Unit2Let'sCelebrate!UsinglanguageModalverbs課件-高中英語(yǔ)

B2U2UsinglanguageModals(2)Lead-inReadthephotosandsentencesbelowandmakeinferences.WhereisBob?Whatwasthematterwiththeladyyesterday?Hemay

beinhisoffice.Ithoughtshemightbeillyesterday.Shemighthavebeenillyesterday.Lead-inWhichrestaurantisbetter?Thisrestaurantmustbeverygood.It’salwaysfullofpeople.Thatrestaurantcan’tbeverygood.It’salwaysempty.Lead-inHecalledmeyesterdayevening,butIdidn’thearit.Imust

have

beenasleep.must,can,could,may,might情態(tài)動(dòng)詞中：can,could,may,might,must都可表示推測(cè)。兩種句式：情態(tài)動(dòng)詞+動(dòng)詞原形情態(tài)動(dòng)詞+完成式（表示對(duì)目前的動(dòng)作或狀態(tài)進(jìn)行推測(cè)）（表示對(duì)已發(fā)生情況的推測(cè)）Modals情態(tài)動(dòng)詞表推測(cè)Modals1.Whatdothewordsinboldindicate:anorder,arequest,abilityorpossibility?Thewordsinboldindicatepossibility.2.What’sthedifferencebetween“musthavebeen”and“mustbe”?ThatiswhyLetterfromFatherChristmascouldbetheperfectbook…ThatiswhyLetterfromFatherChristmasmustbetheperfectbook…ThatiswhyLetterfromFatherChristmasmightbetheperfectbook…Possibility:must>could>mightmust表推測(cè)1.must表示推測(cè)時(shí)意為“一定，肯定”，推測(cè)的語(yǔ)氣最強(qiáng)。HemustbeAmerican.(=

ItiscertainthatheisAmerican.)

他一定是個(gè)美國(guó)人。2.must表示推測(cè)時(shí)，只能用于肯定句，不用于否定句和疑問(wèn)句。

如果表示“一定不，肯定不”，應(yīng)用can’t，不能用mustn’t，mustn’t表示“禁止”。如詢問(wèn)某種可能性時(shí)，應(yīng)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嗎？（詢問(wèn)可能性）must表推測(cè)3.must表示推測(cè)時(shí)，可以推測(cè)現(xiàn)在的情況、正在發(fā)生的情況和過(guò)去已經(jīng)發(fā)生的情況。Johnmustbeathome.Thelightison.It’s12o’clock.Theymustbehavinglunch.Itmusthaverainedlastnight,forthegroundiswet.[Attention]must表示推測(cè)時(shí)很少用于將來(lái)的情況，如“他明天一定會(huì)來(lái)。”不能說(shuō)：Hemustcometomorrow.可以說(shuō)：It’scertain/I’msurethathewillcometomorrow.（現(xiàn)在）（此刻）（過(guò)去）must表推測(cè)ExerciseYou______behungryafterallthatlongwalking.-It______beJohnwhoisintheoffice.-No,it______behim.Isawhimoffattheairporthalfanhourago.He___________________(complete)hiswork;otherwise,hewouldn’tbeenjoyinghimselfbytheseaside.mustmustcan’tmusthavecompletedcan/could表推測(cè)can用于肯定句時(shí)，表示客觀的可能性，客觀的可能性并不表示具體某事是否會(huì)發(fā)生，而用來(lái)說(shuō)明人或事物的特征。can表示對(duì)現(xiàn)在的動(dòng)作或狀態(tài)進(jìn)行主觀的猜測(cè)時(shí)通常只用于否定句和疑問(wèn)句。could表示推測(cè)時(shí)，不僅可用于疑問(wèn)句和否定句，還可用于肯定句，表示某事有可能發(fā)生或可能是事實(shí)。1.Joggingcanbeharmfultothehealth.2.Youcan’tbehungry,foryouhadlunchonlytwohoursago.3.Canhebeourteacher?4.Whocoulditbefrom?can/could表推測(cè)can’t/couldn’thavedone表示對(duì)過(guò)去事實(shí)推測(cè)，意為“不可能做過(guò)……”。can’t比couldn’t的語(yǔ)氣更強(qiáng)一些，但當(dāng)主句的謂語(yǔ)動(dòng)詞是一般過(guò)去時(shí)的時(shí)候，從句要用couldn’thavedone。couldhavedone還可以表示“過(guò)去本能夠做某事卻沒(méi)有做”。含有惋惜或責(zé)備的語(yǔ)氣，意為“本來(lái)是可以……的”。5.Hecouldn’thavewatchedTVyesterdayforheknewhewouldhaveanexam.昨天他不可能看電視了，因?yàn)樗揽煲荚嚵恕?.Hedidnotregretsayingwhathedidbutfeltthathecouldhaveexpressed

itdifferently.他不后悔說(shuō)了他所做的事，但是他覺(jué)得他本可以用另一種方式表達(dá)。can/could表推測(cè)Exercise-Hewassatisfiedwiththeresult,wasn’the?-No.Theexamwassodifficultthathe____________________

(pass)it.Mr.Smithisontimeforeverything.How__________itbethathewaslatefortheimportantmeeting?couldn’thavepassedcan/couldmay/might表推測(cè)1.may/might表示把握不大的推測(cè)，用于肯定句和否定句，不能用于疑問(wèn)句。might在語(yǔ)氣上比may更委婉，表示的可能性更小。Hemay/might

beAmerican.

他可能是美國(guó)人。Hemay/mightnotbeathome.

他也許不在家。may/might表推測(cè)2.may/might可以推測(cè)現(xiàn)在的情況、正在發(fā)生的情況、過(guò)去已經(jīng)發(fā)生的情況以及將來(lái)的情況。Hemay/might

beathomenow.Hemay/mightbesleepingnow.Thesestudentsmay/mighthaveseenthefilmbefore.Hemay/mightgotoBeijingtomorrow.（現(xiàn)在）（此刻）（過(guò)去）may/mighthavedone表示對(duì)過(guò)去事實(shí)不大肯定的推測(cè)，語(yǔ)氣較弱，意為“可能已經(jīng)……”；may/mightnothavedone為否定式，表示“可能還沒(méi)……”。（將來(lái)）may/might表推測(cè)ExerciseSorry,I’mlate.I______________________

(turn)offthealarmclockandgonebacktosleepagain.-Excuseme.IsthistherightwaytotheChildren’sPalace?-Sorry,Iamnotsure.Butit______be.You________________(give)himmorehelp,butyouweresobusy.Whatapity!Consideringhisabilityandexperience,he_______________

(do)better.mighthavedone還可以表示“本來(lái)可能或可以做某事但沒(méi)有做”。may/mighthaveturnedmighthavegivenmighthavedonemight1.Idon’tknowwheresheis,she___________beinWuhan.2.Theroadiswet.It________________(rain)lastnight.3.Philip________________________(behurt)seriouslyinthecaraccident.4.-Lindahasgonetowork,butherbicycleisstillhere.-She_____________________(go)bybus.5.Mike_______________(find)hiscar,forhecametoworkbybusthismorning.may/mightmusthaverainedmay(might)havebeenhurtmay(might)havegonecan’thavefound根據(jù)句意，用情態(tài)動(dòng)詞的正確形式填空。ModalsRewritetheunderlinedsentencesintheconversationusingcan/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/couldbe