Unit2Unit2GrammarUnderlinethesentencescontainingmodalverbsinthereadingpassageandusethefunctionwordsbelowtoexplainthemeaningofthemodalverbs.IntentionDutyPermissionPossibilityGuessingAbilitypossibilitypossibilitypossibilityguessingintentionintentionabilitydutyintentiondutypossibilitypossibilityabilityModalverbsareusedtoexpressthespeaker’smeaningofintention,duty,permission,guessing,ability,etc.1.should和oughttoa.should,oughtto都可表示“應(yīng)該”。oughtto用于表示按道理應(yīng)當(dāng)，常指客觀的義務(wù)或責(zé)任，大多數(shù)情況下可用should代替，但比should語(yǔ)氣重。Ishouldhelpherbecausesheisintrouble.Yououghttotakecareofthebaby.Modalverbsb.表示勸告、建議或命令時(shí)，should

和oughtto可通用，但在疑問(wèn)句中常用should。oughtto的否定式為oughtn’tto或oughtnotto。Youshould/oughttogotoclassrightaway.________Iopenthewindow?我可以開(kāi)窗嗎？Whatshouldwedonext?ShouldYou_____________________(oughtto)leaveinsuchahurry.你不應(yīng)該離開(kāi)的這么匆忙。oughtn’t/oughtnottoc.should,oughtto都可表示推測(cè)。Heoughtto/shouldbehomebynow.Thisiswheretheoiloughtto/shouldbe.注意：should和oughtto后面跟動(dòng)詞不定式的完成式,其肯定句表示“過(guò)去應(yīng)該做而未做”,其否定句則表示“過(guò)去不該做但做了”。You__________________________thedecisionaweekago.你應(yīng)該在一周前就做決定。I___________________suchafoolishmistake.我不應(yīng)該犯這樣愚蠢的錯(cuò)誤。多數(shù)情況下，oughtto可與should互換使用。oughtto的反意疑問(wèn)句用shouldn’t替代。should/oughttohave

madeshouldn’thavemadeYououghttohavehelpedhimwithhisEnglish,________?A.won’tyouB.oughtnotyouC.shouldn’tyouD.wouldn’tyou2.must和haveto

must的用法

1)表示主觀的義務(wù)和必要,

主要用于肯定句和疑問(wèn)句,

意思為“必須……，得……，要……”；由must引起的疑問(wèn)句，肯定回答要用must或have

to,

否定回答要用needn’tdon’t

have

to,

意思是“不必”；

must的否定形式mustn’t表示禁止，意思是“不能，不許”。如：

—

Must

I

finish

the

task

right

now?

我現(xiàn)在必須完成這個(gè)工作嗎？—Yes,

you

must.

/

Yes,

you

have

to.

是的。(—No,you_______./No,youdon’thaveto.不，不必。)Youmustn’tcomeherewithoutpermission.未經(jīng)允許，你不能來(lái)這兒。needn’thave

to的用法

1)must表示一種主觀的需要，而have

to表示一種客觀的需要，意思是“不得不”。如：

Ihavetoattendanimportantmeetingthisafternoon.

今天下午我不得不參加一個(gè)重要的會(huì)議。

Motherisout,soIhavetolookaftertheshop.

媽媽不在家，因此我不得不照看商店。2)have

to的否定形式是don’thaveto,相當(dāng)于needn’t。如：

Theydon’t

havetobuyacomputeratpresent.

他們目前沒(méi)有必要買電腦。

haveto的第三人稱單數(shù)形式是hasto，一般過(guò)去式是hadto，一般將來(lái)式是willhaveto。e.g.LiHua

hastopassanexaminationbeforehecanstartwork.Mycarwasbroken,soIhadtowalkhome.It’llhavetobeonaSunday.I’llbeworkingeveryotherday.Thebosshasgiveneveryoneaspecialholiday,sowe____gotoworktomorrow.A.can’t B.mustn’tC.needn’t D.shouldn’t【點(diǎn)撥】考查情態(tài)動(dòng)詞。根據(jù)題意,可知這里表示“沒(méi)有必要”,故只能選C項(xiàng)。─Whatdoyouthinkwecandofor ouragedparents?─You______doanythingexcepttobe withthemandbeyourself.A.don’thavetoB.oughtn’ttoC.mustn’t D.can’t【點(diǎn)撥】根據(jù)題意“除了和他們呆在一起做你自己外,沒(méi)有必要做任何事情?！笨芍@里選擇don’thaveto表示“不必”。故選A項(xiàng)。3.must和needneed作情態(tài)動(dòng)詞時(shí),只能用于疑問(wèn)句和否定句。構(gòu)成否定句和疑問(wèn)句時(shí)不借助于助動(dòng)詞do。

