意愿和決心n eg. I will never do that again n (六).would/used ton 兩者均表示“過(guò)去常?！?但would僅表示過(guò)去的習(xí)慣性動(dòng)作,現(xiàn)在有可能還如此,也有可能不再那樣;used to既表示過(guò)去的動(dòng)作也表示過(guò)去

15、的狀態(tài),不過(guò)現(xiàn)在不再做或不再有那種狀態(tài),強(qiáng)調(diào)與現(xiàn)在的對(duì)比n eg.1.He would get up at 8(現(xiàn)在可能還這樣)n 2.He used to get up at 8(現(xiàn)在不這樣了)n Xiao Li used to be a worker, but he is now a university student n (七).ought to/ought not ton 1.ought to”應(yīng)當(dāng);應(yīng)該”,只有一種形式,沒(méi)有人稱和時(shí)態(tài)的變化.它可以表示”有義務(wù)或責(zé)任”做某事,語(yǔ)氣比較強(qiáng),還可以表示”建議或勸告”.n eg.Humans ought to stop polluting

16、 naturen 2.同should一樣，ought to后跟動(dòng)詞不定式的完成式,其肯定句表示”過(guò)去本應(yīng)該做某事而未做”;其否定句則表示”過(guò)去不該做某事卻做了”. n eg.(1).You ought to have come here earliern (2).You oughtnt to have opened the letter!It wasnt for you n 3.ought to的否定形式為ought not to或oughtnt to,其一般疑問(wèn)句形式是將ought置于主語(yǔ)前n eg.(1).You oughtnt/ought not to blame himn (2).-O

17、ught I to go?n -Yes,you ought ton 4.在反意疑問(wèn)句中,下面兩種形式都可以:n eg.Bob ought to be at home now,shouldnt/oughtnt he? n 5.ought to/shouldn一般說(shuō)來(lái),兩者可換用,只是ought to語(yǔ)氣略強(qiáng).另外,表示出于法令規(guī)則,行為準(zhǔn)則,道德責(zé)任等客觀情況而”應(yīng)該”做某事時(shí),一般應(yīng)用ought to;若用should則含有個(gè)人意見(jiàn),強(qiáng)調(diào)主觀看法.n eg.(1).You are his father.You ought to take care of himn (2).We should n

18、ot use too many big words in our everyday speech n (八).need/needntn 1.need”需要,必要”,既可作情態(tài)動(dòng)詞,也可作實(shí)義動(dòng)詞n (1).用作情態(tài)動(dòng)詞,后接動(dòng)詞原形,沒(méi)有人稱和數(shù)的變化n eg.a.Need I do it at once?n b.Theres plenty of time.We neednt drive so fastn (2).用作實(shí)義動(dòng)詞時(shí),有動(dòng)詞的各種形式變化 n need+n./doing/to do n eg.a.He needs our helpn b.We dont need to tell h

19、im the truthn c.The bike needs repairing=The bike needs to be repairedn need doing=need to be done(主語(yǔ)與do之間為動(dòng)賓關(guān)系)n need to do(主語(yǔ)與to do之間為主謂關(guān)系) n 2.neednt have done表示“本來(lái)不必做某事卻做了”n eg.You neednt have told me the newsn 3.以need開(kāi)頭的疑問(wèn)句的否定回答可用neednt,但肯定回答常用Yes,I mustn eg.-Need you go now?n -Yes,I must/No,I

20、neednt n (九).used to/be used to do/be used to doingn 1.used to表示”過(guò)去常常,過(guò)去是”,沒(méi)有人稱和數(shù)的變化.其否定形式為usednt to或didnt use to.其一般疑問(wèn)句形式是將used提到主語(yǔ)前或用Diduse to結(jié)構(gòu)n eg.Did she use to be a doctor?n 2.be used to do sth.表示“被用來(lái)做某事”n eg.The wood here will be used to make a house n 3.be used to doing sth.表示習(xí)慣于做某事n eg.I am

21、 already used to the noisy city life heren (十).had better的用法n had better主要用來(lái)表示勸告或建議,其后跟動(dòng)詞原形,意為“最好”n had better(not)do n eg.Youd better try it again if you fail this time n (十一).would rather的用法n would rather 意為“寧愿”,表示選擇,后接不帶to的不定式n eg.Which would you rather do, go to cinema or stay at home?n (十二).dar

