【课件】Unit 5 Discovering Useful Structures 课件人教版（2019） 必修第三册

DiscoveringUsefulStructuresUNIT5Period4Bytheendofthisperiod,studentswillbeableto12345Completethebasic

understandingofthemodalverbMastertheusageofthepastfuturetense.……Objectives:Unit5THEVALUEOFMONEYDiscoveringusefulstructuresModalverbsModalverbsIfI______livemylifewithoutyounearmeThedays______allbeemptyThenightswouldseemsolongWithyouIseeforeverohsoclearlyI_____havebeeninlovebeforeButitneverfeltthisstrongOurdreamsareyoungAndwebothknowthey'lltakeuswherewewanttogoHoldmenowTouchmenowIdon'twanttolivewithoutyouNothing'sgonnachangemyloveforyouYou________knowbynowhowmuchIloveyouOnethingyou_____besureofI____neveraskformorethanyourloveNothing'sgonnachangemyloveforyouYou________knowbynowhowmuchIloveyouTheworld____changemywholelifethroughButnothing'sgonnachangemyloveforyouListentothesongandcompletethelyrics.hadtomightoughttocanoughtto

maywouldwillTheyarecalledmodalverbs.Theyareusedtoexpressability,obligation,possibility,intension,request,advice,etc.1.Youshouldcheckthecabhasabusinesspermit,andmakesureyouaskforareceipt.2.Trainsarefastandconvenient,butrushhourscanbeterrible.3.Todayrocketsareveryadvancedmachineswhichwecanusetosendastronautsintospace.4.Youshouldn’tgoonthoseships.5.Wecouldseethesunsettingbehindthewhitepagoda.6.MayIaskyousomequestionsaboutthemodernOlympics?7.Youmustn'tshowthislettertoanyoneelse.8.Foreignershavetotaketheirpassportswiththem.9.Youshouldn’tthrowawaythelittereverywhere.Youmustthrowitintotrashcan.10.Bynowhisrestaurantoughttobefullofpeople.1.You______checkthecabhasabusinesspermit,andmakesureyouaskforareceipt.2.Trainsarefastandconvenient,butrushhours____beterrible.3.Todayrocketsareveryadvancedmachineswhichwe____usetosendastronautsintospace.4.You_________goonthoseships.5.We______seethesunsettingbehindthewhitepagoda.shouldcancanshouldn’t

couldgo

Ready?6.____IaskyousomequestionsaboutthemodernOlympics?7.You_______showthislettertoanyoneelse.8.Foreigners_______taketheirpassportswiththem.9.You_________throwawaythelittereverywhere.You_____throwitintotrashcan.10.Bynowhisrestaurant________befullofpeople.Maymustn'thavetoshouldn’tmustoughtto*定义；*基本特征；*常见情态动词、其否定式、其缩略形式；*情态动词的表意功能；*常见情态动词的用法.Focuson基本用法情态动词

情态动词表示说话人的语气或对事物的态度，本身有一定的词义，但要与动词原形一起使用，给谓语动词增添情态色彩，表示说话人对有关行为或事物的态度和看法，认为其可能、应该或必要等。定义:情态动词情态动词的基本特征1）情态动词除ought和have外，后面只能接动词原型。

2）情态动词没有人称，数的变化，即情态动词第三人称单数不加-s。

3）情态动词没有非谓语形式，即没有不定式，分词，等形式。常见情态动词、其否定式、其缩略形式:情态动词否定式缩略形式cancouldmaymightshallshould情态动词否定式缩略形式willwouldmusthadbetteroughttocannot/cannnotcan'tcouldnotcouldn'tmaynot/mightnotmightn'tshallnotshan'tshouldnotshouldn'twillnotwouldnotmustnothadbetternotoughtnottowon'twouldn'tmustn'toughtn't/一.Weusemodalverbstotalkabout:1.Ability（能力）2.Obligation（义务）3.possibility（可能性）4.Permissionandprohibition（允许）5.Necessity表示必要性Thefunctionsofmodalverbs二.Wealsousemodalverbsto:6.Makerequests（提出请求）7.Intention

