Unit2Let'sCelebrate!UsinglanguageGrammar課件高一英語

外研必修第二冊UsinglangugeUnit2Let'scelebrate!aThatiswhyLettersfromFatherChristmas

couldbetheperfectbook...b

Thechildrenmusthavebeenveryexcitedastheyopenit.c...theymightnotreceivetheirpresentsiftheywerenotgood.Thewordsinredare___________.Whatdothewordsinredindicate:anorder,arequest,abilityorpossibilityLookatthesentencesfromthereadingpassageandanswerthequestions.Willthemeaningofsentence(a)changeifwereplace“could”with“must”or“might”Whathappensifwechange“must”and“might”insentences(b)and(c)into“could”Nowlet'sreadmoreexamples.Thespeakerisquitesureaboutthestatement.“Could”and“might”haveasimilarmeaningwhenindicatingpossibility.modalverbsmustmightcouldcouldThespeaker

isnotsureaboutthestatement,andit'sonlyapossibility.It's

impossibleforthechildrentoreceivetheirpresents.1.Theletterswerealsobeautifully-illustrated-eachmusthavetakenitstrueauthor,Tolkien,alongtimetocomplete.2.Inanotherletter,FatherChristmascomplainedabouthowhecouldnot

stophishelpersplayinggameswiththetoysinsteadofwrappingthemup.3....othercharactersattheNorthPole,wecan

sharethetruespiritofgivingatChristmastime.4....TolkienmayhavebeentherealFatherChristmas.1.Theletterswerealsobeautifully-illustrated-each_______________(take)itstrueauthor,Tolkien,alongtimetocomplete.2.Inanotherletter,FatherChristmascomplainedabouthowhe____________(stop)hishelpersplayinggameswiththetoysinsteadofwrappingthemup.3....othercharactersattheNorthPole,we___________(share)thetruespiritofgivingatChristmastime.4....Tolkien______________(be)therealFatherChristmas.Fillintheblankswithappropriatewords.cansharecouldnotstopmusthavetakengoReadymayhavebeenFocuson基本用法情態(tài)動詞must,can,could,may,might等都有表推測的用法，都可以對過去，現(xiàn)在或?qū)淼那闆r是否發(fā)生做出語氣強(qiáng)弱不同的推測。情態(tài)動詞表推測1根據(jù)推測語氣的強(qiáng)弱，選擇情態(tài)動詞。1.在肯定句中表推測:(1)Youmusttellmeallaboutyournewfriend.

(2)Hecouldbeathome.Hemaybeathome.Hemightbeathome.你必須告訴我有關(guān)你新朋友的一切。他可能在家。could,may,might語氣依次減弱，表示“可能，也許”。must語氣最強(qiáng)，表示“肯定，一定”；(非常肯定)（很可能）（僅僅可能而已）（或許，非常不確定）2.在否定句中表推測:(1)Itcan'tsnowinsummer.may/mightnot語氣較弱，表示“可能不”；mustn't表示“禁止”，不用于否定推測。我們可能哪里也去不成。(2)Wemightnotgoanywhere.Youmustn'ttellalietoparents.夏天不可能下雪。你不能對父母說謊。can't,couldn't語氣較強(qiáng)，表示“不可能”；3.在疑問句中表推測:(1)Couldhehavefinishedthetask他可能把任務(wù)完成了嗎？(2)Canhebeathomenow他現(xiàn)在能在家嗎？（語氣較為委婉，可能性較?。ㄕZ氣較強(qiáng)）疑問句中用can/could（能……？），could語氣更加委婉不確定。2情態(tài)動詞表推測的三種時(shí)態(tài)。1.“情態(tài)動詞+be/bedoing/動詞原形”表達(dá)對現(xiàn)在情況或此時(shí)此刻正在發(fā)生的事情的推測。(3)Hemust

workveryhard.(=I'msurehegenerallyworksveryhard.)他一定工作很努力。(2)Theymaynotbehavingfun.(=Idon'tthinktheyarehavingfun.)他們可能并不開心。(1)Hecan'tbeathomeatthistime.(=Idon'tthinkheisathomeatthistime.)這個(gè)時(shí)候他不可能在家。2.“情態(tài)動詞+動詞原形”表達(dá)對將來情況的推測。?(1)Shemustarrivebefore5.

