高一英语语法情态动词[公开课件].ppt

Unit2GrammarandUsage,Modalverbs,Unit2GrammarandUsage,Modalverbs,CanyousingtheEnglishsong?,Whatsthedefinitionofmodalverbs?,情态动词是一种本身有一定的词义,表示说话人的情绪,态度或语气的动词,但不能单独作谓语,只能和其他动词原形构成谓语。,Whatarethefunctionsofmodalverbs?,一.Weusemodalverbstotalkabout:,1.Ability（能力）2.Obligation（义务）3.Certainty（可能性）4.Permission（允许）,二.Wealsousemodalverbsto:,5.Makerequests（提出请求）6.Makesuggestions（提出建议）7.Makeoffers（提供帮助）8.Giveadvice（提出意见）,Howcanwedealwithexercisesconcerningmodalverbs?,Functionsitmustbetoldwhattodo.A.cantB.couldntC.maynotD.mightnot,A,may_can_,表主观“可能”,表客观“可能”,cannot_maynot_,不可能,可能不,may和can,They_bedoingtheexperimentinthelab.Why？Becausethelightsarestillburning.,A.couldB.canC.mustD.would,Pairwork,3.must,Makeupadialogueusingmust/mustntandthepicture.(atleastfoursentences),must表主观意志，而haveto表由于客观因素不得不做完成的事情。must没有过去式，除在间接引语中可表示过去的时间。在直接引语中表示过去的时间用hadto代替。Itoldherthatshemustgiveupsmoking.,比较must,2.尤其用于：,*否定句及疑问句中;,*在if/whether之后;,*或与hardly,never,noone,nobody连用;,3.常以neednt和darent的形式出现;,4.dare有其过去时dared.,多用于肯定句;needtododaretodoneedtobedoneneeddoing,1.判断正误:,Howdareyousaysuchathing?Howdareyoutosaysuchathing?,HedarenttospeakEnglishbeforesuchacrowd,didhe?HedarentspeakEnglishbeforesuchacrowd,darehe?,Exercises,Nobodyneedtobeafraidofcatchingthedisease.Nobodyneedbeafraidofcatchingthedisease.,Thesedishesneedbecleanedcarefully.Thesedishesneedtobecleanedcarefully.Thesedishesneedcleaningcarefully.,表示否定的情态动词的用法:部分情态动词的否定式是情态动词中的考点之一。,mustnt不准,禁止neednt没必要(=donthaveto)cant不能;不可能maynot不可以;可能不shouldnt不应该(=oughtnotto),Attention:,Letshaveatry!,最新高考真题链接,2010届高考真题再现,（10四川）1.Itakethebookout?Imafraidnot.A.WillB.MayC.MustD.Need,考点：考查情态动词。解析：表请求可用情态动词can,may,could,might,表允许用can,may.句意为：“我可以将这本书带出去吗？”“恐怕不行”。故应选表请求的情态动词may。正确答案为B。,答案：B,(10陕西）2.MayItakethisbookoutofthereadingroom?No,you.Youreaditinhere.A.mightntB.wontC.needntD.mustnt,解析：考查情态动词。英语中用could，might表示询问或征求意见的问句中，肯定性应答要用can或may来代替could或might，而may或might征求意见的问句否定应答时要用mustnt，表示禁止.故本题选D。,答案：D,（10湖南）3.Youbuyagift,butyoucanifyouwantto.A.mustB.mustntC.havetoD.donthaveto,考点：情态动词解析：donthaveto意为“没有必要”，符合语境，句意为：“你没有必要买礼物，但如果你想买的话，你也可以买。”,答案：D,（10浙江）4.“You_haveawrongnumber,”shesaid.“Theresnooneofthatnamehere.”A.needB.canC.mustD.would,考点：情态动词解析：肯定猜测，用must,答案：C,（10全国）5.ImafraidMr.Harding_seeyounow.Hesbusy.A.cantB.mustntC.shouldntD.neednt,解析：情态动词考查。结合语境，根据情态动词用于疑问或否定推测时，要用cant。,答案：A,Yes,wecan.,Canwepassourcollegeentranceexaminationaftertwoyears?,Groupwork,Haveadiscussion:Whatcanweseniorschoolstudentsdoatschool?Whatcant/mustntwedoatschool?Whatdowehavetodoatschool?What?,翻译句子(利用情态动词),1.昨晚那间屋子着火了，但那家人都逃了出来;2.我不会告诉老师这件事;3.办公室不能抽烟;4.灯还亮着，他肯定在书房读小说;,1.Thehousecaughtfirelastnight,butthefamilywasallabletoescape.,翻译句子(利用情态动词),4.Thelightisstillon.Hemustbereadinginthestudy.,3.Youmustntsmokeintheoffice.,2.Iwonttelltheteacheraboutit.,Homework,Reviewtheusageofmodalverbsandfinishtheexercisepaper,Thankyou!,2.熟悉情态动词委婉用法：could,would,might等情态动词均有委婉用法，它们不是过去式而是表示语气委婉、客气、礼貌，常用与疑问句，并多用于习惯表达，如wouldyouplease,wouldyoumind,wouldyouliketo等，might还可以用于肯定句表示推测，表示可能性