情態(tài)單詞精講

1、-作者xxxx-日期xxxx情態(tài)單詞精講【精品文檔】一情態(tài)動詞I.情態(tài)動詞基本用法：情態(tài)動詞用法否定式疑問式與簡答can能力（體力，智力，技能）允許或許可（口語中常用）可能性（表猜測，用于否定句或疑問句中）can not / cannot /cant doCando?Yes,can.No,cant.couldcouldnt domay可以（問句中表示請求）可能，或許（表推測）祝愿（用于倒裝句中）may not do Maydo? Yes,may.No,mustnt/cant.mightmight not doMightdo? Yes,mightNo,might not.must必須，應該（表主

2、觀要求）肯定，想必（肯定句中表推測）must not/mustnt doMustdo? Yes,must.No,neednt/dont have to.have to只好，不得不（客觀的必須，有時態(tài)人稱變化）dont have to doDohave to do?Yes,do.No,dont.ought to應當（表示義務責任，口語中多用shouldought not to/oughtnt to doOughtto do?Yes,ought. No,oughtnt.shall將要，會用于一三人稱征求對方意見用于二三人稱表示許諾、命令、警告、威脅等shall not/shant doShalld

3、o?Yes,shall.No,shant.should應當，應該（表義務責任）本該（含有責備意味）should not/shouldnt doShoulddo?will意愿，決心請求，建議，用在問句中would比較委婉will not/wont doWilldo?Yes,will.No,wont.wouldwould not/wouldnt dodare敢（常用于否定句和疑問句中）dare not/darent doDaredo?Yes,dare. No,darent.need需要必須（常用于否定句和疑問句中）need not/neednt doNeeddo?Yes,must. No,need

4、nt.used to過去常常（現(xiàn)在已不再）used not/usednt/usent to dodidnt use to doUsedto do?Yes,used.No,use(d)nt.Diduse to do?Yes,did.No,didnt.二.1 情態(tài)動詞的語法特征1） 情態(tài)動詞不能表示正在發(fā)生或已經(jīng)發(fā)生的事情，只表示期待或估計某事的發(fā)生。2） 情態(tài)動詞 除ought 和have 外，后面只能接不帶to 的不定式。3） 情態(tài)動詞沒有人稱，數(shù)的變化，即情態(tài)動詞第三人稱單數(shù)不加-s。4） 情態(tài)動詞沒有非謂語形式，即沒有不定式，分詞，等形式。2 比較can 和be able to1）canc

5、ould 表示能力；可能 (過去時用could), 只用于現(xiàn)在式和過去式(could)。be able to可以用于各種時態(tài)。They will be able to tell you the news soon. 他很快就能告訴你消息了。2）只用be able to a. 位于助動詞后。 b. 情態(tài)動詞后。 c. 表示過去某時刻動作時。 d. 用于句首表示條件。 e. 表示成功地做了某事時，只能用was/were able to， 不能用could。He was able to flee Europe before the war broke out.= He managed to flee

6、 Europe before the war broke out.注意：could不表示時態(tài)1）提出委婉的請求，（注意在回答中不可用could）。 - Could I have the television on? - Yes, you can. / No, you cant.2）在否定，疑問句中表示推測或懷疑。 He couldnt be a bad man. 他不大可能是壞人。3 比較may和might1） 表示允許或請求；表示沒有把握的推測；may 放在句首，表示祝愿。May God bless you!He might be at home.注意： might 表示推測時，不表示時態(tài)。

7、只是可能性比may 小。2） 成語： may/might as well，后面接不帶to 的不定式，意為不妨。 If that is the case, we may as well try.典型例題Peter _come with us tonight, but he isnt very sure yet. A. mustB. may C. can D. will答案B. 表可能性只能用may.此句意可從后半句推出。4 比較have to和must1)兩詞都是必須的意思，have to 表示客觀的需要， must 表示說話人主觀上的看法，既主觀上的必要。My brother was very

8、 ill, so I had to call the doctor in the middle of the night.我弟弟病得很厲害，我只得半夜里把醫(yī)生請來。(客觀上需要做這件事)He said that they must work hard. 他說他們必須努力工作。（主觀上要做這件事） 2)have to有人稱、數(shù)、時態(tài)的變化，而must只有一種形式。但must 可用于間接引語中表示過去的必要或義務。He had to look after his sister yesterday.3） 在否定結構中： dont have to 表示不必mustnt表示禁止， You dont ha

9、ve to tell him about it. 你不一定要把此事告訴他。 You mustnt tell him about it.你一定不要把這件事告訴他。5 must表示推測1) must用在肯定句中表示較有把握的推測，意為一定。2) must表對現(xiàn)在的狀態(tài)或現(xiàn)在正發(fā)生的事情的推測時， must 后面通常接系動詞be 的原形或行為動詞的進行式。 You have worked hard all day.You must be tired. 你辛苦干一整天，一定累了。（對現(xiàn)在情況的推測判斷）He must be working in his office. 他一定在辦公室工作呢。比較： H

