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ModalverbsModalverbscancanandandcannotcannotWeuseWeusecancanandandcannot(can't)cannot(can't)tosaywetosayweareableorunabletodoareableorunabletodosomething.something.用法①beableto能，能力e.g.我可以唱一首英语歌曲。Ican/amabletosinganEnglishsong.②过去式：coulde.g.我十年前就能做到那样。Icoulddothat10yearsago.③否定式：cannot=can’t④情态动词can+V.原结构①肯定→Sb+can+V.原+其它.eg:PetercanspeakEnglish.②否定→Sb+cannot/can’t+V.原+其它.eg:Petercan’t/cannotspeakEnglish.③一般疑问句→Can+Sb+V.原+其它+?eg:CanPeterspeakEnglish?④特殊疑问句→特殊疑问词+can+Sb+V.原+?eg:WhatcanPeterspeak?()1.----____youhelpmewiththisMathsproblem?----I____notworkitout.A.Can;mayB.Must;mustC.Can;canD.May;may()2.Theboy____runveryfast.HewantstobeatoprunnerasLiuXianginthefuture.A.canB.can’tC.mayD.maynot3.Excuseme,____youtellmethewaytothenearestpark?4.You________gowithustothezooifyouwantto.5.I____speakChineseverywell,butI____speakFrenchatall.Exercise