情态动词复习一．概念：本身有一定的词义，表示说话人的情绪、态度或语气的动词。二.特点：1.不能单独作谓语，和其他动词原形构成谓语。2.无人称和数的变化。3.否定式构成是在情态动词后面加“not”。4.个别情态动词过去式，过去式可以用来表达更加客气、委婉的语气三．基本用法：1.can,could1)表示能力时，等于beableto。Canyouliftthisheavybox?=Areyouabletoliftthisheavybox?（体力）区别：①can只有一般现在时和一般过去式（could）；而beableto则有更多的时态(wasableto;willbeableto;have/hasbeenableto)②而表示过去通过努力而做成某事，只能用beableto，不能用can。Hewasabletogotothepartyyesterdayeveninginspiteoftheheavyrain.2)can表示请求和允许。此时可与may互换，-----Can/MayIgonow?-----Yes,youcan./No,youcan’t.3)can表示“有时会”：Akindpersoncanlosetempersometimes.脾气好的人有时会发脾气。4）can可表推测，只能用于否定句和疑问句5）can还用于一些固定短语中，如can’thelpdoing译为_________________________can’tbutdo译为_________________________can’t…too…/enough译为_________________________巩固练习：()1.Justbepatient.You_____________expecttheworldtochangesosoon.A.can’tB.needn’tC.maynotD.willnot()2.Thefirespreadthroughthehotelveryquicklybuteveryone__________getout.A.hadtoB.wouldC.couldD.wasableto()3．I’mgoingtoEuropeonvacationtogetherwithJohnifI___findthemoney.A.canB.mightC.wouldD.need()4.Thepolicestillhaven’tfoundthelostchild,butthey’redoingallthey______..A.canB.mayC.mustD.should()5．Someaspectsofapilot’sjob________beboring,andpilotsoften_______workatinconvenienthours.A.can;havetoB.may;canC.haveto;mayD.oughtto;must()6．Thebiggestproblemformostplants,which______justgetupandrunawaywhenthreatened,isthatanimalsliketoeatthem.A.shan’tB.can’tC.needn’tD.mustn’t()7.----I’vetakensomeoneelse’sredsweaterbymistake.----It________Harry’s.Hehateswearingred,becausehethinksit’stoobright.A.hastobeB.willbeC.mustn’tbeD.can’tbe()8.----Look,someoneiscoming.Guess_______.-----Jack.He’salwaysontime.A.whocanitbeB.whohemayC.whohecanbeD.whoitcanbe()9.---IsawMaryinthelibraryyesterday.----You_____her.Sheisstillabroad.A.mustn’tseeB.can’thaveseenC.mustn’thaveseenD.couldn’tsee1()10.ItisusuallywarminmyhometowninMarchbutit____berathercoldsometimes.A.mustB.canC.shouldD.would()11.MyMP4playerisn’tinmybag.Where_____Ihaveputit?A.canB.mustC.shouldD.would二、may,might1)表示请求和允许。might比may语气更委婉，----May/MightItakethisbookoutoftheroom?----Yes,youcan.(No,youcan’t/mustn’t.)2）表示可能性Hemay/mightbeverybusynow.3）用于祈使句，表示祝愿。（May+主语+动词原形）Mayyousucceed!4)mightaswell表“不妨,何妨，还是…的好”Todayyoumightaswellgotoschool,oryourteacherwillcriticizeyou.(译)：_______________________________________________________________________________________巩固练习：()1.—Itakethebookout?—I'mafraidnot.A.WillB.MayC.MustD.Need()2.He_______joinusinthehiking,butI’mnotsure.A.mayB.canC.mustD.shall三、must,haveto，need1)must是说话人的主观看法，而haveto则强调客观需要。must只有一般现在时，haveto有更多的时态形式。don’thaveto=needn’t表示“必须”；否定形式mustn’t，表示“禁止”。Youmustcomeintime.Youmustn’ttellanyoneaboutthis——it’sasecret.---MustIbehomebeforeeighto’clock?---Yes,youmust./No,youneedn’t./No,youdon’thaveto.2)must表推测。只能用于肯定句中（一般不对将来的情况进行推测）Hemustbeill.Helookspale.（对现在推测）Johnmustbereadinginhisroom.Thelightison.（对正在进行的事情推测）TheymusthaveearnedalotofmoneywhentheywereinG...