(意图和愿望)8.Giveadvice（提出意见）Tellthefunctionofthemodalverbs.1.Oliverbelievesthatwithamillion-poundbanknoteamancouldliveamonthinLondon.2.Wouldyoustepinsideamoment,please?3.Goodmorning,sir,wouldyoupleasecomein?4.Mayweaskwhatyou'redoinginthiscountry...?5.Well,Ican'tsaythatIhaveanyplans.6.Well,youmustn'tworryaboutthat.7.Couldyouoffermeworkhere?8.Ifyoudon'tmind,mayIaskyouhowmuchmoney...?9.Well,itmayseemluckytoyoubutnottome.10.Ifyou’llexcuseme,Ioughttobeonmyway.11.Youmustn'tthinkwedon'tcareaboutyou.12.Youcan'topenituntiltwoo'clock.possibilityrequestrequestpossibilityrequestrequestintentionnecessitypermission/prohibitionpermission/prohibitionrequestpossibility(1)表示能力。Mygrandmaiswellovereighty,butshecanreadwithoutglasses.(2)

表示客观可能性。Accidentscanhappentoanydrunkendriver.1.can/could(3)

表示请求和允许。—CanIhavealookatyourdesign?—Yes,ofcourseyoucan.(4)

表示惊讶、怀疑、不相信的态度。（主要用于否定句，疑问句和惊叹句）。Whatcanhebedoingatthistimeofnight?(5)cannever/can’t……too表示“无论怎样…也不过分”，“越…越好”。你过马路的时候再小心也不为过。

Youcan’tbetoocarefulwhilecrossingtheroad.

(1)

表示许可might

比may语气更加委婉，否定回答时可以使用can’t或mustn’t,表示“不可以”、“禁止”、阻止。--MayItakethisbookout?Yes,youcan.(No,youcan’t./No,youmustn’t.)2.may/might

(2)

用于祈使句中表示祝愿。

Mayyousucceed!(3)

与一些固定词组的搭配

mayaswell,mightaswell+doIt’sgettingdark.Wemayaswellwalkhome.

Imayaswellhavearestfirst.(1)表示请求、建议等，would比will委婉客气。sentencepattern

Wouldyouplease…Wouldyoumind…Wouldrather…Wouldyoulike…3.will/would(3)可表示经常性、习惯性、倾向性。翻译为“经常、惯于、总是”。Theoldman_______haveasmokeunderabigtreeeveryafternoonafterhefinishedhisfarmwork.

would(2)

表示意志、愿望和决心。

Iwillneverdothatagain.

门就是打不开!

Thedoorwon’topen.

(1)用于一，三人称疑问句表示征求对方的意见

和向对方请示Shall

thedriverwait?Whatshallwedonext?(2)

用于二三人称陈述句表示命令警告，允诺，威胁以及法律条文规定YoushallhavethebookwhenIfinishit

4.shall\should(3)

表示劝告和建议Youshouldstudyhard.(4)表推测Theyshouldhavearrivedbytwoo'clock(5)用于if条件句表示万一AskTomtoringmeupifyoushouldseehim.

(6)表竟然Idon'tknowwhyyoushouldbesorudeto

yourmother.(1)表示“必须；应该”。以must开头的问句，否定回答常用needn’t或don’thaveto，肯定回答用must。Youmustcometoschoolontime.(2)表示有把握的推测，只用于肯定句中。

Youmustbeill.Icanseeitfromyourface.(3)表示“非要；偏要”。Theyaresleeping.Mustyouplaythepianoatthistime？5.musthaveto表示“不得不，必须”，有人称、时态和数的变化。否定式为don’thaveto。Therearesomanymistakesinhisarticlethathehastorewriteit.

Youdon’thavetobuyagift,butyoucanif

youwantto.6.haveto【比较】must和haveto表示“不得不、必须”时，haveto与must意思上很接近。但must常表示说话人的主观看法；而haveto一般强调客观需要。I’mverytired.Imust

sitdownandhavearest.

