can could etc

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1、CanCanisanauxiliaryverb,amodalauxiliaryverb.Weusecanto:·talkaboutpossibilityandability·makerequests·askfororgivepermissionStructureofCansubject+can+mainverbThemainverbisalwaysthebareinfinitive(infinitivewithout"to").subjectauxiliaryverbmainverb +Icanplaytennis.-Hecannotplaytennis.can't?Canyoup

2、laytennis?Noticethat:·Canisinvariable.Thereisonlyoneformofcan.·Themainverbisalwaysthebareinfinitive.UseofCancan:PossibilityandAbilityWeusecantotalkaboutwhatispossible,whatweareableorfreetodo:·Shecandriveacar.·JohncanspeakSpanish.·Icannothearyou.(Ican'thearyou.)·Canyouhearme?Normally,weusecanfo

3、rthepresent.Butitispossibletousecanwhenwemakepresentdecisionsaboutfutureability.A.Canyouhelpmewithmyhomework?(present)B.Sorry.I'mbusytoday.ButIcanhelpyoutomorrow.(future)can:RequestsandOrders7Weoftenusecaninaquestiontoasksomebodytodosomething.Thisisnotarealquestion-wedonotreallywanttoknowifthe

4、personisabletodosomething,wewantthemtodoit!Theuseofcaninthiswayisinformal(mainlybetweenfriendsandfamily):·Canyoumakeacupofcoffee,please.·CanyouputtheTVon.·Canyoucomehereaminute.·Canyoubequiet!can:PermissionWesometimesusecantoaskorgivepermissionforsomething:A.CanIsmokeinthisroom?B.Youcan'tsmoke

5、here,butyoucansmokeinthegarden.(Notethatwealsousecould,may,mightforpermission.Theuseofcanforpermissionisinformal.)7COULDCouldisanauxiliaryverb,amodalauxiliaryverb.Weusecouldto:·talkaboutpastpossibilityorability·makerequestsStructureofCouldsubject+could+mainverbThemainverbisalwaysthebareinfinit

6、ive(infinitivewithout"to"). subjectauxiliaryverbmainverb+Mygrandmothercouldswim.-Shecouldnotwalk.couldn't?Couldyourgrandmotherswim?Noticethat:·Couldisinvariable.Thereisonlyoneformofcould.·Themainverbisalwaysthebareinfinitive.UseofCouldcould:PastPossibilityorAbilityWeusecouldtotalkaboutwhatwasp

7、ossibleinthepast,whatwewereableorfreetodo:·IcouldswimwhenIwas5yearsold.·Mygrandmothercouldspeaksevenlanguages.·Whenwearrivedhome,wecouldnotopenthedoor.(...couldn'topenthedoor.)·Couldyouunderstandwhathewassaying?7Weusecould(positive)andc