Unit9Canyoucometomyparty?第二课时SectionA(GrammarFocus—3c)情态动词can的用法情态动词有一定的意义，但是没有人称和数的变化，其后跟动词原形共同作谓语，表示说话人的语气和情态。can的否定式为can't，其过去式为could，could对应的否定式为couldn't。情态动词can的用法如下：1．表示能力，意为“会；能”。Canyouplaytheguitar?你会弹吉他吗？2．表示请求或许可，意为“可以；能够”。用在疑问句中客气地请求某人做某事或发出邀请，could比can更加委婉。Couldyoupleasehelpmewiththehousework?请你帮我做家务，好吗？(1)Canyou…？意为“你可以……？”，相当于Wouldyouliketodo…？表示说话者的请求。其对应的肯定回答：Sure,I'dloveto.；否定回答：Sorry,Ican't.—Canyoucometomybirthdayparty?你能来参加我的聚会吗？—Sure,I'dloveto.是的，我很愿意(2)CanI…？意为“我可以……吗？”，用来询问对方是否允许自己做某事。肯定回答：Yes,youcan.否定回答：Sorry,youcan't.—I'mhungry.CanIhaveanapplenow?我饿了。现在我可以吃一个苹果吗？—Sure.Youcan.当然可以。Couldyouplease…？是比Canyouplease…？更加委婉的语气，这类请求句型的否定回答往往用can't，而不用couldn't。3．表示可能性，意为“可能”。如：Theweatherherecanbequitehotinsummer.这里的夏天可能相当热。4．表示推断，多用于否定句和疑问句中。Tonycan'tbehere.BecauseIsawhiminthestreetamomentago.汤尼不可能在这儿。因为刚才我看见他在大街上。5．表示“禁止”，多用于否定句中。Youcan'tgoouttomeetyourfriendsonschoolnights.在上学期间的晚上，你不能出去和朋友们见面。Ⅰ.单项选择。()1.—youtellusastoryinEnglish?—Certainly!A．MustB．ShouldC．CouldD．MayC()2.—CanIswimintheriver,Grandpa?—．Itisdangerous.A．Yes,youcanB．No,youcan'tC．Yes,youneedD．No,youneedn'tB()3.—Wouldyoucometomybirthdaypartytomorrowevening?—I'mafraidI．Ihavetolookaftermygrandparents.A．wouldn'tB．can'tC．won'tD．mustn'tB()4.JennyfinallygotthejobbecauseshespeakEnglishwell.A．mightB．mustC．couldD．canCⅡ.句型转换。5．JackcanusetheInternettolearnEnglishafterschool.(改为一般疑问句)JacktheInternettolearnEnglishafterschool?6．diaries,keep,English,in,can,Alice(.)(连词成句)CanuseAlicecankeepdiariesinEnglish.7．CanyouplaysoccerwithusthisFriday?(作肯定回答)，．8．CanyougoshoppingwithmethisMonday？(作否定回答)，.Ihavealotofworktodo.SureI'dlovetoSorryIcan't()1.(2017·岳阳)—Canyougotothemovieswithme?—，butIhavetoomuchhomeworktodo.A．I'dlovetoB．That'sallrightC．Yes,IthinksoA()2.(2016·重庆)HespeakEnglishverywellalthoughhehasstudieditforonlyoneyear.A．mustn'tB．can'tC．mustD．canD【解析】句意：他英语能说得很好，尽管他只学了一年。只有情态动词can符合语境。
