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情态动词不能单独作谓语，它必须和动词原形连用一起构成谓语。一、情态动词的情态意义表示法考点一：can可表示现在或将来的能力，意为“能；会”。can还可表示请求、允许，意为“可以”。如：GabriellacanspeakFrenchfluently.Canyouhelpmeliftthisbox?考点二：could可表示过去的能力；当could表示允许时，语气比can更加委婉和客气。如：CouldIhaveadrinkofwater,please?考点三：may表示请求、允许，意为“可以”。如：MayIcomeinandwait?Thankyou.Youmaygonow.考点四：might表示允许时，语气比may更加委婉和客气。如：MightIborrowyourpen?考点五：must表示义务、命令或必要，意为“必须”，强调主观看法。mustn’t表示“不允许；禁止”之意。如：Allpassengersmustwearseatbelts.Youmustn’ttalktoyourmotherlikethat.考点六：haveto意为“不得不”，强调观需要。如：Itisgettinglate.Ihavetogo.考点七：should意为“应该”，既可以表示义务或责任，还可以表示劝告或建议。其否定式为shouldn’t，意为“不应该”。如：Youshouldreadhisnewbook.It’sreallyinteresting.Childrenshouldn’tbeallowedtoplayinthestreet.考点八：hadbetterdosth.意为“最好做某事”，其否定式在better后加not。如：You’dbetter(not)seethefilmyourself.考点九：need表示“需要”，作情态动词时，通常用于否定句或疑问句中。【中考链接】1.Jennyfinallygotthejobbecauseshe______speakEnglishwell.A.mightB.mustC.could2.—Howdoyouusuallygotoschool?—Myschoolisfaraway.I______takethebustoschool.A.mustB.mightC.haveto3.It'ssurprisingthatMr.Ma'slittledaughter______speakEnglishsowell.A.mustB.canC.mustn'tD.can't4.Asmiddleschoolstudents,we______beafraidofdifficultiesifwewanttomakeourdreamscometrue.A.mustB.shouldn'tC.need5.Cars,buses,bikesandpeople______stopwhenthetrafficlightsarered.A.canB.mayC.must二、情态动词表示推测考点一：can表示推测时常用于否定句中，此时can’t意为“不可能”。如：Thatcan’tbehismother.She’snotthatold.考点二：could常用于肯定句中，表示不确定的推测，意为“可能”。如：Youcouldberight,butIdon’tthinkyouare.考点三：may表示推测，意为“可能；也许”。如：Imaybelate,sodon’twaitforme.考点四：might表示推测时，比may的可能性更小。如：Shemightnotwanttocomewithus,Iguess.考点五：must表示推测时常用于肯定句中，表示很有把握的推测，意为“一定”。如：Themachinedoesn’twork.Theremustbesomethingwrongwithit.1.—Look!It______beDavidintheclassroom.—It______behim.BecauseIsawhiminthelibraryamomentago.A.may;mustn'tB.must;can'tC.can;can'tD.mustn't;can【中考链接】2.Harry'sbeendrivingallday—he______betired.A.needB.canC.shallD.must3.—Look!Themanatthegate______beourheadmaster.Heisalwaysstandingthereeverymorning.—No,it______behim.Heisholdingameetingintheofficenow.A.must;can'tB.must;mustn'tC.can't;can'tD.can't;mustn't4.—Ihavebeentothemoontwice.—You______bejoking!It'simpossible!A.canB.mayC.mustD.need5.—DoyouhaveanyplansforthisSunday?—I'mnotsure.I______gotothecountrysidetoseemygrandmother.A.canB.mustC.mayD.need三、情态动词一般疑问句的回答考点一：may表示请求时，用于主语为第一人称的一般疑问句中，其否定回答不用maynot，而用mustn’t或can’t。如：—MayIuseyourglassesforafewminutes?—No,youmustn’t/can’t.考点二：在回答由must引起的一般疑问句时,肯定回答常用must,否定回答常用needn’t或don’thaveto，表示“不必”。如：—Mustwefinishthisprojecttoday?—Yes,youmust./No,youneedn’t/don’thaveto.考点三：在回答由need引起的一般疑问句时，肯定回答用must，否定回答用needn’t。如：—NeedIbringyouacoat?—Yes,youmust./No,youneedn’t.考点四：在回答由could(表示委婉语气)引起的一般疑问句时，常用can/can’t回答。1.—MustIfinishallthehomeworkthisevening?—No,you______.TomorrowisSaturday,andyouhaveenoughtimeforit.A.mustn'tB.needn'tC.won'tD.can't【中考链接】2.A:Mum,mayIgoouttoplayfootballforanhour?B:No,you______.Theairoutsideisnotveryclean.A.can'tB.needn'tC.couldn't3.—MustIhandintheexercisebooktoday,MissGreen？—No,you______.Takeyourtime.Justtomorrow.A.shouldn'tB.needn'tC.mustn'tD.can't4.—MustIsingthesonginRussian?—No,you______.It'suptoyou.A.mustn'tB.can'tC.don'tD.needn't5.—CanyoucometomypartyonWednesday?—Sorry,I______.Ihaveapianolesson.A.can'tB.couldn'tC.mustn't