22、e的用法n dare既可以作情態(tài)動(dòng)詞,也可以作實(shí)義動(dòng)詞,意為“害怕” n 1.用作情態(tài)動(dòng)詞,后接動(dòng)詞原形,沒(méi)有人稱和數(shù)的變化n 2.用作實(shí)義動(dòng)詞,用”dare to do”結(jié)構(gòu)n三.情態(tài)動(dòng)詞表推測(cè)的特殊用法n 1.can/could表示對(duì)現(xiàn)在或過(guò)去情況的推測(cè),只用于疑問(wèn)句或否定句中n eg.(1).Can what he said be true?n (2).He cant be theren用于肯定句中,表示理論上的可能性 n eg.Accidents can happen at any time n 2.may/might表示對(duì)現(xiàn)在或過(guò)去情況的推測(cè),多用于肯定句和否定句中.may not表

23、示“可能不”之意;might比may可能性小n eg.He may be very busy nown 3.must表推測(cè)時(shí),只能用于肯定句中,意為“一定,肯定”n must+do 對(duì)現(xiàn)在或經(jīng)常發(fā)生的事作肯定的推測(cè)n must+have done 對(duì)過(guò)去事實(shí)或情況的肯定推測(cè) n must+be doing 對(duì)正在發(fā)生的事作肯定推測(cè) n此時(shí)，must的否定形式不是mustnt,而是cant/couldntn cant/may/must+don cant/may/must+have donen cant/may/must+be doingn對(duì)比:could have done”過(guò)去能做某事而沒(méi)做”

24、n 4.should表示推測(cè).這種推測(cè)往往有一定的根據(jù),含有“按道理應(yīng)該”之意n eg.If the train is on time,she should arrive in Beijing by seven 在不表示推測(cè)的情態(tài)動(dòng)詞中, 我們要注意以下考點(diǎn):1. 表示能力、許可的情態(tài)動(dòng)詞的用法。2. 表示否定的情態(tài)動(dòng)詞的用法。3. shall 和 will 的多種意義的區(qū)別。4. 情態(tài)動(dòng)詞短語(yǔ)的使用。5. 虛擬語(yǔ)氣中情態(tài)動(dòng)詞的使用。 I darent ask her for a rise. 我不敢請(qǐng)求她加薪.How did you dare to tell her that? I wonde

25、r whether he dare stand up in public. I dont know how she dares to wear that dress. Do you need any help?I wonder whether he need send it immediately.I need hardly tell you that the work is dangerous.The garden doesnt need watering at the moment.You neednt finish that work today. 可兼做行為動(dòng)詞的情態(tài)動(dòng)詞：need 、

26、 dare 情態(tài)動(dòng)詞 (+動(dòng)詞原形)行為動(dòng)詞 .needdare 1.無(wú) 人 稱 和 數(shù) 的 變 化 ; 2.尤 其 用 于 ：*否 定 句 及 疑 問(wèn) 句 中 ;*在 if/whether之 后 ;*或 與 hardly, never, no one, nobody連 用 ; 3.常 以 needn t 和daren t 的 形 式 出 現(xiàn) ;4.dare有 其 過(guò) 去 時(shí) dared. 多用于肯定句; (sb.) need to do dare to do(sth.) need to be done (sth.) need doing 判斷正誤: How dare you say such

27、 a thing? How dare you to say such a thing?He darent to speak English before such a crowd, did he?He darent speak English before such a crowd, dare he? 表 示 推 測(cè) 情 態(tài) 動(dòng) 詞 的 重 要 用 法 .1. You must be Mr Smith-I was told to expect you here.2. He must have known what we wanted.3. We may have read the same r

28、eport.4. He cant have slept through all that noise.5. Theres someone outside-who can it be? 2. 表示否定的情態(tài)動(dòng)詞的用法: 部分情態(tài)動(dòng)詞的否定式是情態(tài)動(dòng)詞中的考點(diǎn)之一。 mustnt 不準(zhǔn), 禁止 neednt 沒(méi)必要 ( = dont have to )cant 不能; 不可能may not 不可以; 可能不shouldnt 不應(yīng)該 ( = ought not to ) 1. You _ return the book now. You can keep it till next week if y

29、ou like. A. cant B. mustnt C. neednt D. may not2. Johnny, you _ play with the knife, you _ hurt yourself. A. wont ; cant B. mustnt ; may C. shouldnt ; must D. cant ; shouldntC B 3. -Will you stay for lunch? -Sorry, _. My brother is coming to see me. A. I mustnt B. I cant C. I neednt D. I wont4. -May

30、 I pick a flower in the garden? - _. A. No, you neednt B. Not, please. C. No, you mustnt D. No, you wontB C 4. 情態(tài)動(dòng)詞短語(yǔ)的使用:would like to dowould rather dowould rather + 從句would prefer to do.had better do. 改錯(cuò):1. Would you like having some tea?2. Id prefer going to the lecture this evening.3. Id rather you to go to the meeting.4. He would rather to die than to give in.5. Youd better to have your hair cut today.Would you like to have some tea?Id prefer to go to . you went to .He would rather die than give in.Youd better have .