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情态动词是一种本身有一定的词义,表示说话人的情绪,态度或语气的动词,但不能单独作谓语,只能和其他动词原形构成谓语。情态动词无人称和数的变化,情态动词后面跟的动词需用原形,否定式构成是在情态动词后面加not。1、WhataretheModalVerbs?cancouldmaymightshallshouldoughttomustwillwoulddareneed2.Howmanymodalverbsdoyouthinkof?3、Whatarethefunctionsofmodalverbs?Weusemodalverbstotalkabout:•Ability（能力）•Obligation（义务）•Certainty（可能性）•Permission（允许）Wealsousemodalverbsto:•Makerequests（提出请求）•Makesuggestions（提建议）•Makeoffers（提供帮助）•Giveadvice（提出意见）1.Ability(能力):LiuXiang___runthe110mhurdleracewithin13seconds.cancan/could:1.can一般表示与生俱来的能力或者一种客观可能性,还可以表示请求和允许。LearningEnglish_____bedifficult.canMancannotlivewithoutair.can/could:2.在疑问句中，用could可表示请求，语气较委婉。—____youlendmesomemoney?—Sure.CouldHeasksifhe____smokehere.couldcan/could: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）He’ssuchanicepersonthathe______committhecrime.can’t你怎么会如此地粗心！Howcanyoubesocareless!Canthisbetrue?can/could:4.cannot……too表示“无论怎样…也不过分”，“越…越好”。You____be____carefulwhilecrossingtheroad.can’ttoocan/beableto区别:Edisonalwayswonderedwhyhenscouldhatch(孵)chickenswhilehewasnotableto.Question:Arethetwomodalverbsinterchangeable(互换)?Ifnot,why?canmeansthatapersonhasacertainabilitytodosth.beableto=managetodosth。相同点：两者都可以表示“能力”can/beableto区别:1.AbigfirebrokeoutinABChotelyesterday.Luckily,everyone__________runoutofthebuilding.wasableto2.Ifyoufeellikeit,you___goforawalkinthepark.canI’msotired!Ihavetodothetrainingforatleast10hoursaday!2.Obligation(义务):…yet,He____workhardtowinthegoldmedal.AlthoughLiuXiangissogiftedinhurdlerace…must语气逐渐加强oughtto/shouldhavetomustYoumotherbringsyouupandtakesgoodcareofyou,sowhensheisold,you___lookafterherinreturn.A.canB.mayC.havetoD.mustShiDongpeng_____winamedalattheOlympicgames.Althoughthechanceofwinningamedalissmall,I’lltrymybest!3.Certainty(可能性):mightveryuncertainalmostcertainmightshouldmustmaycouldoughttowill1.He_____beathome.2.He_____beathome,forhejustcalledmefromhishome15secondsago.A.mayB.mightC.mustA.mayB.mightC.must—They___bedoingtheexperimentinthelab.—Why？—Becausethelightsarestillburning.A.couldB.canC.mustD.would4.Permission(允许):_____IeatKFCifIwinthegoldmedal?Maymay/might:1.表示许可。表示请求、允许时，might比may的语气更委婉一些。—Might/MayIuseyourcomputer?—Yes,you___.—No,you___.cancan’tmay/might:2.用于祈使句中表示祝愿。3.表示推测、可能（只用于肯定句，疑问句则要用can或could）。Hemaybeverybusynow.Mayyoubehappyallyourlife.Hecan’tbebusydoinghishomework,becauseIchatwithhimontheInternet.5.Makingrequests(提出要求):____youhelpmewithmytraining?Idon’tknowhowtousethisequipment!Can6.Makingsuggestions(提出建议):____wedothetraininginthemorning?It’stoohottotakeexerciseintheafternoon.Shallshall:1.Shall用于第一、第三人称疑问句中，表示说话人征求对方的意见、向对方请示或提供帮助。1.Shallwebeginourlesson?2.Whenshallhebeallowedtoleavehospital?3.ShallIcarrythisbagforyou?shall:2.Shall用于第二、第三人称，表示说话人给对方命令、警告、允诺或威胁。Youshallfailifyoudon‘tworkharder.Heshallbepunished.HeshallhavethebookwhenIfinishit.警告威胁允诺7.Makingoffers(提供帮助):Don’tworry,dear,I____washthemrightaway.Mom,mydirtyclotheshavebeenpiledup!Idon’thavetime……willwill/would:1.表示请求、建议等，would比will委婉客气。sentencepatternWouldyouplease…Wouldyoumind…Wouldrather…Wouldyoulike…will/would:2.表示意志、愿望和决心。Iwillneverdothatagain.will/would:3.可表示经常性、习惯性、倾向性。翻译为“经常、惯于、总是”。1.Theoldmanhaveasmokeunderabigtreeeveryafternoonafterhefinishedhisfarmwork.would4.门就是打不开!Thedoor_____open.won’twill/would:Iwillgototheparkwithyoutomorrowifyouwilloffermelunch.情态动词助动词8.Givingadvice(提出意见):You___________________eatsomuchbeforerunning.Howdelicious!!!shouldnot/oughtnottoshould:1.Should表示劝告、建议、命令，其同义词是oughtto；在疑问句中，通常用should代替ought…to。ShouldIopenthewindow?Iamreallysurprisedthatheshouldtalktohisparentsthatway.2.用在表建议,命令,要求等动词后的虚拟语气中。MyfriendssuggestedthatI(should)payvisittoshanghainextmonth.3.表示惊讶,忧虑,惋惜等感情色彩。Youshouldhavestartedearlier.4.should+have+过去分词，表示应该做而实际上没有做到.Question:Howcanwedealwithexercisesconcerningmodalverbs?Functions&usageofmodalverbsThecontext(上下文、语境)Jackwantstosurftheinternetafterschool…Jack—Excuseme,_____(may/must)Iuseyourcomputerforawhile?Rose—Yes,you_____(should/can).ButitisnotconnectedtotheInternet,soifyouwanttocheckyoure-mail,youwon’tbeableto.Jack—Then,Iwill______(can/haveto)findanotherone,butthankyouanyway.maycanhavetoJackishavingaconversationwithhismom…Mom—Ifyou_____(can/must)finishyourhomeworktoday,you_____(shall/must)gotothecinemawithyourclassmatetomorrow.Jack—Ialwaysfinishmyhomeworkontime,buteverytimeyoubreakyourpromise.Mom—Butthistimewillbedifferent,Ipromise.Jack—Ok.I_____(will/need)trymybest.Ifitisnotsodifficult,it_____(can/must)befinishedbefore10pm.Ijusthopeyouwillkeepyourpromise.canshallwillcanDiscussionWhatcanweseniorschoolstudentsdoatschool?Whatcan’t/mustn’twedoatschool?Whatdowehavetodoatschool?What…?Discussandwritesomesentencesaboutthefollowingtopicsbyusingthemodalverbs.DiscussionWhatcanweseniorschoolstudentsdoatschool?Whatcan’t/mustn’twedoatschool?Whatdowehavetodoatschool?What…?Discussandwritesomesentencesaboutthefollowingtopicsbyusingthemodalverbs.Reviewtheusageofmodalverbsandfinishtheexercisepaper.