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1、canandcouldmayandmightwillandwouldshallandshouldmustandcan’t情态动词用法ks5u精品课件CanCouldks5u精品课件Sohecancarryheavybooks.Hecouldn'topenthedoorbyhimself.Couldyouopenthedoor,please?abilityabilityrequestks5u精品课件1)表示能力(ability),指有能力做某事,意为“能够”。例如:注意:表示现在,将来“能够”可用beableto替换。表示过去“能够
2、”并成功了只能用was/wereableto,不能用could。例如Mygrandmaisovereighty,butshecan/isabletoreadwithoutglasses.Wecan/willbeabletotalkaboutthematterlater.Italkedwithherforalongtime,andatlastIwasabletomakeherbelieveme.(不能用could)can和could:ks5u精品课件2)表示请求(request)或许可(permission)。意为“可否”、“可以”
3、。Could比can更有礼貌,在此不是can的过去式。Canyouwaitamomentplease?Liz,canyoudomeafavor?Excuseme,couldyoutellmethewaytothestation?Iwonderifyoucouldhelpme.(request)ks5u精品课件----CouldIuseyourphone?----Yes,ofcourse.Youcan.DoyouthinkIcouldborrowyourbike?(permission)3)表示可能性(possibility)a.c
4、an表示泛指的“可能”,并非说话者主观认为的可能性,即并非说话者的主观猜测。Accidentcanhappentoanydrunkendriver.ks5u精品课件b.表示说话者主观猜测,只能用与否定句或疑问句中。例如:Itcan’tbemyfather.HeisnowinEngland.----Canitraintomorrow?----No,itcan’t.ks5u精品课件maymightks5u精品课件Hemaybeinhisoffice.=(perhapsheisinhisoffice.)Hemightbehavingl
5、unch.=(perhapsheishavinglunch.)ks5u精品课件may和might:1)表示可能性(possibility),用于对现在,过去或将来的推测,暗示不确定。might不是may的过去式,它所表示的可能性比may小,含较多的怀疑。Hemaybeverybusynow.(可能性较大)Hemightbeverybusynow.(可能性较小)ks5u精品课件2)表示许可(permission),表示允许别人做某事,也可征求对方的许可。Hemaygonow.Wemaykeepthebookfortwoweeks.
6、3)用于祈使句,表示祝愿。Mayyousucceed!Mayyouhaveanicetrip!ks5u精品课件will和would:1)表示意愿表示愿意做或主动提出做,如意志,愿望或决心Thatbaglooksheavy,I’llhelpyouwithit.(offeringtodosth)----YouknowthatbookIlentyou.CanIhaveitbackifyou’vefinishedwithit?----Ofcourse.I’llgiveittoyouthisafternoon.(agreement)Tha
7、nksforlendingmethemoney,I’llpayyoubackonFriday.(promise)ks5u精品课件2)表示习惯(habit,custom)Thisoldmanisstrange.Hewillsitforhourswithoutsayinganything.WewouldsitaroundGrandpaaftersupper,listeningtohisstories.3)表示请求(request),用于第二人称,would比will更委婉。例如:Willyoucomethisway,please?Wo
8、uldyouopenthewindow?ks5u精品课件shall和should:1)shall的用法a.shall在疑问句中用于第一,第三人称,表示征求对方的意见。Shallweputoffthesportsmeetinguntilnextmon