(=I'msureshewillarrivebefore5.)5:00前她一定到。(2)Shemaywalkmilesandmilesamongthehillswithoutmeetinganyone.(=It'sprobablethatshewalkmilesandmilesamongthehillswithoutmeetinganyone.)她可能會在山里一連走好幾英里都遇不到一個(gè)人。(1)may/mighthavedone

3.“情態(tài)動詞+have+V-ed”①Theymighthavegotlost.②Youmayhavemisheardher─I'msureshedidn'tmeanthat.他們可能迷路了。表示對已發(fā)生事情的不肯定推測你可能聽錯(cuò)她的話了——我肯定她不是這個(gè)意思。①Emmamusthavebeenveryupset.②Ithinkwemusthavetakenawrongturningsomewhere.(2)musthavedone

表示對已發(fā)生情況的推測，通常用于肯定句艾瑪一定很難過。我覺得我們一定是在什么地方拐錯(cuò)了路。might比may更加不確定①Youcan’thaveforgottenher.②Wherecanshehaveputit(3)canhavedone

表示對已發(fā)生情況的推測，通常用于否定句或疑問句你不可能已經(jīng)忘了她。她到底把它放在哪兒了呢？①Couldshehaveforgottenmyaddress②Hecouldnothavebeenmorethan16atthattime.(4)couldhavedone

表示對過去情況的推測，多用于否定句或疑問句她會忘記我的地址嗎？他當(dāng)時(shí)不可能超過16歲。情態(tài)動詞表推測時(shí)的反意疑問句、附加疑問句部分一般不再用情態(tài)動詞表示推測語氣。而是根據(jù)情態(tài)動詞之后的動詞及時(shí)間狀語或上下文確定具體形式。(1)Thatgirlmustbeyoursister,isn'tshe(2)Hemusthaveleftyesterday,didn'the那個(gè)女孩一定是你的妹妹，是嗎他昨天一定走了，是嗎Rewritetheunderlinedsentencesintheconversationusingcan/could,may/might

andmust.Possibleanswers!Youmustbetirednow!Itmay/might/couldbehim.ThatmustbeLucy.Thatcan'tbeLucy.Theymay/might/couldbefromourschool.P172Lookatthepictureandmakeasmanysentencesaspossibleusingcan/could,may/might

andmust.Themanwithawalletinhishandmightbeabitreluctanttopay.Thecashiermightbefeelinguncomfortableasheissweatingalot.Possibleanswers!Thewomanwithglassesmaybeverytiredtogetupsoearlyandcarrysomanybags.P1731.（2022天津卷3月）Itusedtobethatyou___driveformilesherewithoutseeinganotherperson,butnowtherearehousesandpeopleeverywhere.A.need B.should C.could D.must4.（2018天津卷）Ican'tfindmypurse.I___itinthesupermarketyesterday,butI'mnotsure.A.shouldleave B.musthaveleftC.mightleave D.couldhaveleft2.（2019天津卷）Mywalletwasgone._________________________________.（我只可能把它落在了G9公共汽車上。）IcouldonlyhaveleftitontheG9bus3.（2018北京卷）Intoday'sinformationage,thelossofdata____causeseriousproblemsforacompany.A.need B.shouldC.can D.mustGrammarFocus情態(tài)動詞表推測三種時(shí)態(tài)過去現(xiàn)在情態(tài)動詞+have+V-ed情態(tài)動詞+be/bedoing/動詞原形將來情態(tài)動詞+動詞原形根據(jù)語氣強(qiáng)弱選擇肯定句否定句must最強(qiáng)can't,couldn't最強(qiáng)could,may,might依次減弱may/mightnot較弱can語氣較強(qiáng)could語氣更加委婉不確定疑問句注：另附word文檔，點(diǎn)此鏈接。Ⅰ.選擇括號內(nèi)適當(dāng)?shù)膬?nèi)容填空。1.Itistoolatetogoback.We_________(may/must)goon.2.Thetemperatureinthemountains_________(must/can)beverylowatnight,soyou'dbettertakesomemoreclothes.3.Thelightisnoton.TheGreens_________(mustn't/can't)beathomenow.4.Hesaidhe_________(might/can)cometomorrow,butIamnotsureaboutthat.5.Yoursisterboughtsomuchfruit.She_________(must/shall)likeeatingit.mustcancan'tmightmustⅡ.根據(jù)漢語提示完成句子。1.Yourson___________________(可能正在做)hishomeworkathomenow.2.It_________________(肯定是)David,becausehehasjustcalledmesayingthathewillvisitus.3.Sincetheroadiswet,it_________________(肯定下雨了)lastnight.4.He__________________________(不可能迷路).Idrewhimamap.5.Mary____________________(可能不知道)thesecret.may/mightbedoingmustbemusthaverainedcan't/couldn'thavegotlostmay/mightnotknowⅢ.用can,must或might的適當(dāng)形式完成對話。1.—Areyougoingtoa