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1、中考英语所有考点分析十:情态动词%1.情态动词的用法1.can用法1)表示能力,与beableto同义,但can只用于现在时和过去时,beableto可用于各种时态。Twoeyescanseemorethanone.注:Canyou...?Yes,Ican/NoJcan't.2).表示允许、请求用could比can语气更加委婉客气,常用于couldI/you.....?句型中,若表示同意时,用can
2、口
3、答而不用could.CouldIborrowthebook?No,youcan't・3)o表示推测“可能"常用于否定句或疑问句中。(can't表示一定不是)Itcan
4、'tbetrue.Canitbetrue?2.may用法1)表允许,请求=can表示许可或征求对方的许可,常于第一人称连用。注:MayI....?Yes.youmayNo,youcan't/mustn't.在回答以may引起的问句时,多避免用这个词,而用其它方式,如Yes,please./Certainly.2)表推测,可能、也许。常用于肯定句中。Maybeheknowsthenews.=Hethenews.3.must1)表示义务。意为“必须”(主观意志)。Wemustdoeverythingstepbystep.注:MustI....?Yes,youmust/No
5、,youneedn't(don'thaveto).—Mustwehandinourexercise一booksnow?—No,youneedn't./No,youdon'thaveto.2)mustn't表禁止、不允许。Youmustn'ttalktoherlikethat.3)表示揣测。意为“想必、准是、一定''等,只用于肯定句。否定、疑问句4*must改为can.Hemustbeill.Helookssopale.She'swearingadiamondnecklace.Shemusthavealotofmoney.注:must表推测时,其反义疑问句与must后面
6、的动词一致。Theremustbesomethingwrong,?4.need的用法need既可用作情态动词,也可用作实义动词。用作情态动词时,主要否定句或疑问句中。用作实义动词时,可用于各种句式。1).用作情态动词,用于否定句和疑问句中。a).NeedI....?Yes,youmust/No,youneedn't.Needwefinishtheworktoday?Yesyou_?A.needB.canC.mayD.mustb).need+dosth.变否定句:needn'tdosth变疑问彳'J:Needsbdosth?2).用作实义动词a).need+todost
7、h.Weneed(buy)someschoolthings.变否定句:don't/doesn't/didn't+needtodosth.变疑问句:Do/Does/Didsb+needtosth?Yes,...do/does/didNo,sbdon't/doesn't/didn't・Youdon'tneedtodoityourself.b).当主语是物时。Sth+need+doingsth=Sth+needtobedone.Thetableneedspainting.=Thetableneeds.1.hadbetter的用法1).hadbetter+动词原形=It'sb
8、esttodosth.Youhadbetter(stay)athome.=stayathome.2).Hadbetternot+动词原形Wehadbetter(notplay)thecomputergames.2.must与haveto1).一般情况下,两者可互换。must=haveto2).must“必须,应该”表示说话人的主观看法,即说话人认为必须干某事。(内在原因)haveto-必须,不得不”强调客观需要,即外界因素迫使某人不得不干某事。(外界原因)Ican'tstopplayingthecomputergames.Foryourhealth,I'mafraid
9、you.A.canB.mayC.mustD.hadto%1.情态动词后跟完成式和进行式的用法1.情态动词后跟完成式,表“原本应该干某事,而实际上没干”Ishouldhavefinishedtheworkearlier.Heisn'there.Hemusthavemissedthetrain.2.情态动词后跟进行式,表示“想必正在......”,“可能正在......”,“应当正在”等意。It'stwelveo'clock.Theymustbehavinglunch.Theymaybediscussingthisproblem.Hecan'tbetel