Summeriscoming.Abigsun…tellmesomewordsaboutit.hotsunnyholidayswimIce-creamskirtfireWhatshallwedoifafirehappens?Discussionmustormustn’t4.Taketheleft.乘电梯逃离。5.Jumpoutofthetallbuilding.跳楼.1.Usewetquiltorclothtoblockthedoor.用湿的被褥或衣服堵住门。2.Tomakeaquickdeparture,runaway.当机立断,迅速逃离。3.Call114.6.puttingitoutwithafire-extinguisher用灭火器灭火。7.Findsomeextrawaytogetthemselvesout.多掌握几条逃生路线。情态动词•情态动词有时又叫情态助动词。情态动词本身虽有一定词义,但不能独立用作谓语、也没有人称和数的变化,其后一定要跟随动词原形,共同构成复合谓语。MayI?MayIcomein?MayIuseyourpen?Hemusttakesomemedicine.Mustn’tswimMustn’ttouch常用的情态动词有哪些?•Can能,会-can’t不会•Could-couldn’t/beableto•May可能,或许-maynot•Might可能(更加委婉)-mightnot•Must必须-mustn’t•Haveto不得不-don’thaveto•Need需要-needn’tLet’sdoit…I()dance.I()gotoHarfordoneday.You()turnoffthelightwhenyouleavetheroom•1.Tommycandrivethecar•Robotcandomanythings.•2.Icouldsendcardsbeforehavingthecomputerlessons.(表示过去的一种能力)•CouldIsithere?(用于一般疑问句中,语气更加温婉)•3.beableto可用于各种时态之中•Iwillbeabletoliveonthemoon.•Shewasableto(could)finishthehomework.•IwasabletoDisneylastmonth.•IwasabletoswimacrosstheGanjiangriverlastsummer.(表示有能力做,并且成功了)•ShecouldflyovertheSouthPole.(不一定成功)1.can/could/beableto?•1.can能,会•2.could比can更为委婉的语气;表示过去曾有过的能力;•3.was(were)ableto与could的区别是表示不但有能力,而且成功的做了某事。Hemaybesick.(生病的可能性较大)—Hemightbesick.(生病的可能性较小)(2)may/mightMight比may更委婉注意:may引导的疑问句,肯定回答用:Yes,youmay.否定回答用:No,youmustn't.(No,youcan't或No,youhadbetternot.)表示“千万不要”,“不可以”,“禁止”的意思。•3.must,havetomust“一定,必须”;•haveto不得不”。•如果用于过去时或将来时,要用haveto来代替,但must可用于间接引语,表示过去的必要和义务。Youmuststopsmoking.你必须把烟戒掉。(强调主观意志)Ihavetostopthecarandwaitforthepoliceman.我不得不停车等那个警察。(强调客观)•Must提问否定回答只能用needn’t或者don’thavetoImuststudyhard.ihavetostudyhard.骂你没妈•Must提问-needn’t回答(don’thaveto)•May提问-mustn’t回答(can’t)•4.needA作为情态动词使用:need没有时态与人称的变化,并且多在否定句,疑问句和条件句中使用,含义为“需要,必须”。Youneednothandintheexercisetoday.你不必今天交作业。•Needwefindtimetogointothequestion?要不要我们找时间把这个问题深入研究一下?5、情态动词表示推测或判断的用法情态动词对现在和未来的推测对过去的推测使用场合mustmust+动词原形musthavedone肯定句may/mightmay/might+动词原形May/mighthavedone肯定句、否定句can/couldcan/coulddoCan/couldhavedone否定句、疑问名(could可用于肯定句)should用来表示一种估计的情况“按理会/估计会”shoulddo/beshouldhavedone肯定句、否定句、疑问句Itmusthaverainedlastnight.(对过去的猜测)•情态动词练习(1)•1.We__________forherbecauseshenevercame.A.needn’twaitB.shouldn’thavewaitedC.mustn’twaitD.mustn’thavewaited2.Janny__________havekeptherword.Iwonderwhyshechangedhermind.A.mustB.shouldC.needD.would3.It’snearlyseveno’clock.Jack__________behereatanymoment.A.mustB.needC.shouldD.can4.—WhencanIcomeforthephotos?Ineedthemtomorrowafternoon.—They__________bereadyby12:00.A.canB.shouldC.mightD.need5.Bequick!They________forusatthechurchgaterightnow.A.mustwaitB.musthavewaitedC.mustbewaitingD.oughttowait•6.should,wouldshould表示应该做某事或承担责任、义务;例如:Youshouldworkharderandpasstheexam.(表示应该)你应该更加努力,通过考试。•Hadbetter最好+V.原型•You’dbetterputonyourcoat.•否定形式:hadbetternot…最好不要…•You’dbetternoteatsomuchice-cream.