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1、初中英语语法讲义一情态动词姓名一.金义：情态动词表示说话人.对某种动作和状态的看法，但情态动词不能单独作谓语，一般只能和动词连用构成谓语。部分情态动词有过去式，但没有人称和数的变化。二情态动词白勺才寺征1有一定的词义，但不能单独作谓语，必须和行为动词或系动词连用，构成谓语。2无人称和数的变化（haveto例外；用于第三人称单数时用hasto）。如：Wemuststayhere.Hemuststayhere.Wehavetowalkhome.Hehastowalkhome・3后接动词原形，即不带to的不定式。Shemayloseherwa
2、y.4具有助动词的作用，可用来构成否定句，疑问句及用于简明答语。CanyousinganEnglishsong?Yes,Ican.三扌青态动词的用法l.can,could的用法①表示能力,能，会如:Canyouplaybasketball?ShecanspeakalittleEnglish.（06,福建）.一Let'sgodancingtonight・一Sorry,I.Ihavetogotoameeting.A.can'tB・mustn'tC・maynotD.needn't（06苏州）TheWorldWideWebissometimes
3、jokingly（开玩笑地）calledtheWorldWideWaitbecauseitbeveryslow・A.shouldB.mustC・willD.can②表怀疑，猜测，常用于否定句和疑问句中Hecan'tbeintheroom.（06,黑龙江课改）——Listen!Lilyissinging.ThatbeLily.Sheisinthelibrary.Amustn'tBwouldn'tCcan't③表请求或允许，都用于口语中，意为“可以”，相当于may如:Youcan（may）gonow.（06,甘肃金昌）-…Couldyoup
4、leasepassthebookontheshelftome?-…・AYouarewelcomeBNo,Icouldn'tCCertainly.Hereyouarc.DYes,Icould（06四川）一CouldIhavealookatthephotoofyourfamily,Sam?—Ofcourseyou・A.mayB.canC・could（06湖州）一Whyise-shoppinggettingmoreandmorepopular?——Itsavealotoftroubleandtimeifitisproperlyused・A.n
5、eedB.shouldC.canD・hasto（05海淀）一Excuseme,youtellmethewaytothenearestbusstation?—Sorry,Icarft・I'mastrangerhere.A.mayB.needC.mustD.can④could是can的过去式，可以表示过去的能力如：IcouldswimwhenIwassevenyearsold.2may的用法①表推测，意为“可能，也许”，用于肯定句中如：Hemaycometomorrow.（06山东济宁课改）…Ben,don'tdrivetoofast.Yo
6、uhittheothers'cars.A.mustB.canC.mayD.need（07苏州）——IsJohncomingbytrain?——Heshould，buthenot.HelikesdrivinghiscarAmayBmustChavetoDshould（07朝阳一模）一MayIputmybikehere?—No,you.Putitoverthere,please.A.needn'tB.won'tC.mustn'tD.wouldn't（06沈阳）・一Whoseguitaristhis?—ItAlice.Sheplaystheg
7、uitar.A.mightbeB.mustbeC・canbelongD.mightbelongto（06绍兴）一Excuseme,isthistherightwaytoNo.1MiddleSchool?一Sorry,I'mnotsure.Butitbe.A.canB・needC・mustD.may（03,天津）YougoandaskMeimei.Sheknowtheanswe匚Amust;canBmust;mayCneed;canD・can;may（07江西）…AreyougoingtoBeijingbyplane?一-It，sfast
8、.butexpensive.SoIamnotsure.Itakeatrain.A.shouldB・mayC・mustD.will①表请求，许"J,意为“可以”MayIborrowyourbook?May表请
