情態(tài)動詞語法講義教師版

學習必備歡迎下載學習必備歡迎下載學習必備歡迎下載高三英語情態(tài)動詞虛擬語氣語法講義I.情態(tài)動詞基本含義特殊含義can表一般的能力Marycanswim.表示許可或請求允許向?qū)Ψ秸埱笤S可Can/Could/May/MightI……肯定回答Yes,youcan/may否定回答No,youcan’t/maynot/mustn’t/you’dbetternot3.can用于肯定句表示理論上的可能性，譯為“有時，常常，往往會”Evenexpertscanmakemistakes.4.用于固定句型cannot/couldn’t（help/choose）butdo只好，不得不can’twaittodosthcan’thelpdoingsthcannot/couldn’t(can/couldnever)+形容詞副詞比較級表示肯定，最高級的概念cannot(never)……enough/toomuch無論怎樣也不為過，越…越好5.could用于虛擬語氣couldhavedone本能夠做實際上沒做到might1.表可能性Hemightbeathome.

他可能在家2.請求對方許可May/MightI……?3.may/mightwelldo完全有理由may/mightaswelldo最好，不如Ourholidayswereruinedbytheweather;wemightjustaswellhavestayedathome.08全國）Lizamaywellnotwanttogoonthetrip—shehatestravelling.4.表祝愿Mayyoubehappy!5.表示虛擬語氣mighthavedone本可以做實際沒做mightn’thavedone_______6.表推測must表必須，必要（mustn’t________）MustI…?肯定Yes,youmust.否定No,youneedn’t/youdon’thaveto.2.表偏偏，偏要，指發(fā)生與說話人的愿望相反或令人不愉快的事情或表示一定要Naturally,afterItoldherwhattodo,mydaughtermustgoanddotheopposite.3.表示肯定推測should表示勸告，建議，命令（oughtto）--TurnofftheTV,Jack,shouldn’tyoubedoingyourhomeworknow?--Mun,justtenmoreminutes.表示應該做且有一種道義上的責任--Yououghttohavegiventhemsomeadvice.--So____________________(確實如此)，butIwastoobusy?表示明顯的結(jié)果或合理的推斷，且與所期待的事幾乎是事實。--WhencanIcomeforthephotos?Ineedthemtomorrowafternoon.--They_____bereadyby12.pm.4.用于I’msurprisedthat…..,Youcan’timagine……,It’sstrang等句型后表示驚訝，惋惜，憂慮Youcan’timaginethatatopstudentshouldhavefailedinthecollegeentranceexamination.5.用于虛擬語should/oughttohavedone本不應該做但實際上做了shall用于第一，三人稱表示征求對方意見ShallI/we……Shallhe/they…用于第二，三人稱表示說話人對對方的命令，許諾或威脅,命令Ifyoutakegoodcareofmycamera,youshallkeepitwithyouduringyourholiday.用于各種人稱表示立法，規(guī)章，法令，預言等Beingexaminedtwiceayearistherulethateverydrivershallobeyinthiscity.Nostudent______gooutoftheschoolcampusafter10:00atnightwithoutpermission.will表將來時，可表示說話人臨時做出的決定--Didyoutellhimabouttheresult?--Oh,no,Iforgot.I_____hernow.Will/Wouldyou表請求3.用于各種人稱表意志，決心，意愿等Ifyouwilllisten,Iwilltellyouhowtodealwiththeproblem.4.表經(jīng)常性的習慣，傾向（過去的習慣）wouldHewillsittherehourafterhourlookingatthetrafficgoby.would1.用來提出請求Wouldyoupleaselookovermyessay?2.用來請出問題Let’sfixaday.WouldSundaynightsuityou?用來提出看法Papawouldn’tallowit.I’msureshewouldn’tmindyourgoing.4、用來提出意愿I’dgotherewithyou.II.五年高考題情態(tài)動詞（共6題）201134.---Ileftmyhandbagonthetrain,butluckilysomeonegaveittoarailwayofficial.---Howunbelievabletogetitback!Imean,someone______it.A.willhavestolenB.mighthavestolenC.shouldhavestolenD.musthavestolen201025.---Ihaven’tgotthereferencebookyet,butI’llhaveatestonthesubjectnextmonth.---Don’tworry.YoushallhaveitbyFriday.200922.--Annisinhospital.--Oh,really?Ididn'tknow.Iwillgoandvisither.28.Hedidnotregretsayingwhathedidbutfeltthathecouldhaveexpresseditdifferently.200835.---I’msorry.Ishouldn’thaveshoutedatyoutheotherday.---Forgetit.Iwasabitoutofcontrolmyself.200722.---Shelooksveryhappy.Shemusthavepassedtheexam.---Iguessso.It’snotdifficultafterall.200621.---IthinkI’llgiveBobaring.---Youshould.Youhaven’tbeenintouchwithhimforages.III.1.-----What’sthematterwiththemanhanginghisheadthere?------Well,ifyou_____know,hewascaughtstealingmybike.A.mustB.mayC.canD.shall2.Peter______bereallydifficultattimeseventhoughhe’sanicepersoningeneral.（遼寧卷）A.shall B.should C.can D.must3.Itishardtosaywhatkindofpersonheis.Sometimesheisveryfriendly;atothertimeshe___beverycold.A.canB.mustC.willD.shall4.Ifthefirstfewsentencesofyourapplicationletterfailtowinthereaders’attention,therestoftheletter_______notbereadatall.A.mustB.shallC.mightD.can5.