八年級英語

Unit2HomeSweetHome（語法專練）情態(tài)動詞can&could掌握can和could的基本用法能夠正確回答請求和許可的問句0102學(xué)會用can/could禮貌地提出請求03學(xué)會用can/could征求許可04學(xué)習(xí)目標(biāo)Could

youpleasesweepthefloor?CouldIhangoutwithmyfriendsafterlunch?CanIputsomeflowersonthetable?Canyouhelpmehangupthephotos?觀察與思考1.這些句子都在表達(dá)什么？2.can和could有什么區(qū)別？Couldyouplease…CouldI…Canyou…CanI…請求許可基本句型：Canyou+動詞原形...?Couldyou+動詞原形...?基本句型：CanI+動詞原形...?CouldI+動詞原形...?1.表示能力IcanspeakEnglish.Shecanplaythepiano.2.表示許可Youcanusemypen.CanIgoouttonight?3.表示請求Canyouhelpme?CanIhavesomewater?can的三種核心用法1.表示過去的能力WhenIwasfive,Icouldread.Hecouldswimwhenhewassix.2.表示禮貌的請求Couldyouopenthewindow?CouldIuseyourphone?3.表示建議Wecouldgotothecinema.Youcouldaskyourteacher.could的基本用法canvscould的區(qū)別用法Can(現(xiàn)在/非正式)Could(過去/禮貌)一句話說明能力?現(xiàn)在有能力

I

can

swim.?過去有能力

I

could

swim.談能力，現(xiàn)在用can，過去用could。請求?非正式請求

Can

youhelpme??

更禮貌的請求

Could

youhelpme?想客氣，就把

can換成could。許可?

給予或征求許可

You

can

go.

Can

Igo??

只用于征求許可

Could

Igo?關(guān)鍵點：問句可以用Could，但答句給許可時，要用Can（如：Yes,you

can.)可能性?理論上的可能

It

can

becold.?推測的可能

It

could

rain.Could

的語氣更不確定。記憶口訣：現(xiàn)在用can，過去用could請求許可都可以，could更加有禮貌回答肯定回答（同意請求/給予許可）回答方式語氣例句Sure.

/

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

-B:

Sure.Certainly.比較正式-A:Couldyouhelpme?

-B:

Certainly.Yes,youcan.明確給予許可-A:CouldIopenthewindow?

-B:

Yes,youcan.Noproblem.非常隨意、友好-A:Canyoupassmethesalt?

-B:

Noproblem.Goahead.專門用于表示許可-A:CanIaskaquestion?

-B:

Goahead.

(問吧)回答否定回答（拒絕請求/不允許）回答方式語氣例句Sorry,I'mafraidnot.最禮貌、委婉-A:CouldIleaveearly?

-B:

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

-B:

No,youcan't.I'msorry,but...禮貌并給出理由-A:Couldyoudrivemehome?

-B:

I'msorry,butIhavetoworklate.實戰(zhàn)練習(xí)-基礎(chǔ)鞏固02一、單項選擇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、完成對話

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、情景應(yīng)答

根據(jù)問題寫出最恰當(dāng)?shù)幕卮稹: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、改錯題

找出每句話中的錯誤并改正。1.Couldyoutohelpmewiththisheavybox?→_________________________2.IcanfinishedmyhomeworkwhenIwaseight.→_________________________3.—CouldIuseyourcomputer?—Yes,youcould.→_________________________4.CanhespeaksFrench?→_________________________5.Youcantryingagainlater.→_________________________tohelp→help(情態(tài)動詞后接動詞原形)canfinished→couldfinish(過去能力，后接動詞原形)Yes,youcould.→Yes,youcan./Sure.(應(yīng)答一致性)speaks→speak(情態(tài)動詞后接動詞原形)trying→try(情態(tài)動詞后接動詞原形)六、書面表達(dá)

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