高一英语课件下学期Unit15Grammer高一英语课件

Unit15Grammer:ModalVerbs(3)KeytosomeexercisesModalVerbs(3):Whenyouareverysureofsomething,youusemustinpositivesentencesandcannotorcan’tinnegativesentences.e.g.YoumustbeJeanne.I’mMathildeLoisel.Weusedtoknoweachotherverywell.Itcan’tbetrue!Idon’tbelieveit.Whenyouarequitesureaboutsomething,youusecan.e.g.Attendingaballcanbeexciting.Whenyouthinkthatsomethingispossible,butyouarenotverysure,youusecould,mayormight.(could,mightherearen’tpastform)e.g.YoucouldborrowsomejewelleryfromyourfriendJeanne,whoismarriedtoarichman.YoumaynotknowthatthenecklaceIreturnedisnottheonethatIhadborrowed.Don’tyouhaveafriendwhomightlendyousomejewellery?Must,can/could,may/might的用法must1.Must表示推测时，只能用于肯定句。2.Must+bedoing/do表示对现在的动作进行肯定推测3.Must+havedone表示对过去发生的事情作出的肯定判断Must,can/could,may/might的用法must1.Must表示推测时，只能用于肯定句。这台电脑肯定出了问题。Theremustbesomethingwrongwiththecomputer.你努力学了一整天，一定累了吧.Youhaveworkedhardallday.Youmustbetired.2.Must+bedoing/do表示对现在的动作进行肯定推测他现在一定在看小说.Hemustbereadingnovelsnow.他们买了一套新房子。他们一定很有钱.Theyhaveboughtanewhouse.Theymusthavealotofmoney.3.Must+havedone表示对过去发生的事情作出的肯定判断他们在打篮球，他们一定做完了作业。Theyareplayingbasketball,theymusthavefinishedtheirhomework.路是湿的,昨天晚上一定下雨了。Theroadiswet.Itmusthaverainedlastnight.can/could1.Can/could表示推测时，只能用在否定句或疑问句中。这么晚了，汤姆还在看书吗？It’ssolate.CanTombereading?这个人不可能是玛丽，她生病了。Itcan’tbeMary.Shehasfallenill.她不可能在说谎。Shecouldn’tbetellinglies.2.can/couldhavedone对过去发生行为的可能性进行推测:刚才我还看见他了，所以他不可能出国的。Isawhimjustnowsohecouldn’thavegoneabroad.门是锁着的，所以她不可能在家。Thedoorwaslocked.Shecouldn’thavebeenathome.3.Can/couldhavedone“本可以，本来可能已经”用于肯定句中，表示对过去发生的事情做出的判断，你本来可以考的更好。Youcouldhavehadabettermark.May/might1.May/might表示推测时，只能用于陈述句，表示对现在或将来要发生的动作把握不大。她们明天可能会到这里来。Theymaycomeheretomorrow.他们可能还在等我们呢。Theymaybestillwaitingforus.2.might可用于指过去的行为或者表示可能性更小。他也许在作功课吧。Hemightbedoinghishomeworknow.我问他我是否可以离开。IaskedhimifImightleave.Iaskedhim“MayIleavenow?”3.might/mayhavedone,表示对过去发生的动作进行可能性推测，他可能去医务室了。Hemayhavegonetotheclinic.他可能已经从报纸上知道这个消息了。Hemighthavereadaboutthenewsinthenewspaper.can/could1.Can/could表示推测时，只能用在否定句或疑问句中。2.can/couldhavedone对过去发生行为的可能性进行推测:3.Can/couldhavedone“本可以，本来可能已经”用于肯定句中，表示对过去发生的事情做出的判断，May/might1.May/might表示推测时，只能用于陈述句，表示对现在或将来要发生的动作把握不大。2.might可用于指过去的行为或者表示可能性更小。3.might/mayhavedone,表示对过去发生的动作进行可能性推测，Keytosomeexercises:KeytoPage85:PierreLoiselusedtowork___agovernmentoffice.OnedayheandhiswifeMathildereceivedaninvitation_____aball____thepalace.Mathildespent400franc____anewdressbuthadnomoremoney___jewellery.Sheborrowedabeautifulnecklace_____herfriendJeanne.Thecouplehadaverygoodtime___thepalace.But_____theballMathildelostthenecklace.Theyborrowedmoneytobuyanewdiamondnecklace____Jeanne.Anecklavethatlookedexactlythesame___Jeanne’scostthem36,000francs._____theyreturnedthenecklace,,theyhadtoworkdayandnight____tenyearstopaybackthemoneytheyhadborrowed._____MathildemetJeanneagain,shehadchangedsowhentoatforforfromatafterforasAfterforinmuch______Jeannecouldnotrecogniseher.Shedidnotknow______thenthatthenecklaceshehadborrowedwasnotmade____diamonds.Ithadbeenworth500francs____most.thatuntilofat1.Ithinkthetigermustbeintheboxonthe______becauseOr..Onthe___because2.Ithinkthetigercan’tbeintheboxonthe_____becauseOr…onthe_____becauserighttheprincesswantstosavetheyoungman’slife.lefttheprincessdoesn’twanttheyoungmanmarrytheyoungwomanleftTheprincessdoesn’twanttheyoungmantomarrytheyoungwoman.rightTheprincessdoesn’twanttheyoungwomantodie/beeatenbythetiger.3.Ithinktheprincessmaywanttohelptheyoumanmarrythebeautifulyoungwomanbecause4.IthinktheprincessmaynotwanttoseetheyongmangointotheboxwiththeyoungwomaninitbecauseShedoesn’twanttheyoungmantodie/beeatenbythetiger.Shedoesnotwantthemantomarrytheyoungwoman.