---WhatdoyouthinkoftheAmericansingerLadyGaga’sperformance?---Toocrazy,butifshe______cometoChinatoholdconcerts,Iwouldbuyticketsforherliveshow.A.wouldB.couldC.shouldD.might6.---Areyougoingtofindajobbackinyourhometown?---Well,Ihaven’tdecidedyet.I______findsomeotherchoices.A.wouldB.mustC.shouldD.mightIV.情態(tài)動詞+havedone情態(tài)動詞+havedone用法例句Musthavedone對過去發(fā)生的行為進行推測“一定，想必做了某事”Itmusthaverainedlastnight,fortheroadisquitemuddy.canhavedone/can’thavedone對過去發(fā)生的行為的懷疑和不肯定，通常用在否定句疑問句中“可能做過某事”Canhehavegonetohisaunt’s?couldhavedone用于肯定句“可能已經(jīng)…”否定句表“不可能已經(jīng)…”表過去沒有實現(xiàn)的可能性“本來可以…”ItwasMrWangwhowentbyjustnow.Hecouldn’thavegonetoBeijing.IfIcouldhavetoldyouaboutculturaldifferencesbetweenItalyandtheUK,Iwouldhave.Youcouldhavedonebetter,butyouwerecareless.may/mighthavedone對過去發(fā)生的行為的推測“也許已經(jīng)…”一般只用于肯定句，否定句，不用于疑問句。might表語氣更加不肯定It’stoolate.Hemayhavegonetobed.mighthavedone(1)“也許已經(jīng)…”(2)“本來應該或可以做某事”含輕微的責備Youshouldnothaveswuminthatarea.Youmighthavebeeneatenbyashark.Youmighthavegivenhimmorehelp,thoughyouwerebusy.should（not）havedoneought(not)tohavedone“本來應該做某事”實際沒做Yououghttohavedonethisexercisemorecarefully.Need(not)havedone肯定時表本來需要做確未做，否定時表本不必做卻做了某事Youneedn’thavetakenataxihere,foritwasveryneartomyhouse.1.（2011·江西卷）We_____John’snameontheracelistyesterdaybutforhisrecentinjury【D】A.willputB.willhaveputC.wouldputD.wouldhaveput2.（2011·陜西卷）I__________throughthatbitterperiodwithoutyourgeneroushelp.【A】A.couldn’thavegoneB.didn’tgoC.wouldn’tgoD.hadn’tgone3.（2011·福建卷）——Pityyoumissedthelectureonnuclearpollution?！狪it,butIwasbusypreparingforajobinterview.【D】A.attendedB.hadattendedC.wouldattendD.wouldhaveattended4.Thankyouforallyourhardworklastweek.Idon’tthinkwe______itwithoutyou.（山東卷）A.canmanage B.couldhavemanaged C.couldmanageD.canhavemanaged5.Iwasreallyanxiousaboutyou.You______homewithoutaword.A.mustn’tleaveB.shouldn’thaveleftC.couldn’thaveleftD.needn’tleave6.Hehesitatedforamomentbeforekickingtheball,otherwisehe_____agoal.A.hadscoredB.scoredC.wouldscoreD.wouldhavescored7.ItishardformetoimaginewhatIwouldbedoingtodayifI_____inloveattheageofseven,withtheMelindaCoxLibraryinmyhometown.A.wouldn’thavefallenB.hadnotfallenC.shouldfallD.weretofall8.-----What’sthematterwithPeter?----Hewasseencryingwhenhewascomingoutoftheteacher’soffice.He____bytheteacher.A.maybescoldedB.shouldhavebeenscoldedC.mustbescoldedD.musthavebeenscolded9.Theymusthavebeenenjoyingthemselvesthere,otherwisethey_____solong.A.can’thavestayedB.wouldn’thavestayedC.needn’thavestayedD.couldn’tstay10.-----Mummy,Ihavebrokenmytrain.-----Itoldyouso.You____onit.A.mustn’thaveriddenB.couldn’trideC.shouldn’thaveriddenD.needn’tride11.Asitturnedouttobeasmallbirthdayparty,you_______soformally.A.needn’tdressupB.didn’tneedhavedressedupC.didnotneedtodressupD.needn’thavedressedupV.高考題及模擬題精選1.-----IsJohncomingbytrain?-----Heshould,buthe______not.Helikesdrivinghiscar.A.mustB.canC.needD.may2.Ithasbeenannouncedthatcandidates_____remainintheirseatsuntilallthepapershavebeencollected.A.canB.willC.mayD.shall3.-----Iheardtheywentskatinginthemountainslastwinter.-----It_____truebecausetherewaslittlesnowthere.A.maynotbeB.won’tbeC.couldn’tbeD.mustn’tbe4.Whentheoldmanwasalive,he______sitforhoursatthedoor.A.would