10、e must be staying there. 他現(xiàn)在肯定呆在那里。 He must stay there. 他必須呆在那。 3) must 表示對已發(fā)生的事情的推測時，must 要接完成式。 I didnt hear the phone. I must have been asleep.我剛才沒有聽到電話，我想必是睡著了。4) must表示對過去某時正發(fā)生的事情的推測，must 后面要接不定式的完成進行式。-Why didnt you answer my phone call?-Well, I must have been sleeping, so I didnt hear it.5) 否

11、定推測用cant。 If Tom didnt leave here until five oclock, he cant be home yet.如果湯姆五點才離開這兒，他此時一定還未到家。6 表示推測的用法can, could, may, might, must 皆可表示推測，其用法如下：1）情態(tài)動詞+動詞原形。表示對現(xiàn)在或將來的情況的推測，此時動詞通常為系動詞。I dont know where she is, she may be in Wuhan.2）情態(tài)動詞+動詞現(xiàn)在進行時。表示對現(xiàn)在或將來正在進行的情況進行推測。At this moment, our teacher must be

12、 correcting our exam papers.這時，我們老師想必在批改試卷。3）情態(tài)動詞+動詞完成時。表示對過去情況的推測。We would have finished this work by the end of next December.明年十二月底前我們很可能已完成這項工作了。The road is wet. It must have rained last night.地是濕的，昨天晚上一定下雨了。4）情態(tài)動詞+動詞的現(xiàn)在完成進行時。表示對過去正在發(fā)生事情的推測。Your mother must have been looking for you.你媽媽一定一直在找你。5

13、）推測的否定形式，疑問形式用cant, couldnt表示。Mike cant have found his car, for he came to work by bus this morning.邁克一定還沒有找回他的車，因為早上他是坐公共汽車來上班的。注意：could, might表示推測時不表示時態(tài)，其推測的程度不如can, may。7 情態(tài)動詞+ have +過去分詞1) may(might) have + done sth, can (could) have + done sth表示過去，推測過去時間里可能發(fā)生的事情。Philip may (might) have been hur

14、t seriously in the car accident.Philip can (could) have been hurt seriously in the car accident.2)must have +done sth，對過去時間里可能發(fā)生的事情的推測，語氣較強，具有肯定，諒必的意思。-Linda has gone to work, but her bicycle is still here.-She must have gone by bus.3) ought to have done sth, should have done sth本應該做某事，而事實上并沒有做。否定句表

15、示不該做某事而做了。You ought to (should) have been more careful in this experiment.He ought not to have thrown the old clothes away.（事實上已扔了。）ought to 在語氣上比should 要強。4) neednt have done sth 本沒必要做某事I dressed very warmly for the trip, but Ineednt have done so. The weather was hot.5) would like to have done sth

16、本打算做某事I would like to have read the article, but I was very busy then.8 should 和ought toshould 和ought to 都為應該的意思，可用于各種人稱。-Ought he to go?-Yes. I think he ought to.表示要求，命令時，語氣由 should（應該）、had better最好）、must（必須）漸強。9 had better表示最好had better 相當于一個助動詞，它只有一種形式，它后面要跟動詞原形。had better do sth had better not d

17、o sthIt is pretty cold. Youd better put on my coat.Shed better not play with the dog. had better have done sth表示與事實相反的結果，意為本來最好。You had better have come earlier.10 would rather表示寧愿would rather dowould rather not dowould rather than 寧愿而不愿。還有would sooner, had rather, had sooner都表示寧愿、寧可的意思。If I have a

18、choice, I had sooner not continue my studies at this school.I would rather stay here than go home. = I would stay here rather than go home.典型例題-Shall we go skating or stay at home?-Which _ do? A. do you ratherB. would you rather C. will you rather D. should you rather答案B。本題考查情態(tài)動詞rather的用法，would rath

19、er +do sth 意為寧愿，本題為疑問句，would 提前，所以選B。11 will和would注意： 1）would like； Would like to do = want to 想要，為固定搭配。 Would you like to go with me?2）Will you?Would you like? 表示肯定含義的請求勸說時，疑問句中一般用some, 而不是any。 Would you like some cake?3）否定結構中用will，一般不用would, wont you是一種委婉語氣。 Wont you sit down12 情態(tài)動詞的回答方式問句肯定回答否定回答

