高中英语语法情态动词.ppt

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1、情态动词情态动词本身有实际词义，但不能单独作谓语，只能和后面的动词原形一起构成谓语。Wecanbethereontimetomorrow.我们明天能按时去那儿。Youmustobeytheschoolrules.你必须遵守校规。情态动词的定义情态动词无人称和数的变化，情态动词后加动词原形，否定式是在情态动词后面直接加“not”。个别情态动词有过去式，但此过去式时态性不强，可用于表示过去，现在或将来，也可用来表达委婉的语气。情态动词的特点1表能力cancouldbeabletoIamsostrongthatIca

2、nliftthisstone.HesaidthatJackcouldn’tfinishhisworkinsuchashorttime.Heisonlyfour,butheisabletoread.Shewasabletodoitwithoutmyhelp.Willyoubeabletocometomypartytomorrow?can表能力,但不一定能干成；beableto表经过一番努力设法干成了,可用于各种时态。=managetodo/succeedindoingYoucangonow.MayIknowyourn

3、ame?2表许可can,maycould/might也表许可，常用于问句中，表委婉—CouldIborrowyourdictionary?—Yes,ofcourseyou_______.A.mightB.willC.canD.shouldC3表必须Imustgonow.Sinceitisraining,wehavetostayindoors.must表主观必须，没有过去式haveto表客观必须关于must疑问句的回答---MustIcomebefore9pm?---Yes,you__________.---No,y

4、ou__________/____________.mustneedn’tdon’thaveto4表推测mustmaymight用于肯定句中Theremustbeamistake.Youmaywalktenmileswithoutseeingahouse.Hemightgetthereontime.用于否定句中表推测can’t,couldn’tmaynot,mightnotShecan’tbeserious.Wecouldn’tdobetter.Shemaynotbeserious.Sheisafraidtheym

5、ightnotliketheidea.用于疑问句中表推测cancouldmay/might不用于疑问句中表推测mustbe/can’tdo/mightbedoing都表对现在的推测musthavedone/can’thavedone/mighthavedone表对过去的推测It’s6:00.Mother_______(wait)formeoutside.—Helookssad.He_________(know)thenews.—No,he__________________it.mustbewaitingmusth

6、aveknowncan’thaveknownWemustn’twasteourtime.mustn’t5表禁止译为“一定不要…/千万别…”should/oughtto6表应该Asateacher,I________bestrictwithmystudents.should/oughttoshould的另一特殊用法，译为“竟然”Youcan’timaginethatawell-behavedgentlemen___besorudetoalady.A.mightB.needC.shouldD.wouldshould也可

7、表示推测—WhencanIcomeforthephotos?Ineedthemtomorrowafternoon.—They___bereadyby12:00.A.canB.shouldC.mightD.need7表事与愿违should/oughttohavedone本来应该做却没有做shouldn’t/oughtn’ttohavedone本不应该做却做了couldhavedonesth.本来可以做某事却没有做couldn’thavedonesth.不可能已经做了某事needn’thavedonesth

8、.本没有必要做某事却做了don’tneedtodosth不必做某事实际上没有做don’thavetodosth不必做某事实际上没有做---Sorry，Ihaven’tfinishedmyhomework.---Butyou________.oughtto/shouldhave改错：Heneedn’ttocome.Hedaresnotgo.dare1.He