B.could

C.must

D.might5.I’vedecidedtotakethejobandI______changemymind.

A.mustn’t

B.can’t

C.won’t

D.maynot6.(NMET2008全國II)Liza___wellnotwanttogoonthetrip---shehatestraveling.A.willB.canC.mustD.may7.Youcan’timaginethatatopstudent____havefailedinthecollegeentranceexamination.A.mightB.needC.shouldD.would8.Thankyouforgivingmeahand.I_____intheexperimentwithoutyourvaluablehelp.A.havefailedB.willfailC.wouldhavefailedD.musthavefailed9.Hisfailureintheexperimentsuggestedthathe_____histeacher’sproperinstructions.A.shouldnothavefollowedB.shouldnotfollowC.mustn’thavefollowedD.hadn’tfollowedII.虛擬語氣(TheSubjunctiveMood)虛擬語氣多用在虛擬條件句中，表示假設的情況在客觀上是完全不存在的（即與現(xiàn)在或過去的事實剛好相反），或者是實現(xiàn)的可能性很?。磁c將來的事實很可能相反）。如果假設的情況是完全可能發(fā)生的，這種句子就不能看作是虛擬條件句，而應該作為真實條件句來處理，要用陳述語氣。下面舉兩個例子，對這兩種條件句作一比較。1.

Ifitrainstomorrow,Ishallstayathome.如果明天下雨，我就呆在家里。2.