20、Need you?Yes, I must.No,I needntMust you?/dont have to. 典型例題1）-Could I borrow your dictionary?-Yes, of course, you_. A. mightB. will C. can D. should 答案C.could表示委婉的語氣，并不為時態(tài)。答語中of course，表示肯定的語氣，允許某人做某事時，用can和 may來表達，不能用could或might。復習： will 與you連用，用來提出要求或下命令。should與you 連用，用來提出勸告。2）-Shall I tell John

21、about it?-No, you _. Ive told him already. A. needntB. wouldntC. mustntD. shouldnt 答案A。neednt 不必，不用。 wouldnt 將不, 不會的。 mustnt 禁止、不能。 shouldnt不應該。本題為不需要，不必的意思，應用neednt。3）-Dont forget to come to my birthday party tomorrow.-_.A. I dont B.I wont C. I cantD. I havent 答案B.will既可當作情態(tài)動詞，表請求、建議、也可作為實義動詞表意愿、意志

22、、決心，本題表示決心，選B。13 帶to 的情態(tài)動詞帶to 的情態(tài)動詞有四個：ought to, have to, used to, be to, 如加上have got to ,(=must), be able to，為六個。它們的疑問，否定形式應予以注意： Do they have to pay their bill before the end of the month? She didnt use to play tennis before she was fourteen. You ought not to have told her all about it. Ought he t

23、o see a heart specialist at once.? ought to 本身作為情態(tài)動詞使用。其他的詞作為實義動詞使用，變疑問，否定時，須有do 等助動詞協(xié)助。典型例題Tom ought not to _ me your secret, but he meant no harm. A.have toldB.tellC.be tellingD. having told答案A。由于后句為過去時，告訴秘密的動作又發(fā)生在其前因，此地應用過去完成時，但它在情態(tài)動詞 ought to 后，所以用have。14 比較need和dare這兩詞既可做實義動詞用，又可做情態(tài)動詞用。作為情態(tài)動詞，兩

24、者都只能用于疑問句，否定句和條件句。 need 作實義動詞時后面的不定式必須帶to，而dare作實義動詞用時, 后面的to 時?？梢员皇÷浴?) 實義動詞： need（需要, 要求） need + n. / to do sth2) 情態(tài)動詞： need，只用原形need后加do，否定形式為need not。Need you go yet? Yes, I must. / No, I neednt.3) need 的被動含義：need, want, require, worth（形容詞）后面接doing也可以表示被動：need doing = need to be done中考助動詞和情態(tài)動詞復習

25、題一、用適當?shù)那閼B(tài)動詞填空。1. Would you like to go swimming with me this afternoon? Id love to, but Im afraid I _. I have too much work to do. 2. You _ swim in this part of the lake. Its dangerous. 3. _ I use your dictionary? Of course you can. 4. _ I know your name? Sure. My name is Han Huimei. 5. I dont unders

26、tand this sentence. _ you explain it to me?6. _ I tell him the truth right now? No, you _. You can tell him about it later. 7. That sweater _ be yours. No, it _ be mine. Mine is over there.8. Jim left his English book at home. He _ borrow one from other students. 9. _ you have a merry Christmas and

27、happy New Year!10. May I pick a flower in the garden? No, you _. 二、改正下列句子中的一處錯誤。1. Must I know your name, please?2. Theyll go swimming next Saturday and so do we. 3. It must be our monitor. No, it mustnt be him. He has gone home. 4. Youd better to help him with his English. 5. With your help, we wil

28、l able to finish the work on time. 6. Will you like to join us in the singing contest?7. He had not better talk in class. The teacher will get angry. 8. Could I use your cell phone? Yes, you could. 9. Will I help you carry the suitcase?10. Must I report this to our head teacher now? No, you mustnt.

29、30. Never touch my computer while Im away. _. A. I shouldntB. I mustntC. I wontD. I dont31. That tall boy _ be John. John is medium height. A. mustnt B. mustC. cant D. might32. This kind of food _ cool, clean and dry according to the instruction. A. should be carriedB. must be put C. should be place

30、d D. must be kept33. Must I finish that work today? No, you _. You may finish it in three days. A. mustnt B. neednt C. shouldntD. couldnt 34. Where is mom now? Im not sure. She _ be in the kitchen. A. shallB. mayC. needD. must35. Joan, you are late! Sorry, I _ next time. A. dontB. wontC. am not D. h

31、avent36. We _ talk loudly when we see the sign on the right. A. mustB. mustntC. need D. neednt37. Must I go and do it now? No, you _. We still have two more days. A. shouldnt B. cantC. needntD. wont38. May I do the rest of the work tomorrow? Yes, of course. You _ finish it today. A. must B. mustntC. needntD. need39. Must I finish the work today, Mom? No, you _. You can finish it tomorrow. A. mustnt B. cant C. shouldnt D. neednt40. Do I