—NeedIfinishtheworktoday?—Yes,youmust./No,youneedn’t.b.must的肯定形式表示“必須”，否定 式表示“禁止、嚴(yán)禁”。

Youmustcomehere.Youmustn’ttakethebookawayfromthelibrary.Choosesuitablemodalverbsbelowtocompletethefollowingdialogues.ought/oughtn’ttoshould/shouldn’twillmustn’tneedn’t(don’t)havetocan/can’t1.Sam:HowcanIgrowthinner,Mum?Mum:Well,you_______eatfoodwithplentyoffibrethathelpsyoudigestbetter.Andyou______stopdrinkingcolaoreatingsweetfood.havetoshouldSam:DoesitmeanI_________eatmyfavouritefriedchickenanymore?Mum:Notexactly,ifyoulovefriedchicken,you________giveitup.Justeatitlessoften.You______________________________worrytoomuch:alittlefriedchicken____doyougood!shouldn’tneedn’tdon’thaveto/needn’t/shouldn’twill2.Doctor:Youaresickbecauseyou’veeatenpoisonousmushrooms.Wheredidyougetthem?Lucy:Ipickedthemintheforest.Iknowwe_______eatfreshvegetables.Doctor:Oh,butyou_______eatthemuntilyou’resuretheyarenotpoisonous.Lucy:Thankyou,doctor.I’llbemorecarefulnexttime.havetomustn’t3.Charles:IwishIcouldseethingsclearlyinthedark.Tom:Eatingcarrots________helpyouseebetter.You_______eatsomeeveryday.oughttoshouldⅠ.用oughtto,oughtnotto,haveto,don’thaveto,mustn’t,needn’t填空。1.You__________goacrosstheroadwhenthetrafficlightisonred.2.You_____________buyagift,butyoucanifyouwantto.3.Asstudents,we________putmoreenergiesintostudy.4.He________workovertimeinordertofinishthetaskbeforethisSaturday.mustn’t/oughtnottoneedn’t/don’thavetooughttohastoExercises5.Tom_____________havetoldmeyoursecret,buthemeantnoharm.6.Thesunisshiningbrightlyinacloudlesssky;it_________beafinedaytoday.7.Youdon’tlookwell.You_________gotoseethedoctor.8.Adograninfrontofmymother’scarandmymother________stopveryquickly.oughtnottooughttooughttohadtoI_______________(得接受)yoursuggestion.2.You_________________(你不能來(lái)這兒)withoutpermission.3.You_________________(應(yīng)當(dāng)去照顧)yourbrother.4.Ithinkyou_________________(應(yīng)當(dāng)去看)thedoctor.

II.Translatethefollowingsentences.havetoacceptmustn’tcomehereshouldtakecareofoughttogotosee5.Theteachertoldthestudentsthatthey____________________________________(不應(yīng)該在課堂上沉默不語(yǔ))allthetime.6.You______________________(就得不到我的支持)ifyoudosuchathing.7.—Iwaitedforthetrainfortwohoursatthestationthismorning.—Well,you________________________(本來(lái)沒(méi)有必要那么早去的).8.“You_____________________(你千萬(wàn)不要再喝酒了),”thedoctorwarnedhim.mustn’tdrinkanymoreoughtnotto/shouldn’tkeepsilentinclassshallnotgetmysupportneedn’thavesetoffsoearlyIII.閱讀下面的對(duì)話，按照句子結(jié)構(gòu)的語(yǔ)法性和上下文連貫的要求，在空格處使用合適的情態(tài)動(dòng)詞填空?！瓺oyoucallthatahat?’Isaidtomywife.‘You_______besorudeaboutit,’mywifeansweredasshelook