Ifitshouldraintomorrow,Ishallstayathome.萬一明天下雨，我就呆在家里。例1是真實條件句，表示下雨的可能性很大（比如說，根據(jù)氣象預報，明天有雨）。例2是虛擬條件句，表示下雨的可能性很?。ū热缯f，根據(jù)氣象預報，明天天晴）。該語法主要用于if條件狀語從句，也可用于主語從句、表語從句、賓語從句等。通常有三種情況：①與過去事實相反。（過去虛擬）②與現(xiàn)在事實相反。（現(xiàn)在虛擬）③與將來事實可能相反。（將來虛擬）“后退一步法”①與過去事實相反，在從句中用haddone形式表示。②與現(xiàn)在事實相反，用did/were形式表示。③與將來事實可能相反，用did/were/should/weretodo形式表示。I.虛擬語氣在if條件句中的用法1.表示與現(xiàn)在事實相反，謂語動詞的主要形式如下：1)IfIwereyou,Ishouldn'tdothat.2)Wewouldgowithyouifwehadtime.3)Wecouldaskhimifhewerehere.4)IfIknewhistelephonenumber,Iwouldringhimup.條件從句主句Iftherewere(be)nomusic,theworldwould(be)verydull.IfIknew(know)herphonenumber,Iwouldring(ring)himnow.2.表示與過去事實相反，謂語動詞的主要形式如下：1)Ifhehadseenyouyesterday,hewouldhaveaskedyouaboutit.2)Ifyouhadcomeearlier,youwould(might)havemethim.3)IwouldhavecalledyouifIhadknownyourphonenumber.條件從句主句IfIhadknown(know)thatyouwerecoming,Iwouldhavepickedyouup(pickup)youattheairport.Ifwehadhad(have)enoughrainlastyear,wewouldhavegained(gain)agoodharvest.3.表示與將來事實可能相反，謂語動詞的主要形式如下：1)Ifitshouldrain,thecropswouldbesaved.2)Ifitweretosnowtomorrow,theywouldnotgoout.3)Ifitrainedtomorrow,wewouldnotgoout.條件從句主句Ifitshould/snowed/weretosnow(snow)tomorrow,ourplanwouldbepostponed(postpone)Ifthesunrose/shouldrise/weretorise(rise)inthewest,Iwouldchange(change)mymind.Note:①省略連詞if。在書面語中，如果虛擬條件句中有were,had或should，可以if把省略而把這幾個詞放到主語之前構(gòu)成主謂倒裝：例如：1.Ifheshouldcome(Shouldhecome),tellhimtoringmeup.2.IfIwereyou(WereIyou),Iwouldnotdoit.3.Ifhehadbeenmorecareful(Hadhebeenmorecareful),suchmistakescouldhavebeenavoided.4.IfIhadworkedhard(HadIworkedharder),Iwouldhavesurelysucceeded.5.Iftimeweretogoback(),Iwouldworkdoublehard.6.Ifitshouldbefinetomorrow(),wewouldgoforanouting.Note:②Ifyouhadanothergo,youwouldsucceed.(would表示必然結(jié)果)Ifyouhadanothergo,youcouldsucceed.（could表示能夠）Ifyouhadanothergo,youmightsucceed.（might表示可能的結(jié)果）用括號里的單詞的正確形式填空。1.Ifyou(get)marriedinItaly,you(expect)togiveapresenttoyourguests.2.I(ask)myparentsforhelpifI(be)you.3.Ifyou(come)tomyhouseyesterday,you(see)mycousinJohn.4.IfDr.Smith(travel)toParis,he(take)somepicturesbeforetheEiffel5.IfI(meet)AndyLausomeday,I(ask)himforasignature.6.Givenmoretime,Ben(do)theworkmuchbetter.7.IfSuYang(get)toBeijingoneday,she(visit)theForbiddenCity,wheretheemperorsoncelived.根據(jù)括號中所給中文完成句子。1.（如果我受到你的信），Iwouldhavestartedofftwodaysago.2.Ifyou(有任何問題)，pleasedon’thesitatetoaskyourteacher.3.(要是我女兒沒那么忙)，shewouldcometohelpyou.4.Ifithadn’tbeenforthesnow,we(能早點到達了)。5.Ifsheknewasmuchaboutmusicasyoudo,mydaughter(會演奏得好跟多)。1.Ifshehadworkedharder,she_____.

A.wouldsucceedB.hadsucceededC.shouldsucceedD.wouldhavesucceeded2.Ifmylawyer_____herelastSaturday,he_____mefromgoing.

A.hadbeen;wouldhaveprevented

B.hadbeen;wouldprevent

C.were;wouldprevent

D.were;wouldhaveprevented3.Ifhe______,he_____thatfood.Luckilyhewassenttothehospitalimmediately.

