高中英语语法专题复习课件--情态动词 22页

情态动词\n考点归纳\n1.常用情态动词的用法比较1)在表示“可能性”方面must,can,should,may,might都可以用于表示“可能性”。a.must表示以事实为依据而进行的逻辑上的推理，它所指的动作或状态发生的可能性最大。\nb.can和should表示以事实、理由为依据而进行猜测，它们所指的动作有发生的可能性，但语气没有must那么肯定。其中，should的主观性较强。c.may和might语气较弱，表示说话人根据自己的主观判断而进行的猜测。其中，might的语气更弱一些。\n2)在表示“允诺”方面can,may,might都可以表示“允诺”，其中might最为客气、委婉。如：YoucanwatchTVforaslongasyoulike.MayIuseyourphoneplease?MightIpossiblyborrowyourumbrellaplease?\n3)在表示“应该”方面must,oughtto,should都能用来表示“出于某种职责、义务而应该”的意思。must的语气最强烈，oughtto居中，而should是表达这方面意思的普通词。如：Youmustcutdownonsmoking.Yououghttovisityourparentsmoreoften.Youshouldtrythatnewrestaurant.\n2.情态动词的特殊用法1)shall用于第一人称表示坚强的信念和决心；用于第二、三人称，表示许诺、命令或规定等。如:Weshallnotfail.Ifyoureallywantadog,youshallhaveone.Sheshallnotstayundermyroof.Candidatesshallremainintheirseatsuntilallthepapershavebeencollected.\n2)should表示惊讶等感情,意为“竟然”。如：It'soddyoushouldmentionBen!Iwasjustthinkingabouthim.3)must表示说话人的不满，意为“偏要,硬要”。如：Ericmustcomeandworrymewithquestions,justwhenIambusycookingthedinner.Ifyoumustsmoke,pleasegooutside.\n4)may表示祝愿;mayaswell用来提出建议,意为“还是……的好”;maywell用来表示可能性，意为“很可能”。如：Mayyoubehappy!Youmayaswelltellusnow.We'llfindoutsoonerorlater.Hisappearancehaschangedsomuchthatyoumaywellnotrecognizehim.\n3.“情态动词+havedone”结构1)could/might/should/oughtto/needhavedone意为“本来能/可能/应该/需要做……，但实际上未做……”。如：Hecouldhaveescaped,buthechosetostandandfight.Itwasaneasytestandheshouldhavepassed,buthedidn't.\n2)“情态动词+havedone”还可用来表示推测过去可能发生的事情。如：Didyousayanythingthatmighthaveupsether?\n真题再现\nI.选用括号内合适的内容填空。1.Ilovetheweekend,becauseI________(needn't,mustn't)getupearlyonSaturdaysandSundays.(北京2016)2.Itwasreallyannoying;I________(couldn't,shouldn't)getaccesstothedatabankyouhadrecommended.(天津2016)needn'tcouldn't\n3.—Can'tyoustayalittlelonger?—It'sgettinglate.Ireally_______(can,must)gonow.Mydaughterishomealone.(北京2015)4.Lifeisunpredictable;eventhepoorest________(shall,might)becometherichest.(江西2014)mustmight\n5.George________(mustn't,can't)havegonetoofar.Hiscoffeeisstillwarm.(浙江2016)6.I________(needn't,couldn't)haveworriedbeforeIcametothenewschool,formyclassmateshereareveryfriendlytome.(天津2015)needn'tcan't\n巩固练习\nI.选用方框内合适的情态动词填空(每词限用一次)。canshallmayshouldneed1.—IsDavidcomingbytrain?—Heshould,buthe________not.Helikesdrivinghiscar.2.Noreader________removeabookfromthelibrarywithoutthepermissionofthelibrarian.shallmay\n3.Thegirl________notbeMary—she'sinNewYork.4.Thatthewell-dressedyoungman________speaktoyoulikethatisquiteastonishing.5.Haven'tyouseenthesign“Noparking”here?Cars________notbeparkedhere.mustcanshouldcanshallmayshouldneed\nII.选用括号内合适的内容补全下面短文。Wemakedecisionsallthetime,butwe1.________(can,must)neverbecertainwhetherwearerightorwrong.Theworkyouchoosetodo2.________(may,should)besuitableforyouornot.Thepersonyoumarry3.________(shall,might)beaperfectmatchortheworstpossiblechoice.Supposeyouhavesavedmoneyforthemightcanmay\nfuture.You4.________(could,must)investitwiselysothatitgrowsinvalueoryou5.________(could,must)losealotinafoolishmoment.Youthinkyouhaveahealthydiet,butthefoodyoueat6.________(should,may)actuallybeverybadforyouand7.________(should,might)bethecauseofaterribleillness.Perhapsyoutravelalotbyplane.Alltheflightsyoumakeareroutine,couldcouldmaymight\nbutoneofthem8.________(must,could)beyourlast.Decisions!Decisions!Youmayask:9.________(can,must)Imakedecisions?Theanswerisyes.Inmostcases,you10.________(can't,needn't)skipthisprocess.mustcouldcan't\n