Unit2CanCould语法专练课件-人教版八年级英语上册

八年级英语

Unit2HomeSweetHome（语法专练）情态动词can&could掌握can和could的基本用法能够正确回答请求和许可的问句0102学会用can/could礼貌地提出请求03学会用can/could征求许可04学习目标Could

youpleasesweepthefloor?CouldIhangoutwithmyfriendsafterlunch?CanIputsomeflowersonthetable?Canyouhelpmehangupthephotos?观察与思考1.这些句子都在表达什么？2.can和could有什么区别？Couldyouplease…CouldI…Canyou…CanI…请求许可基本句型：Canyou+动词原形...?Couldyou+动词原形...?基本句型：CanI+动词原形...?CouldI+动词原形...?1.表示能力IcanspeakEnglish.Shecanplaythepiano.2.表示许可Youcanusemypen.CanIgoouttonight?3.表示请求Canyouhelpme?CanIhavesomewater?can的三种核心用法1.表示过去的能力WhenIwasfive,Icouldread.Hecouldswimwhenhewassix.2.表示礼貌的请求Couldyouopenthewindow?CouldIuseyourphone?3.表示建议Wecouldgotothecinema.Youcouldaskyourteacher.could的基本用法canvscould的区别用法Can(现在/非正式)Could(过去/礼貌)一句话说明能力✅现在有能力

I

can

swim.✅过去有能力

I

could

swim.谈能力，现在用can，过去用could。请求✅非正式请求

Can

youhelpme?✅

更礼貌的请求

Could

youhelpme?想客气，就把

can换成could。许可✅

给予或征求许可

You

can

go.

Can

Igo?✅

只用于征求许可

Could

Igo?关键点：问句可以用Could，但答句给许可时，要用Can（如：Yes,you

can.)可能性✅理论上的可能

It

can

becold.✅推测的可能

It

could

rain.Could

的语气更不确定。记忆口诀：现在用can，过去用could请求许可都可以，could更加有礼貌回答肯定回答（同意请求/给予许可）回答方式语气例句Sure.

/

Ofcourse.最常用、最自然-A:Can/CouldIuseyourpen?

-B:

Sure.Certainly.比较正式-A:Couldyouhelpme?

-B:

Certainly.Yes,youcan.明确给予许可-A:CouldIopenthewindow?

-B:

Yes,youcan.Noproblem.非常随意、友好-A:Canyoupassmethesalt?

-B:

Noproblem.Goahead.专门用于表示许可-A:CanIaskaquestion?

-B:

Goahead.

(问吧)回答否定回答（拒绝请求/不允许）回答方式语气例句Sorry,I'mafraidnot.最礼貌、委婉-A:CouldIleaveearly?

-B:

Sorry,I'mafraidnot.No,youcan't.直接、明确-A:CanIplaygames?

-B:

No,youcan't.I'msorry,but...礼貌并给出理由-A:Couldyoudrivemehome?

-B:

I'msorry,butIhavetoworklate.实战练习-基础巩固02一、单项选择1.—______youpassmethemenu,please?—Ofcourse.Hereyouare.A.CouldB.MayC.ShouldD.Would2.WhenIwasseven,I______swim,butI______now.A.can;couldn'tB.could;canC.can't;couldD.could;can't3.—CouldIborrowyourdictionary?—Yes,______.A.youcouldB.youcanC.youdoD.youare4.Youlooktired.You______takearest.A.couldB.canC.mayD.must5.—CanItrythisshirton?—______Thefittingroomisoverthere.A.No,youcan't.B.Yes,youcould.C.Sure,goahead.D.I'mafraidnot.ABBAC二、用can,could,can't,couldn't填空

I'msorry,I______helpyourightnow.I'mtoobusy.______youplaythepianowhenyouwerefive?It'sveryloudinhere.______youpleasespeakalittlelouder?He______cometothephonebecausehewasintheshower.______Iaskyouaquestionaboutthehomework?We______seetheoceanfromourhotelwindow.Theviewwasamazing!You______usemycalculatorifyouneedto.I______findmykeysthismorning.Haveyouseenthem?______youtellmehowtogettothepostoffice?She______speakthreelanguages:English,French,andChinese.can'tCouldCan/Couldcouldn'tCan/Couldcouldcancouldn'tCan/Couldcan三、完成对话

Dialogue1:AtHomeA:Mom,(1)______IgotothelibrarywithLisathisafternoon?B:(2)______,butyouneedtofinishyourhomeworkfirst.A:I'vealreadyfinishedit.B:Okay.(3)______youbebackbeforedinner?A:Yes,we(4)______.Dialogue2:IntheClassroomA:Idon'tunderstandthismathproblem.(5)______youhelpme?B:Sorry,I(6)______.I'mnotgoodatmatheither.Butyou(7)______askMr.Wang.A:That'sagoodidea.(8)______Iuseyourpentowritedownthequestion?B:Sure.Hereyouare.can/CouldSure/OfcourseCancanCan/Couldcan'tcouldCan/Could四、情景应答

根据问题写出最恰当的回答。Q:Couldyoushowmewherethesciencelabis?A:_________________________Q:CanIturnontheairconditioner?A:(Givepermissionpolitely)_________________________Q:CouldIhandinmyessaytomorrow?A:(Refusepolitelyandgiveareason)_________________________Q:Canyoulendme20dollars?A:(Refusepolitely)_________________________Q:Couldyoutakeaphotoforus?A:(Agreehappily)_________________________Sure,it'sjustdownthishallontheleft.Yes,ofcourse./Goahead.I'msorry,butIneedtocollectallessaystoday.I'mafraidIcan'trightnow.Certainly!Smile!五、改错题

找出每句话中的错误并改正。1.Couldyoutohelpmewiththisheavybox?→_________________________2.IcanfinishedmyhomeworkwhenIwaseight.→_________________________3.—CouldIuseyourcomputer?—Yes,youcould.→_________________________4.CanhespeaksFrench?→_________________________5.Youcantryingagainlater.→_________________________tohelp→help(情态动词后接动词原形)canfinished→couldfinish(过去能力，后接动词原形)Yes,youcould.→Yes,youcan./Sure.(应答一致性)speaks→speak(情态动词后接动词原形)trying→try(情态动词后接动词原形)六、书面表达

假设你正在筹备一个班级派对，你需要就以下三件事与你的朋友/同学沟通。请编写三段简短的对话，必