A.waswarned;wouldnottakeB.hadbeenwarned;wouldnothavetaken

C.wouldbewarned;hadnottakenD.wouldhavebeenwarned;hadnottaken4.Ididn'tseeyoursisteratthemeeting.Ifshe_____,shewouldhavemetmybrother.

A.hascomeB.didcomeC.cameD.hadcome5.Youdidn'tletmedrive.Ifwe_____inturn,you_____sotired.

A.drove;didn'tgetB.drove;wouldn'tgetC.weredriving;wouldn'tgetD.haddriven;wouldn'thavegot6._____itraintomorrow,wewouldhavetoputoffthevisittotheYangpuBridge.(1994)

A.WereB.Should7._____Ibefreetomorrow,Icouldgowithyou.

A.CouldB.ShouldC.MightD.Must8._____yourletter,Iwouldhavewrittenbacktwodaysago.

A.IfIreceivedB.ShouldIreceivedC.HadIreceivedD.IfIcouldhavereceived9.Shoulditrain,thecrops_____.

A.wouldbesavedB.wouldhavebeensaved

C.willbesavedD.hadbeensaved10.IfI_____you,Iwouldtryagain.

A.amB.wasC.wereD.be11._____,allthestudentswouldhear.

A.Iftheteacherhadspokenlouder

B.Iftheteacherwillspeaklouder

C.Hadtheteacherspokenlouder

D.Iftheteacherspokelouder12.MrBrown_____ahouseifhehadenoughmoney.

A.willbuyB.wouldbuyC.boughtD.hasbought13._____Iknownheneededmoneysobadly,Imighthavemanagedtohelphim.

A.UnlessB.WhenC.IfD.Had注意：一.錯綜條件句(混合虛擬語氣)有時候條件句所表示的動作與主句所表示的動作發(fā)生的時間是不一致的（如一個是過去發(fā)生的，一個是現(xiàn)在發(fā)生的），這時候動詞的形式要根據(jù)具體的時間來調(diào)整。1.Ifyouthedoctor’sadvice(then),youallrightnow.如果你那時聽了醫(yī)生的話，你現(xiàn)在就好了。2.Ifyouthedoctor’sadvice,youallrightthen.如果你那時聽了醫(yī)生的話，你那時就好了。3.Ifyouthemmore,thecropsgrowingmorebetter.如果你給莊稼多澆些水，它們會長的更好。4.IfIFrench,IabletointerpretforyourFrenchfriends.假如我以前學過法語，現(xiàn)在我能給你的法國朋友當翻譯了。5.Ifyouillforsomanydays,weyougotothebattlefront.要不是你病了好幾天，我們會讓你上前線的。6.Ifyoumyadvice,youwhattodonow.如果你曾采納我的建議，現(xiàn)在你就會知道該怎么辦了。7.IfIyoutothehospitalatonce,youindangernow.當時要不是我立即把你送到了醫(yī)院，現(xiàn)在你恐怕還在危險之中。8.如果你當時聽了我的話，現(xiàn)在就能完成這份工作了。9.如果我是你，昨天我就去參加他的生日晚會了。二．含蓄條件句(SentencesofImpliedCondition)有時，假設的情況不是通過虛擬條件句表示出來，而是通過上下文或其它方式來表示。With,without,butfor,otherwise和or構(gòu)成虛擬。(butfor要不是)Withmoremoney,I(help)morepeopleinneed.Withoutsunlight,people’slife(be)differentfromtoday.Withoutyourhelp,I(fail).Butforyourhelp,I__(notfinish)thework.Butforwater,it(be)impossibletoliveinthedesert.I’mtoobusynow,otherwise/orI(help)youdothework.1.Suchmistakes.(ifwehadbeenmorecareful).2.Heyoumorehelp,buthewassobusy(ifhehadn'tbeensobusy).3.Ibefore,butIhavebeenill.(ifIhadn'tbeenill,Iwouldhavewrittentoyou).4.Iwasillthatday.Otherwise,Iwould(take)partintheparade.（IfIhadnotbeenillthatday）5.ButforJohn,we______thematchlastweek.

