Unit2Let'sCelebrate!Usinglanguage课件高一英语

Unit2Let’scelebrate!UsingLanguage蔡文ReviewInUnit1,we’velearnedthefollowingmodals:beabletodarehadbetterneedhaveto情态动词表推测must,should,can,could,may,might都可表推测情态动词+动词原形情态动词+havedone（表示对目前的动作或状态进行推测）（表示对已经发生情况的推测）两种情况must表推测1.

must表示推测时意为“一定，肯定”，推测的语气最强。

HemustbeAmerican.(=

ItiscertainthatheisAmerican.)

他一定是个美国人。2.must表示推测时，只能用于肯定句，不用于否定句和疑问句。

如果表示“一定不，肯定不”，应用can’t，不能用mustn’t,

mustn’t表示“禁止”

如询问某种可能性时，应用can。Hemustknowmyaddress.Hecan’tknowmyaddress.Canheknowmyaddress?他肯定知道我的地址。（一定）他不可能知道我的地址。（一定不）他可能知道我的地址吗？（询问可能性）must表推测3.must表示推测时，可以推测现在的情况、正在发生的情况和过去已经发生的情况。Johnmustbeathome.Thelightison.It’s12o’clock.Theymustbehavinglunch.Itmusthaverainedlastnight,forthegroundiswet.（现在）（此刻）（过去）Exercise1.You______behungryafterallthatlongwalking.2.-ItmightbeJohnwhoisintheoffice.-No,it______behim.Isawhimoffattheairporthalfanhourago.3.He___________________(complete)hiswork;otherwise,hewouldn’tbeenjoyinghimselfbytheseaside.mustcan’tmusthavecompletedcan/could表推测can用于肯定句时，表示有时可能会出现的情况。can表示对现在的动作或状态进行主观的猜测时通常只用于否定句和疑问句。1.Joggingcanbeharmfultothehealth.2.Youcan’tbehungry,foryouhadlunchonlytwohoursago.3.Canhebeourteacher?4.Hecouldn’thavewatchedTVyesterdayforheknewhewouldhaveanexam.昨天他不可能看电视了，因为他知道快要考试了。can’t/couldn’thavedone表示对过去事实推测，意为“不可能做过……”。Exercise1.Althoughyou______findbargainsinLondonoccasionally,it’sgenerallynotacheapplacetoshop.2.ThankyousomuchSir!WithoutyourhelpI________________(pass)thetest.3.Mr.Smithisontimeforeverything.How__________itbethathewaslatefortheimportantmeeting?cancouldn’thavepassedcan/couldmay/might表推测1.may/might表示把握不大的推测，用于肯定句和否定句，不能用于疑问句。might在语气上比may更委婉，表示的可能性更小。1)Hemay/mightbeAmerican.他可能是美国人。2)He

may/might

notbeathome.他也许不在家。Hemay/might

beathomenow.Hemay/mightbesleepingnow.Thesestudentsmay/mighthaveseenthefilmbefore.Hemay/mightgotoBeijingtomorrow.（现在）（此刻）（过去）（将来）2.may/might可以推测现在的情况、正在发生的情况、过去已经发生的情况以及将来的情况。ExerciseSorry,I’mlate.I______________________

(turn)offthealarmclockandgonebacktosleepagain.2.-Excuseme.IsthistherightwaytotheChildren’sPalace?-Sorry,Iamnotsure.Butit______be.may/mighthaveturnedmight根据句意，用情态动词的正确形式填空。1.Idon’tknowwheresheis,she___________beinWuhan.2.Theroadiswet.It________________(rain)lastnight.3.-Lindahasgonetowork,butherbicycleisstillhere.-Oh,Iguessshe_____________________(go)bybus.5.Mike_______________(find)hiscarkey,forhecametoworkbybusthismorning.may/mightmusthaverainedmay(might)havegonecan’thavefoundP22Rewritetheunderlinedsentencesintheconversationusingcan/could,may/mightandmust.(Atafancydressparty.)Chris:Ispentagesputtingupalltheballoonsandflowerslastnight.Jean:Iexpectyouarefeelingtirednow!Chris:Yes,Iam.Look,thatguyisdressedasBatman.IsthatMike?Jean:It’spossiblyhim.Checkoutthatgirloverthere.I’msurethat’sLucy.Chris:No,Idon’tthinkthat’sLucy.Lucyisn’tthattall.Jean:Lookatthosetwoguysdressedaschickens!Oh,they’rewavingatus!Maybethey’refromourschool.Chris:Let’sgoandfindout.Youmustbetirednow!Itmay/might/couldbehim.ThatmustbeLucy.thatcan’tbeLucy.Theymay/might/couldbefromourschool.Activity2Lookatthepictureandmakeasmanysentencesaspossibleusingcan/could,may/mightandmust.Example:Thecustomersmusthavegotupveryearly.Activity3Grammar:Modals(2)Themanwithawalletinhishandmightbeabitunwillingtopay.Grammar:Modals(2)Thewomaninredmustbeveryexcitedtobuysomanythings.Grammar:Modals(2)Thewomanwithglassesmaybeverytiredtogetupsoearlyandcarrysomanybags.Grammar:Modals(2)Thecashiermightbefeeling

uncomfortableasheissweatingalot.Grammar:Modals(2)1.ThatiswhyLettersfromFatherChristmascouldbe/mustbe/mightbetheperfectbook...那就是为什么《圣诞老人的来信》可能/一定/或许是一本完美之书……couldbe:indicatepossibilitymustbe:indicatesurenessmightbe:indicatelesspossibility情态动词+动词原形，表示对现在的推测Grammar:Modals(2)2.Thechildrenmusthavebeen/couldhavebeen/mighthavebeenveryexcitedastheyopenedit.孩子们打开它的时候一定/可能/或许很兴奋。musthavebeen:quitesureaboutthestatementcouldhavebeen:notverysureaboutthestatementmighthavebeen:notsureaboutthestatement情态动词+完成式，表示对已发生情况的推测Grammar:Modals(2)3....theymight/could/mustnotreceivetheirpresentsiftheywerenotgood.如果他们表现不好，他们可能收不到/就收不到/绝不能收到礼物。mightnot:indicatepossibilitycouldnot:indicateimpossibilitymustnot:theyarenotallowedtoreceivethepresentsGrammar:Modals(2)情态动词(modals)没有人称、数的变化必须和其他动词一起构成谓语用来表示态度、愿望、推测情态动词对现在和未来的推测对过去的推测使用句型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/could+动词原形can/couldhavedone否定句，疑问句（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”should+do/beshouldhavedone肯定句，否定句，疑问句表推测时，英语中只使用must>may>might>maynot>can't这五个表达的语气依次递减：must：一定（语气肯定）>may：也许（不很肯定）>might：或许（比may语气更弱）

>maynot：也许不（表否定）>can't：一定不（must的反义）Conclusion

1.---I

wonderwhySaralooksworriedtoday.---I’mnotsure,butshe_____asmallaccidentdrivinghere.A.couldhave B.mighthave C.mighthavehad D.musthavehad2.Helen____goonthetripwithus,butsheisn’tquitesureyet.A.shall B.must C.may D.can3.Itwasaredlight,William.You____thecar.---