2019-2020年高考英語 沖刺講義七 情態(tài)動(dòng)詞和虛擬語氣.doc

2019-2020年高考英語 沖刺講義七 情態(tài)動(dòng)詞和虛擬語氣I.情態(tài)動(dòng)詞基本用法情態(tài)動(dòng)詞用 法否定式疑問式簡答式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,cantcouldcouldnt 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(yīng)該（表主觀要求）肯定，想必（肯定句中表推測）must not/mustnt doMustdo? to.Yes,must.No,neednt/dont havehave to只好，不得不（客觀的必須，有時(shí)態(tài)和人稱的變化）dont have to doDohave to do?Yes,do. No,dont.ought to應(yīng)當(dāng)（表示義務(wù)責(zé)任，口語中多用should）ought not to/oughtnt to doOughtto do?Yes,ought. No,oughtnt.shall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 doShalldo?Yes,shall. No,shant.should應(yīng)當(dāng)，應(yīng)該（表義務(wù)責(zé)任）本該（含有責(zé)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 doWill/Woulddo?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,neednt.used to過去常常（現(xiàn)在已不再）used not/usednt/usent to dodidnt use to doUsedto do?Diduse to do?Yes,used. No,use(d)nt. Yes,did. No,didnt.II.情態(tài)動(dòng)詞的重點(diǎn)知識(shí)表示“能力、許可”的can和may表示能力的情態(tài)動(dòng)詞用can/couldA puter_think for itself; it must be told what to do.A.cant B.mustnt C.may not D.might not表示許可時(shí)用may/might ,can/could 都可以，但在問句中用could?或might？ 以使口氣委婉客氣，其回答一定要用can或may，以使回答口氣明確（must表示一定，必須，mustnt表示禁止，不許可）。Could I call you by your first name? Yes, you_A.will B.could C.may D.mightJohnny, you_play with the knife, you_hurt yourself.A.wont/cant B.mustnt/may C.shouldnt/must D.cant/shouldnt在肯定句中could不可以用來表示過去某一特定場合的能力，而要用was/were able to。The fire spread through the hotel very quickly buteveryone_get out.A.had to B.would C.could D.was able to表示“推斷、判斷”的canmay,must在肯定句中都可以用來表示可能。在含義上must語氣最肯定,may表示的是事實(shí)上的可能性。Peter_e with us tonight, but he isnt very sure yet.A.must B.may C.can D.will而can表示的是邏輯上的可能性：Mary is in poor health. She can be ill at any times.在否定句中只能用can和may。所以cant時(shí)用以代替mustnt，語氣比may更肯定。中文可以翻譯為不可能。Michael_be a policeman, for hes much too short.A.neednt B.cant C.should D.may在疑問句只能用can，不能用may和must。He may be very busy now. Can he be very busy now?He must be very busy now. Can he be very busy now?needneed作為情態(tài)動(dòng)詞只有一種形式，只用于否定句和疑問句。daredare作為情態(tài)動(dòng)詞用時(shí)有兩種形式：dare和dared兩個(gè)詞形，除了可以用于否定句和疑問句外，還可以用于條件從句或表示懷疑的句子中。If he dare e,I will kick him out. I dont know whether hedare say.注意:He doesnt dare(to)answer the question.（否定句）Does she dare(to)enter the dark room?（疑問句）shall用于第一人稱：征求對方的意見。What shall we do this evening?用于第二、三人稱：警告、命令、允諾、威脅等。You shall fail if you dont work harder. 警告He shall have the book when I finish reading.允諾He shall be punished.威脅should勸告、建議、命令、應(yīng)該做、道義上的責(zé)任。You should(ought to) go to class right away. I should(ought to) help him because he is in trouble.will/would請求、建議，would比will委婉客氣。Would you pass me the book?表示意志、愿望和決心。I will never do that again. They asked us if we would do that againwould可表示過去反復(fù)發(fā)生的動(dòng)作或某種傾向。During the vacation he would visit me every weekThe wound would not heal.（傷口老是不能愈合）would表示估計(jì)或猜想。It would be about ten when he left home. What would she be doing there?情態(tài)動(dòng)詞+have done的用法could+have done：本可以做而實(shí)際上未能做。You could have done better, but you didnt try your best.cannot+ have done：表示對現(xiàn)在或過去行為的否定推測。He cannot have been to that town.can+主語+ have done：表示對過去行為的懷疑或不肯定（用在疑問句中）。Can he have got the book?might(may)+ have done：對過去發(fā)生的行為不太肯定的推測。He may not have finished the work.If we had taken the other road, we might have arrived earlier.must+ have done：對過去發(fā)生的行為肯定的推測。其否定式為：cannot have done。