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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℃，也就是零
2、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。或表示某些特殊情况下的可能性,
3、客观的可能性Ourhouseisonthetopofahill,andinwinterthewinds______beprettycold.TheWorldWideWebisjokinglycalledtheWorldWideWait,forsometimesitcanbeveryslow.Itcanbeverycoldinthemountains.Accidentscanhappenonsuchrainydays.Iwouldrathergoshoppingalonethangowithherbecauseshecanberathertiresomeattimes.比较：Drivingo
4、ntheseroads_____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'llnotbeabletocomethisafte
5、rnoon.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,succeedindoing7)表推测
6、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’thelpdoingcan’t/couldn’thelptodo2.co
7、uld1)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
