湖北省荆州市沙市第五中学八年级英语下册 Unit 3 Could you please clean your room课件2 （新版）人教新目标版 (2).ppt

sectionagrammar,八下英语unit3couldyoupleasecleanyourroom?,enjoydinnerwithmyfamily.,a:mum,couldigooutfordinnerwithmyfriends?b:sure,thatshouldbeok.,a:couldigetsomethingtodrinkwithmyfriendsafterthemovie?b:sure,youcan.,a:couldigetsomethingtodrinkwithmyfriendsafterthemovie?b:no,youcant,youhaveabasketballgametomorrow.,takethedogforawalk,遛狗,a:canyoupleasetakethedogforawalk?b:ok,butiwanttowatchoneshowfirst.,takeouttherubbish,扔垃圾,a:canyoupleasetakeouttherubbish?b:yes,sure.,grammarfocus,情态动词用法,只作情态动词的can/could,may/might,oughtto,must可情态可实义的need,dare可情态可助动词的shall/should,will/would相当于情态动词的haveto,usedto,情态动词的语法特征,1)情态动词不能单独做谓语,除ought和have外,后面只能接不带to的不定式。,2)情态动词没有人称,数的变化,但有些情态动词,如can、will也有一般式和过去式的变化。,3)情态动词的“时态”形式并不是时间区别的主要标志,不少情况下,情态动词的现在式形式和过去式形式都可用来表示现在时间、过去时间和将来时间。,1)can的主要用法是：a.表示体力或脑力的能力：e.g.thegirlcandanceverywell.b.表示说话的推测事物的可能性等:e.g.canthenewsbetrue?c.在口语中,can可以表示请求或允许:e.g.canisithere?,can和could：,can表示“能够”时与短语beableto同义，但can只用于一般现在时或过去时，而后者可用于各种时态。另外，can表示个人有某种能力，而beableto表示某人通过努力、克服困难做成某事，相当于succeedindoingsth.；叙述过去事实时，最好用was/wereableto，因为could只表示过去具有某种能力。,如：canyouunderstandthedifferentkindsofenglishthesepeopleareusing?twoyearslater,hewasabletospeakverygoodchinese.,2)could的主要用法是：a.could是can的过去式,表示与过去有关的能力和推测:e.g.weallknewthattheyoungmancouldntbeadoctor.b.could可以代替can表示请求,但语气较can客气、委婉:,e.g.couldyoulendmeyourdictionary?couldiuseyourbike?3)can和could接动词的完成形式，表示可能已经做某事。can用在否定和疑问句中,表示不相信、怀疑等态度。e.g.theycanthavegoneoutbecausethelightisstillon.,以could或would提问时，不能再以could或would作答，而应该用can或will。如：couldiborrowyourdictionary?yes,ofcourseyoucan.,情态动词用法小结1.情态动词不能表示正在发生或已经发生的事情,只表示期待或估计某事的发生。2.情态动词除ought和have外,后面只能接不带to的不定式。,3.情态动词没有人称，数的变化，即情态动词第三人称单数不加-s。4.情态动词没有非谓语形式，即没有不定式、分词等形式。,could与can的区别could与can都是情态动词,could是can的过去式。二者都可用于表示请求,但是用法稍有不同。,can表示一般性的请求，语气随便,常用于熟人之间或长辈对晚辈,上级对下级的场合。e.g.canyoutellusyourstory,tony?tony，你能给我们讲讲你的故事吗？,could表示有礼貌的请求，语气委婉，常用于非熟人之间或晚辈对长辈，下级对上级的场合。比如：-couldyoutellusifitsnowsinwinterinaustralia?-sure.-请告诉我们,澳大利亚冬天下雪吗?-当然可以。,注意：1.提出委婉的请求在回答中不可用could。a:couldihavethetelevisionon?b:yes,youcan./no,youcant.2.在否定、疑问句中表示推测或怀疑用couldnt。hecouldntbeabadman.他不大可能是坏人。,may和might表示允许或请求;表示没有把握的推测;may放在句首,表示祝愿。maygodblessyou!hemightbeathome.注意:might表示推测时,不表示时态，只是可能性比may小。,1.两词都是“必须”的意思,haveto表示客观的需要,must表示说话人主观上的看法,既主观上的必要。,haveto和must,mybrotherwasveryill,soihadtocallthedoctorinthemiddleofthenight.我弟弟病得很厉害，我只得半夜里把医生请来。(客观上需要做这件事)hesaidthattheymustworkhard.他说他们必须努力工作。(主观上要做这件事),2.haveto有人称、数、时态的变化,而must只有一种形式。但must可用于间接引语中表示过去的必要或义务。hehadtolookafterhissisteryesterday.,3.在否定结构中:donthaveto表示“不必”,mustnt表示“禁止”。youdonthavetotellhimaboutit.你不一定要把此事告诉他。youmustnttellhimaboutit.你一定不要把这件事告诉他。,4a.writerforrequestsandpforpermissions.thenmatcheachonewiththecorrectresponse.,_couldihangoutwithmyfriendsafterthemovie?2._couldyoupleasepassmethesalt?3._couldiborrowthatbook?4._couldyouhelpmedothedishes?5._couldyoulendmesomemoney?,p,r,p,r,r,yes,hereyouare.hmm.howmuchdoyouneed?yes,sure.noproblem.ifinishedreadingitlastnight.d.yes,butdontcomebacktoolate.e.no,icanticutmyfingerandimtryingnottogetitwet.,1d2-a3-c4-e5-b,4bfillintheblanksintheconversation,a:ihateto_chores.b:well,ihatesomechorestoo,butilikeotherchores.a:really?great!_iaskyouto_mewithsomechoresthen?b:whatdoyouneedhelpwith?a:_youplease_myclothesforme?b:idontwanttodothat!itsboring!,could,do,help,could,fold,a:ok.then_you_dothedishesforme?b:sure,noproblem.but_wegotothemoviesafterthat?a:sure,illfinishmyhomeworkwhileyouhelpmewiththedishes.thenwecangotothemovies.,could,please,could,4cmakealistofthingsyourgroupneedstodoforacampingtrip.thendiscusswhowilldobringatentthemandcompletethechart.,a:couldyoupleasebringliuchang?b:sure.andcouldyouplease?c:sorry,icant.ihaveto,pairwork,用情态动词can/could,cant,may,must,mustnt,neednt填空。1.-_youcomeandplaywithusnow?-imafraidi_.i_dothecooking.i_comelater.2.-_wecleanthewindowstoday?-no,you_.you_cleanthemtomorrow.,could,cant,must,can,must,neednt,can,3.-_iwatchtvthisevening,mum?-no,you_.work_comefirst.4.-_icomein,please?-yes,please.5.excuseme._youtellmethewaytothecinema?,may,mustnt,must,can,can,a:couldyouhelpme,please?b:_!a:iwantto_theseboxestomyhomelets_theboxes_thecarnow.b:_right.a:oh,thebox_heavy.canyoucarryit?b:yes,i_a:_you_ittomyroom?b:certainly.,完成对话,certainly,take,put,in,all,is,can,could,take,can;couldwheniwasyoungi_climbanytreeinthe