You must have seen the film.You cannot have seen the film.neednt+ have done：本來不必要做的而實(shí)際上又做了。You neednt have watered the flowers,for it is going to rain.注意：didnt need to(have to)do：沒有必要做而實(shí)際上也沒有做I didnt need to clean the windows.My sister did it 2 hours ago.should(ought to)+ have done：本來應(yīng)該做而實(shí)際上又沒有做。其否定形式表示某中行為不該發(fā)生卻發(fā)生了。You should have started earlier, but you didnt.She shouldnt have taken away my measuring tape,for I worked to use it.注意：He should have finished the work by now.（表推測）虛擬語氣類 別用 法例 句If引導(dǎo)的條件從句與現(xiàn)在事實(shí)相反從句動(dòng)詞：過去式（be用were）主句動(dòng)詞：should/would/could/might+doIf he were here, he would help us.與過去事實(shí)相反從句動(dòng)詞：had+done主句動(dòng)詞：should/would/could/might+have+doneIf I had been free,I would have visited you.與將來事實(shí)相反從句動(dòng)詞：過去式/should+動(dòng)詞原形/were+to do主句動(dòng)詞：should/would/could/might+動(dòng)詞原形If it should rain tomorrow, we would not go camping.省略if的虛擬條件句將虛擬條件從句中的were，had,should放到主語之前，構(gòu)成主謂倒裝Should he e ,tell him to ring me up.Were I you,I would not do it.Had I been free,I would have visited you.混合虛擬條件句不同時(shí)間的虛擬：各遵守各的規(guī)則If he had listened to me, he would not be in trouble now.If he had told me yesterday,I should know what to do now.If I were you, I would have gone to her birthday party.虛擬與陳述的混合：各遵守各的規(guī)則He could have passed the exam,but he wasnt careful enough. You should have e earlier.The bus left a moment ago.含蓄虛擬條件句but for+名詞表示虛擬條件句子或主句中的謂語動(dòng)詞的形式視具體情況而定。這是考查考生應(yīng)變能力的最佳試題。-But for your timely warning,we _ into great trouble.-You know were friends.A. would get B. must have got C. would have got D. cant have gotwithout+名詞表示虛擬條件Without the air to hold some of the suns heat, the earth at night would be freezing cold.動(dòng)詞不定式表示虛擬條件It would be only partly right to follow in this way.如果用這種方式，僅僅對了一半。現(xiàn)在分詞表示虛擬條件Having known in time ,we might have prevented the accident.要是及時(shí)得知的話，我們也許能阻止這場事故。過去分詞表示虛擬條件Given more attention, the tree could have grown better.如果多留心的話，這樹本來可以長的更好。副詞otherwise表示虛擬條件I was too busy at that time.Otherwise,I would have called you.我當(dāng)時(shí)太忙，否則我就給你打電話了。連詞but連接的句子表示虛擬條件He _fatter but he eats too little .A. would bee B. would have bee C. must bee D. must have bee 其它狀語從句as if/as though引導(dǎo)的狀語從句中動(dòng)詞用did或haddone或wouldcouldmightdo。注意：as if/as though引導(dǎo)的狀語從句中也可以用陳述語氣：當(dāng)說話者認(rèn)為所述的是真實(shí)的或極有可能發(fā)生或存在的事實(shí)時(shí)：It sounds as if it is raining聽起來像是在下雨。He talks as if he is drunk從他談話的樣子來看他是醉了。與現(xiàn)在事實(shí)相反He talks as if he knew where she was與過去事實(shí)相反He talks about Rome as if he had been there before.與將來事實(shí)相反He opened his mouth as if he would say something.in order that/so that引導(dǎo)的狀語從句中動(dòng)詞用can/could/may/ might/ would等+doTurn on the light so that we can see it clearly.賓語從句demand, suggest, order, insist后接的從句中動(dòng)詞為should+doHe suggested that we not change our mind.wish后的從句中分別用過去式，過去完成式和should/would+do表示與現(xiàn)在，過去和將來情況相反I wish I could be a pop singer.I wish I would have gone to Shanghai last month.主語從句在It is necessary / important / strange thatIt is suggested / demanded/ ordered / requested that等從句中，謂語動(dòng)詞用should+doIt is strange that such a person should be our friends.其它句型中It is time that句型中動(dòng)詞用過去式或should+doIts high time that we left/should leave.would rather所接的從句中動(dòng)詞用過去式或者過去完成式I would rather you stayed at home now.If only句型中動(dòng)詞常用過去式或者過去完成式，表示強(qiáng)烈的愿望If only our dream had e true!