人教版新课标英语必修3 unit2 Grammar ppt 课件.ppt

Grammar,_,主要情态动词,Can,couldMay,mightMustOughttoNeedDare,dared,can,表能力：Icanreadveryfast.表客观可能性：Marycantbetheleader.表允许：Youcantakeitaway.表怀疑：Howcanyoufinishit?,could,表能力/可能性：Couldyoufinishitsoon?表怀疑：Hecouldnotbe50.委婉地提出问题：Couldyoushowmethepassport?用于虚拟：Ifyouhadcome,youcouldhavegotawonderfulgift.,may,询问或说明可不可以做：MayIaskyouaquestion?表可能会发生：Hemaygetangry.表目的或让步的从句：Comehereintimesothatyoumayseethesinger.,might,表可能的事：（同may）表目的从句：（同may）用于虚拟：Ifyouhadfinishedit,thebossmighthavegivenyousomepromotion.,must,表必须做的事：YoumusthandinyourhomeworkthisFriday.表揣测：Itmusthaverainedlastnight.表“偏偏”的意思：Hemustgetafeverwhenwewerereadytogetoff.,Oughtto,表应该做的事：Yououghttodoitcarefully.表非常可能的事：Heoughttobeherebynow.,need,表需要；主要用于否定句或疑问句：Weneednthurry.可用于否定意思的句子：Idontthinkyouneeddoit.作及物动词，和不定式连用：Hedidntneedtosaythattoher.,dare,表“敢于”，主要用于疑问句、否定句和条件从句：Hedarenottellhimthenews.作及物动词，与不定式连用：Wedontdaretoenterthehouse.,shall用于第一，三人称疑问句，征求意见或请求shall第二，三人称陈述句,命令,警告,允诺,威胁should表劝告，建议，命令，顺理成章oughtto表应该，语气should美语中，oughtto用于否，疑句时to可省。多数情况下，oughtto可与should互换使用。疑问句中常用should代替oughtto。Oughtto的反意疑问句用shouldnt替代。Oughtto表示“想必会”时语气较must弱。,shall,should&oughtto,你最好不要抽烟了。Youshould/oughttostopsmoking.,YououghttohavehelpedhimwithhisEnglish,_?wontyouB.oughtnotyouC.shouldntyouD.wouldntyou,他们想必已到那儿了。Theyoughttobetherebynow.(语气较must弱),比较hadbetter,should&oughtto,三者均表示建议，意为“应该”，“应当”或“最好做”.三者的语气程度为渐强。Hadbetter指一般性的建议，最弱。Should&oughtto含义相近，常可互换。区别在于，oughtto常指特殊情况下的“应当”。Should则指一般情况。见例句。,Yououghttohelphimbecauseheisintroublenow.(语气强，有命令意味。)Youshouldhavearestafterfinishingyoursports.（一般性建议）,haveto,haveto表示客观需要去做的事情，意为“必须，不得不。”Ihavetogetthestationearlytocatchthefirsttrain.Wemissedthebussowehadtowalkhome.Wehavetoovercomeallkindsofdifficulties.,Haveto有多种时态。常见的有：一般将来时Wewillhavetogatherattheschoolgateat7tomorrow.一般现在时Ihavetotakemoremoneywithmebecausemygirlfriendhassomuchtobuy.一般过去时Finally,wehadtogiveupourideatoholdapicnicoutsideasitrainedforawholeafternoon.,haveto（考点）,Musttheydo?Yes,theymust.No,theyneednt/donthaveto.,must&haveto,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.Shesaid,“Wehadtogeteverythingreadythatnight.”,比较must&haveto,NeedIdo?Yes,youmust.No,youneednt.,dare&need,注意对need问句的回答:-NeedIfinishtheworktoday?-Yes,_.No,_.No,_.,youmust,youneednt,youdonthaveto,neednt对其它情态动词的回答:-ShallItellJohnaboutit?-No,you_.-No,you_.,-Mustwedoitnow?-No,you_.-No,you_.,neednt,donthaveto,neednt,donthaveto,Ithoughtyou_likesomethingtoread,soIhavebroughtsomebooks.A.mayB.mightC.wouldD.must,单选,2.Whereismypen?I_it.A.mightloseB.wouldhavelostC.shouldhavelostD.musthavelost,3.Ididnthearthephone.I_asleep.A.mustbeB.musthavebeenC.shouldbeD.shouldhavebeen,4.-IsJohncomingbytrain?-Heshould,buthe_not.Helikesdrivinghiscar.A.mustB.canC.needD.may,5.Ithasbeenannouncedthatcandidates(候选人)_remainintheirseatsuntilallthepapershavebeencollected.A.canB.will