A.wouldhavelostB.wouldloseC.hadlostD.lost6.Whatwouldyoudowithamilliondollars?如果你有一百萬美元，你怎么辦？該句相當于Whatwouldyoudoifyouhadamilliondollars?II:虛擬語氣在賓語從句的中的用法1.wish后的賓語從句：從句中的動詞根據(jù)時間可采用不同的形式，參見虛擬條件句：1).IwishIwereasstrong/clever/youngasyou.(ButIamnot.)(be)2).Wewishwepaidmoreattentiontoourpronunciation.(pay)3).Iwishhewouldtry.(will)4).IwishIknewtheanswer.(ButIdon'tknowtheanswer.)(know)5).IwishIhadknowntheanswer.(ButIdidn't.)(know)6).IwishI_____youyesterday?

A.seenB.didseeC.hadseenD.weretosee7).Iwishthetrain_____solate;thenIcouldhavegothomebeforebreakfast.

A.hadn'tarrivedB.didn'tarriveC.wouldn'tarriveD.mustn'tarrive8).IwishI________torepairthebike,forIonlymadeitworse.

A.hadtriedB.hadn'ttriedC.triedD.didn'ttry2.Wouldrather(寧愿)，wouldprefer(希望)后面的賓語從句中表示與現(xiàn)在事實或?qū)砜赡芟喾丛竿麜r，謂語動詞用過去時，表示過去未能實現(xiàn)的愿望時，謂語動詞就用過去完成時。IwouldratherhewouldcomenextSaturday.Iwouldpreferhewouldn’tstaythereforlong.3.表示要求，命令，建議的虛擬語氣。賓語從句。常見動詞：一個堅持，兩個命令，三個建議，四個要求。即1).insist2）.order,command3）.advise,suggest,propose4）.demand,require,request,desire這些動詞后面的賓語從句要使用虛擬語氣用法。即從句中的動詞使用should+動詞原形，或者將should省略。1）.Weproposethatthehouseshouldberepaired(repair).2）.Thegeneralcommandedthatthetargetshouldbefired(fire)at.3）.Theyrequestedthatweshouldsit(sit)downandhaveacupoftea.4）.Wedesirethatheshouldbegiven(give)achance.5）.Therulesrequirethatplayersshouldwear(wear)tennisshoesonthecourt(網(wǎng)球場).6）.Theeditorinsistedthatweshouldchangethetitleofthebook.7）.Weadvisethatstepsbetaken(take)atonce.8）.Isuggestthatwe(should)holdameetingtonight.9）.Heorderedthatall(should)takepartinthework.10）.Theyinsistedthatwe(should)begintheworkatonce.Note1:insist作“堅決認為(該怎么做)”時，用此句型；如作“堅決認為(是怎么回事)”時，則不要求如此：1）.Heinsistedthathe(should)goinsteadofme.2)Heinsistedthatyouwerewrong.()1.MrSmithorderedthatthework_____atonce.A.doB.didC.wasdoneD.bedone()2.Theguardatthegateinsistedthateverybody____therules.A.obeyedB.obeyC.willobeyD.wouldNote2:這類詞只要是表示愿望、建議、命令等，不管是以什么樣的形式出現(xiàn)，后面從句中的形式都要用"should"+動詞原形"：㈠.itisdesired/suggested/requested/ordered/proposedthat等結(jié)構(gòu)后的主語從句：1).ItisrequestedthatMrSmithshouldgiveaperformanceattheParty.2).Itisdesiredthatwe(should)geteverythingreadybytonight.3).Itwasarrangedthatthey(should)leavethefollowingweek.4).Ithasbeendecidedthatthemeeting(should)bepostponed(putoff)tillnextSaturday.㈡.suggestion,proposal,order,plan,idea等后面的表語從句和同位語從句：1).Mysuggestionisthatwe(should)sendafewcomradestohelpthem.Mysuggestionisthatafewcomrades(should)besenttohelpthem.2).Myideaisthatwe(should)dotheworkourselves.3).WhatdoyouthinkofXiaoYang'sproposalthatwe(should)putonaplayattheEnglishevening?1.Theyoungmaninsistedthathe_____nothingwrongand____free.

A.did;setB.haddone;shouldbesetC.do;besetD.haddone;mustbeset2.MothersuggestedthatI_____myhomeworkfirstbeforewatchingTV.

