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1、情态动词情态动词有:can(could),may(might),shall(should),will(would),must,haveto,need,dare(dared),oughtto,usedto.情态动词无人称和数的变化,不能独立使用,它与其后面的动词原形合成谓语。情态动词的具体用法如下:1can1)表示能力能,能够Acomputercannotthinkforitself,itmustbetoldwhattodo.2)表示可能(理论上或是逻辑判断上)。Thetemperaturecanfallto–60℃,thatis60℃belowfreezing.气温可降至—60℃,
2、也就是零下60℃。Hecan’t(couldn’t)haveenoughmoneyforanewcar.他不可能有足够的钱买新车。3)表示惊异、怀疑、不相信的态度。(主要用在否定句、疑问句或惊叹句中)“是否有可能”______itbetruethatyourbikewasstolenagain?(Isitpossible…?)How_____youbesocareless!_______anyonebesuchafoolastobelievethat?4)用来表示一种可能出现的事情,或表示某事、某物、某人偶然或通常有做出什么事的倾向。通常(但并非总是)指不愉快的事情。或表示某些特殊
3、情况下的可能性,客观的可能性Ourhouseisonthetopofahill,andinwinterthewinds______beprettycold.TheWorldWideWebisjokinglycalledtheWorldWideWait,forsometimesitcanbeveryslow.Itcanbeverycoldinthemountains.Accidentscanhappenonsuchrainydays.Iwouldrathergoshoppingalonethangowithherbecauseshecanberathertiresomeattimes
4、.比较:Drivingontheseroads_____beaverynerve-rackingbusiness.Drivingonthisicyroad_____bedangeroustoday.5)比较委婉客气地提出问题或陈述看法。Can(Could)youlendmeahand?帮我一把好吗?I’mafraidwecouldn’tgiveyouananswertoday.恐怕我们今天不能给你答复。6)can表示能力时,还可用beableto代替。如:Icould/wasabletoplaychesswhenIwassix.但beableto可用于各种时态I'llnotbeab
5、letocomethisafternoon.Ihavebeenabletodothework.Ihopetobeabletodothework.区别:Somethingwaswrongwithmycar,butI________driveittothegarage.=Somethingwaswrongwithmycar,butI________driveittothegarage.=Somethingwaswrongwithmycar,butI________driveittothegarage.beableto可以表示经过努力或克服了困难之后做成了某事,相当于managetodo
6、,succeedindoing7)表推测can’thavedone表示对过去发生的事情的否定推测Shecan’tbeathomenow,forthelightsareallout.Itcan’thaverainedlastnight,forthegroundisdry.8)can的习惯用法Itisasgoodascanbe.不能再好了。Onecannotbetoocarefultodriveacar./indrivingacar.Onecannotbutbemovedbyhisnobledeeds.人们不能不为他那高尚的行为所感动。can’t/couldn’thelpdoingca
7、n’t/couldn’thelptodo2.could1)can的过去式IcouldspeakalittleJapanesewhenIwasatcollegebutnowIhaveforgottenallofthemexceptafewwords.2)客气的请求CouldIborrowyourdictionary?Yes/Ofcourse,youcan.3)could用在肯定句中表示一种比较婉转的怀疑。Hisstory_______betrue,butIhardlyt