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1、情态动词canmaymustneed(能)(可以)(需要)(必须)FromJasmineKan情态动词情态动词后面+动词原形情态动词没有人称和数的变化canIcannotplaybasketball.Ineedbuy/boughtacomputer.(能)need(需要)Shecan/cansrideahorse.Amyneed/needsbuyabook.------------否定式构成是在情态动词后面加"not"Icanplay/playedbasketball.---can(能)用法:①表示能力:He
2、canspeakalittleEnglish.Canyoufly?③表示请求或允许:CanIhelpyou?②表示猜测:ThatcannotbeourEnglishteacher,becauseshehasgonetoShanghai.could也可表示请求，语气委婉，主要用于疑问句，不可用于肯定句，答语应用canCouldIcometoseeyoutomorrow?Yes,youcan.（否定答语可用No,I'mafraidnot.）注意用法:①表示请求或允许:MayIgohome，please?(1)以m
3、ay（表许可或请求）开头的一般疑问句,肯定回答用may，否定回答用mustn't或can't.(2)在疑问句中不用于第二人称②表示可能性:Youmayberight.No,you_________may(可以)Yes,youmay.注意might为may的过去式，但也可以代替may，语气较为婉转客气或更加不肯定。Youmightberight.mightmustn’t/youcan’t.试比较:●Youmaynotsmokehere．(不可以)语气轻●Youcan’tsmokehere．（不能）重●Youmu
4、stn’tsmokehere．（决不可）最重can'tmaynotmustn't用法:既可以做情态动词,也可以做实意动词②实意动词(needtodosth):①情态动词(needdosth):Ineedbuyabighouse.need(需要)Heneeddrivemehome.DoIneedtobuyabighouse?Heneedstobuyabighouse.NeedIbuyabighouse?--Yes,youmust.--No,youneedn’t/don’thaveto.(不必要)--Yes,yo
5、udo.--No,youdon’t.用法:②表示推测“肯定，一定”:①表示义务、必要或命令:Youmustcomeearlytomorrow．---MustIfinishmyhomeworkfirst?Theymustbeathome.Thelightison.---Yes,youmust.---No,youdon'thaveto/needn't.must(必须)注意must开头的疑问句，其否定回答通常用don‘thaveto或needn’t。而不用mustn'tmustn't(禁止)③否定时表示“禁止”:Y
6、oumustn’tsmokehere.用法:It’seleveno’clock.Ihavetogonow.Itwasgettingdark.Hehadtofinishtheworkfirst.Idon’thavetogonow.Hedoesn’thavetofinishtheworkfirst.haveto(必须)注意haveto表示客观因素Weareverygladattheparty,butit’s11,sowehavetoleavenow.must表示主观因素Wemuststudyhardtofinda
7、goodjobforourselves.must(必须)haveto,must区别Mybrotherwasveryill,soIcallthedoctorinthemiddleofthenight.Hesaidthattheyworkhard.Youdon'thavetotellhimaboutit.Youmustn'ttellhimaboutit.你不一定要把此事告诉他。你一定不要把这件事告诉他.havetomusthadtomust区别CanI…?Yes,youcan.No,youcan’t.MayI…?
8、Yes,youmay.No,youcan’t/mustn’t.NeedI…?Yes,youmust.No,youneedn’t.DoIneedto…?Yes,youdo.No,youdon’t.MustI…?Yes,youmust.No,youneedn’t.------------找伙伴Exercises1.Mustwecleanthehousenow?No,you________.needn't
