GrammarModalverbsUnit2SportseventsModalverbsUnitUnit2Sportsevents---GrammarTeachingaims&demands(目标/要求):1.ShowSsthatmodalverbscanbeusedtotalkaboutability,obligation,certaintyorpermission,tomakerequests,suggestions,offersandtogiveadvice.2.Enablestudentstounderstandthatsomemodalverbscanbeusedwiththecontinuousformandtheperfectformtotalkaboutcurrentaffairsorpastactions.Warming-upexercises1.He____speakEnglishfluently.(表能力)2.You_____workhardtowinthegoldmedals.(表责任/义务)3.______wedosomeexercisesthismorning?(表征求对方意见)4.---MightIwatchTVaftersupper?---Yes,you________.A.mayB.mustC.mightD.could5.---MayIpickaflowerinthegarden?---________.A.No,youneedB.No,pleaseC.No,youmustn’tD.No,youwon’tmustcanShallAC一．情态动词的语法特征情态动词表示说话人对某一动作或状态的态度，可以表示“”可能、“”“”“”“”可以、需要、必须或应当等之意。情态动词没有人称和数的变化。情态动词不能单独作谓语动词用，必须和不带to的不定式连用构成谓语动词。Modalverbs:generalintroduction二．情态动词的语法功能Wecanusemodalverbstotalkabout:abilitycertaintypermissionobligationmakerequestsmakesuggestionsmakeoffersgiveadvice能力义务,责任确定允许提出请求提出建议提供帮忙提出忠告Modalverbs:generalintroduction情态动词1.cancouldbeableto2.shall4.maymight三．常见情态动词的基本用法3.musthaveto7.willwould5.needdare6.oughttoshould8.情态动词+havedone情态动词1.cancouldbeableto2.shall4.maymightTheusageofsomecommonmodalverbs3.musthaveto5.情态动词+havedone①can表示本身所具有的能力或潜能，could是其过去式*我认为没有你的帮助他不能解决这个问题。Idon'tthinkhecansolvetheproblemwithoutyourhelp.*两年前Rose就能自己烧饭了。Rosecouldcookmealsforherselftwoyearsago.1.情态动词can,could和beableto的用法Notice:(1).beableto表示能力,有人称和数的变化,可用于各种时态;(2).can表示客观可能性,常指现在,较常用,过去式为“could”;如果只表示能力时,can=beableto(3).could仅表示过去具备某种能力,而was/wereableto表示不仅具备而且实施了某种能力;更侧重于“克服一定困难,经过一定努力做成某事”=managedtodosth.=succeededindoingsth.E.g:*Hewasabletoswimacrosstheriverbeforetheshipsank.【Practice】*Hemanagedtogettheradiorepairedwithoutanyhelp.=He______________/________________theradiorepairedwithoutanyhelp.wasabletogetsucceededingetting*据说我们下周要进行期中考试,这消息是真的吗？It’ssaidthatwewillhavethemid-termexamnextweek.现在:could/can’tbe过去:can’t/couldn’thavedonebecauseImethiminhisofficejustnow.*他不可能去了国外，因为我刚刚在他的办公室遇见他。Canthenewsbetrue?Hecan'thavegoneabroad,②can和could还可用于表示对事情可能性的推测(常用于否,疑句中)E.g:---CouldIuseyourpen?(语气委婉)---Yes,youcan.No,youcan’t/mustn’t.④过去式could常用于疑问句中,比can更加委婉,表示礼貌。肯定回答时,常用原形can或者may,不可再用过去式could。*吸烟往往会导致癌症。Smokingcancausecancer.*Itcanbeverycoldhereinwinter.这的冬天有时会很冷。③在肯定句中,can还可表示“有时会,”往往会2.shall用法shall常用于第一,三人称疑问句中,表示征求对方意见,用于二、三人称陈述句中表示意图、决心、命令、警告、允诺、强制等,在法律法规等文件中表示义务或规定,可译为“必须,应该,可以”等。Shallhecleantheblackboardforyou?Takeiteasy.You_________beofferedajobinthiscompany.Mike___________sparenoefforttostudy.(1)“Theinterest______bedividedintofivepartsaccordingtotheagreementmadebybothsides.”declaredthejudge.A.mayB.shouldC.mustD.shallshallshallD“表法律法规等文件中表示义务或规定”(2)---Excuseme,butIwanttouseyourcomputertotypeareport.-...
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