the 第三课时“Section4(CrammarFocus-4c)单元语法精讲精练一语法精讲情态动词表推测的用法情态动词must,can,may,could,might都可表推测。1.肯定推测(1)must用于肯定句中,表示对现在的情况进行较有把握的推测,意为“准是;一定“。其后接动词原形。eg:一Pvehadnosleepfor48hours.我已经48个小时没睡觉了。一Youmustbemuchtootired.你一定太累了。.E(2)may用在肯定句中,表示对现在的情况进行把握不太大的推测,意为“也许;可能“。eg:Donrtplaywiththeknife.Youmayhurtyour-self.不要玩小刀。你可能会弄伤自己。(3)could,might也可表示推测,常用在过去时的句子中;但在树些场合中,为了使语气更委婉,也可用could,might代替can,may。eg:Theysawsomethingintheskylastnight.Itcould/ymightbeaUFO.昨天晚上他们看见天空中有东西。它有可能是不明飞行物。Youmightycouldbeveryexcited.你可能很兴奋吧。.尺一/一2.否定推测表否定推测时,cant,couldnrt语气最强,指“不可能“。eg:Thestorysoundsreasonable,butitcan:tbetrue.这个故事听起来合情合理,但它不可能是真的。3.疑问句中的推测疑问句中表推测时,常用can或could,意为“可能“。eg:Whocanitbe?CanitbeJenny?那可能是谁呢?是珍妮吗?一4.对现在正在进行的动作的推测,用“情态动词+bedoing“表示。eg:Hemaybelisteningtotheradionow.他可能正在听收音机。语法精练一、根据句意,填入括号中所给单词的正确形式。1.Therearemanylaboratories(laboratory)inourschool,Andthelargestonewasbuiltlastyear.2.Ofthetyo“coats(coat),Mikewillchoosethethic-kerone.3.(2017,宿迁中考)Bobstayeduplatelastnightandnowhefeelssleepy(sleep).4.IheardJimsinging“(sing)whenIpassedbyhis一bedr00In。5.一Listen1IsthatLucyplayingtheviolinintheroom2一No,It_cant(can)beher,ShehasgonetoschoolL.二、句子改错。增加词时,在缺词处加A,并在其下面写出增加的词;删除词时,用划掉多余的词;修改词时,在错的词下画线,并在该词下面写出修改的词。1.(2017.成都中考)ThispairofglassescanrtbemustTonys,Hestheonlyonewhowearsglasses.2.Whenyouaretravelling,bringamapbecauseitmighthelpyou.may/can3.Atthe、first,Judywasnitusedtogoingtoworkbybus嫉匠4.ThatbluebackpackmustbelongtoLiYings:.LiYing5.一DoyouoftenseeDavidrunningontheplayground?Tun一No,butheisoftenseentoplaytennisinthepark.八