A.didB.doC.shalldoD.havedone3.Mysuggestionwasthatthemeeting_____offstillnextweek.

A.toputB.beputC.shouldputD.beputting4.Thecommanderorderedthatthewounded_____tohospitalrightaway.

A.tobesentB.besentC.sendD.shouldsend

5.Theordercamethatthemedicalsupplies_____tothevillagesoon.

A.wouldbesentB.shouldsendC.besentD.mustbesent6.Thesuggestionhasbeenmade_____thebasketballgame_____putoff.

A.for;toB.that;beC.which;shouldbeD.to;being7.Theyrequestedthathe______ontheradio.

A.spokeB.speaksC.speakD.wouldspeak

8.Theteacherdemandedthattheexam_____beforeeleven.A.mustfinishB.wouldbefinishedC.befinishedD.mustbefinished

9.Shemadethedemandthatshe_____atonce.

A.leaveB.leavesC.leftD.tobeleft4.在句型Itisnecessary/important/strange/that...Itisapity/ashame/nowonder/that...等結(jié)構(gòu)后的主語從句：Note:這時should+動詞原形的意思常常是“競會”。1.Itisnecessarythathe(should)besentthereatonce.2.Itisimportantthatwe(should)unitewithallthatcanbeunitedinthestruggle.3.Itisstrangethatsheshouldhavefailedtoseeherownshortcomings.4.Itisquitenaturalthatsuchfearsshouldarise.5.Itisagreatpitythatheshouldbesofoolish.5.一些習慣句型中：(一)Itis(high)time后的定語從句中通常也需要用虛擬語氣：1.Itistimethatwewent/shouldgotobed.2.Itistimewewenthome.(二)用在ifonly引起的感嘆句中（意思為要是什么就好了），有時還可以省略only：1.Ifonlywetotheiradvice!當初我們要是聽從他們的建議就好了。2.Ifonlytheletterintime!那封信要是及時到達就好了。3.IfonlyIit!我要是沒弄丟它就好了。4.If(only)theyherenow.要是他們現(xiàn)在在這里可就好了。5.Ifonlyheyesterday.昨天他要是來了那就好了。6.IfonlyIasstrongasyou.我要是和你一樣健壯該多好啊。7.IfonlyIabird.我如果是一只鳥就好了。8.Ifonlytherain.要是雨會停止該多好！(三)由asif或asthough引導的狀語或表語從句可以用陳述語氣表示符合事實的情況，也可以用虛擬語氣表示與事實不符或與事實相反的情況。

Whenapencilispartlyinaglassofwater,iflooksasifitwerebroken.Theteachertreatsthestudentasifheherownchild.Ifeltasthoughweeachotherforyears.Itlooksasifitmightrain.天看上去好像要下雨。（不大可能下雨）對比：Helooksasifheisyoung.看樣子他好像很年輕。（他就是年輕）Helooksasifhewereyoung.看樣子他好像很年輕。（實際上他不年輕）1.Johntalkedasifhe______alltheworkhimselfbutinfactHarryandLilydidmostofit.

A.didB.haddoneC.hasdoneD.do2.Hesmiledasifhe_____mythought.

A.readB.wasreadingC.hadreadD.hasread3.Helookedasifhe_____foryears.

A.hasn'twashedB.doesn'twashC.wouldn'twashD.hadn'twashed4.You_____earlier.Thebusleftamomentago.

A.wouldcomeB.shouldhavecomeC.maycomeD.havecome5.Ifonlyhe______quietlyasthedoctorinstructed,hewouldnotsuffersomuchnow.(2000)

A.liesB.layC.hadlainD.shouldlie

6.Itisimportantthatwe______wildanimals.

A.willprotectB.shouldprotectC.shallprotectD.areprotecting7.Itisnecessarythattheproblem_____atonce.

A.solvesB.shouldsolveC.shouldbesolvedD.willbesolved8.Itisstrangethathe_____interestinmuchofhisresearch.

A.shouldhavelostB.wouldloseC.hadlostD.willlost9.IfonlyI_____mywatch!

A.hadn'tlostB.haven'tlostC.didn'tloseD.don'tlose10."Whatw