Period2Usinglanguages

Unit2Let'scelebrate!1.Togettoknowsomemodalverbs.2.Tolearnhowtousemodalverbstomakeprediction.LearningaimsLookatthesentencesfromthereadingpassageandanswerthequestions.aThatiswhyLettersfromFatherChristmascouldbetheperfectbook…bThechildrenmusthavebeenveryexcitedastheyopenedit.c…theymightnotreceivetheirpresentsiftheywerenotgood.Leading-inWhatdothewordsinredindicate:anorder,arequest,abilityorpossibility?

情態動詞must,can/could,may/might均可表示推測,它們可以對過去、現在或將來的情況作出語氣強弱不同的推測。1.把握推測語氣的特點。表示肯定的推測時，各情態動詞語氣從弱到強依次為might→may→could→can→must；表示否定的推測時,can’t/couldn’t語氣較強，意為“不可能”；maynot/mightnot語氣較弱，意為“可能不”。

Grammar

Modalverbs(2)注意：must的否定形式mustn’t不表示否定推測，而是表示“不許可”或“不應該”。2.基本用法：can＆couldmay＆mightmust1.表示能力eg.IcanspeakfluentEnglishnow,butIcouldn’tlastyear.2.在肯定句中，表示客觀可能性，并不涉及具體某事會發生，常用來說明人或事物的特征。要表達具體某事實際發生的可能性時，不用can，需用could，may，might。eg.Hecanbeveryforgetfulsometimes.3.表示對現在的動作或狀態進行主觀的猜測，主要用在否定句和疑問句中。eg.Canthemanovertherebeourheadmaster?can&could4.表示驚異、懷疑、不相信等態度，主要用在否定句、疑問句和感嘆句中。eg.Thiscan’tbetrue.5.表示請求和允許。表示請求，口語中常用could代替can，使語氣更委婉。特別注意：（1）could用來表示請求時，語氣委婉，主要用于疑問句，不能用于肯定句，答語應用can（即：could不能用于現在時態的簡略答語中）。如：—CouldIuseyourdictionary?—Yes,youcan.(否定回答可用：No,I’mafraidnot.)(2)can和beableto辨析can(could)和beableto都可以表示能力，意思上沒有區別。但can只有現在式和過去式，而beableto則有更多的形式。【即學即練】1.Itwassonoisythatwe________hearourselvesspeak.

2.—I_______thankyouenoughforwhatyouhavedoneforme.—You’rewelcome.3.他有可能是我們的老師嗎？______________________?can'tcan'tCanhebeourteacher1.表示請求和許可，在疑問句中，might可以代替may，它表示的語氣更加委婉。----MayIhaveafewwordswithyourmanager?----Yes,youmay.知識歸納：maynot表示“不可；不許”時，語氣較強，有命令強制的意味，常可用mustn't代替，用來回答問句“MayI...?”may&might2.表示推測might和may表示對現在、將來的推測，多用于肯定句中或否定句中。對過去的推測要用may/mighthavedone.might比may的可能性更小。3.may可以用于祈使句中，表示祝愿，其結構為：May+主語+動詞原形“。Mayyousucceed!祝你成功！【即學即練】mightmay1.Helen______goonthetripwithus,butsheisn’tquitesureyet.2.—Ileftmyhandbagonthetrain,butluckilysomeonegaveittoarailwayofficial.

—Howunbelievableitistogetitback!Imean,

someone_________havestolenit.1.表示“必須，應該”之意，語氣比should，oughtto強烈。其否定形式mustn’t表示“不準，不應該，禁止”等意。eg.Everybodymustobeythelaw.2.在回答帶有must的問句時，否定回答常用needn’t或don’thaveto，表示“不必”，而不用mustn’t。eg.—MustIcomebackbeforeten?—Yes，youmust.(No,youneedn’t.)3.表示有把握的推測，意為“一定、準是、想必”，只用于肯定句中。eg.Itmustbemymother.must【即學即練】mustmust1.You_______betiredafterthelongtrip,aren’tyou?2.You________beCarol.Youhaven’tchangedabitafteralltheseyears.3.It________________________,forthegroundiswetthismorning.昨天晚上一定是下雨了，因為今早地面是濕的。musthaverainedlastnightSummary情態動詞（2）基本用法：can&couldmay&mightmust語氣特征1.Rewritetheunderlinedsentencesintheconversationusingcan/could,may/mightandmust.Exercise(Atafancydressparty)Chris:Ispentagesputtingupalltheballoonsandflowerslastnight.Jean:Iexpectyouarefeelingtirednow!Chris:Yes,Iam.LookthatguyisdressedasBatman.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.Youmustfeeltirednow!Itmay/might/couldbehim.ThatmustbeLucy!thatcan’tbeLucy!Theymay/might/couldbefromourschool.(1)Ifyou_______smoke,pleasegooutside.A.canB.shouldC.mustD.may(2)—Idon’treallylikeJames.Whydidyouinvitehim?—Don’tworry.He__________come.Hesaidhewasn’tcertainwhathisplanswere.A.mustnot B.neednot C.wouldnot D.mightnot2.Choosethebestanswers.(3)Thetrafficisheavythesedays.I

arriveabitlate,socouldyousavemeaplace?A.canB.must