Ihavetohurryupnow.Ihaveatraintocatch.7.oughttooughtto表示“应该；应当

”，可以表示有责任或义务而做某事。没有人称、数和时态的变化，否定式为

oughtnotto。Theyoughttoapologize.Heoughtn'ttohavebeendrivingsofast.8.hadbetterhadbetter，“最好”，缩写为“’d better”，表示提出建议、劝告或命令等，含有“应该做某事，有义务做某事”之意，一般适用于对晚辈、平辈。It's

half

past

two.

I

think

we

had

better

go

home.否定形式为hadbetternot，疑问句中hadbetter的否定形式有两种：Hadn’t +主语 +better + V原形+...?Had + 主语 + better not +V原形+…?

Fillintheblankswithsuitablemodalverbsinthebox.InthefilmTheMillionPoundBankNote,HenryAdamsisstuckinaforeigncountrywithoutmoneyandfriends,andwithnowheretostay.Whilethissituation______seemunusual,itcansometimeshappentotravellers.Incaseithappenstoyouonatripabroad,what_______youdo?First,andmostimportantly,you______staycalm.Fear______causeyoutobecomeconfused.Youneedtothinkclearly.Second,youshouldgotoyournearestconsulate.They_________beabletohelptosomeextent.Third,you_______dowelltocheckwithsomelocalcharities.They_______offerhelptotravellersinneed.Fourth,you____________avoidgettingintotrouble.You______thinkthatstealingsomemoneyorfoodwouldhelpyou,butyoushouldnotdoso.Gettingcaught_______ruinyourlife.may,must,can,oughtto,might,hadbetter,would,shouldmayshouldmustcanoughttowouldmightwouldhadbetterP542mightWorkinpairs.DiscussthescenefromTheMillionPoundBankNoteonpage52andshareyourunderstandingofthestory.Usemodalverbswhennecessary.A:Ithinkit’skindofRoderickandOlivertogiveHenrythemoney.B:I’mafraidIdisagree.Theyshouldn’tbemakingabetonhim.A:ButHenrymightgetintotroubleiftheydidn’tofferhimthemoney.B:Well,iftheyreallywantedtohelpHenry,theycouldofferhimajob.A:Maybeyou’reright.ButIguessthatwouldbeadifferentstory...P544Suggestedconversation:ThepastfuturetenseThepastfuturetense以上句子都使用了

将来时，表示从

看将要发生的动作。过去过去一、概念过去将来时表示从过去的某一时间来看将来要发生的动作或呈现的状态。可以这样理解：过去将来时的出发点是过去，即从过去某一时刻看以后要发生的动作或状态。Shewassixty-six.Inthreeyears，shewouldbesixty-nine.她66岁了。三年后，她是69岁。动词构成和用法：1)should/would(not)+V原形2)was/were(not)goingto+V原形3)was/were(not)to+V原形4)was/wereaboutto+V原形5)was/were+Ving-二、构成和用法1.should/would＋动词原形(1)表示从过去某时看来将要发生的动作或存在状态。常用于宾语从句中。Hesaidthathewouldwaitforusatthebusstop.他说他要在车站等我们。Shehopedthattheywouldmeetagainsomeday.她希望将来有一天他们能再见面。(2)表示过去的某种习惯性行为，只用would。Wheneverwehadtrouble，hewouldcometohelpus.每当我们遇到困难时，他总会给予帮助。2.was/were+goingto+动词原形(1)表示根据计划或安排即将发生的事。例1:Shesaidshewasgoingtostartatonce.她说她将立即出发。例2:Iwastoldthathewasgoingtoreturnhome.他告诉我他准备要回家。(2)还可表示根据当时情况判断有可能但不一定会发生某事。例:Itseemedasifitwasgoingtorain.看来好像要下雨。3.“was/wereto＋动词原形”表示曾计划做某事，如果计划的事情没有实现，要用不定式的完成式。Shesaidshewastotakeuptheposition.她说她要承担这个职务。Shesaidshewastohavetakenuptheposition，butlaterchangedhermind.她说她本打算承担这个职务的，但是后来改变了主意。4.was/wereabouttodo表示“即将、正要”。

例句：（1）SoonourseasonwasoverandIwasabouttomove.很快的，我们的学期要结束了，我即将搬走了。（2）Iwasabout