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1、Unit2 Unit2Healthyeating Grammar Underlinethesentencescontainingmodalverbsinthereadingpassageandusethefunctionwordsbelowtoexplainthemeaningofthemodalverbs IntentionDutyPermissionPossibilityGuessingAbility possibility possibility possibility guessing intention intention ability duty intention duty po
2、ssibility possibility ability Modalverbsareusedtoexpressthespeaker smeaningofintention duty permission guessing ability etc 1 should和oughttoa should oughtto都可表示 应该 oughtto用于表示按道理应当 常指客观的义务或责任 大多数情况下可用should代替 但比should语气重 Ishouldhelpherbecausesheisintrouble Yououghttotakecareofthebaby Modalverbs b 表示
3、劝告 建议或命令时 should和oughtto可通用 但在疑问句中常用should oughtto的否定式为oughtn tto或oughtnotto Youshould oughttogotoclassrightaway Iopenthewindow 我可以开窗吗 Whatshouldwedonext Should You oughtto leaveinsuchahurry 你不应该离开的这么匆忙 oughtn t oughtnotto c should oughtto都可表示推测 Heoughtto shouldbehomebynow Thisiswheretheoiloughtto s
4、houldbe 注意 should和oughtto后面跟动词不定式的完成式 其肯定句表示 过去应该做而未做 其否定句则表示 过去不该做但做了 You thedecisionaweekago 你应该在一周前就做决定 I suchafoolishmistake 我不应该犯这样愚蠢的错误 多数情况下 oughtto可与should互换使用 oughtto的反意疑问句用shouldn t替代 should oughttohavemade shouldn thavemade YououghttohavehelpedhimwithhisEnglish A won tyouB oughtnotyouC sh
5、ouldn tyouD wouldn tyou 2 must和havetomust的用法1 表示主观的义务和必要 主要用于肯定句和疑问句 意思为 必须 得 要 由must引起的疑问句 肯定回答要用must或haveto 否定回答要用needn tdon thaveto 意思是 不必 must的否定形式mustn t表示禁止 意思是 不能 不许 如 MustIfinishthetaskrightnow 我现在必须完成这个工作吗 Yes youmust Yes youhaveto 是的 No you No youdon thaveto 不 不必 Youmustn tcomeherewithoutp
6、ermission 未经允许 你不能来这儿 needn t haveto的用法 1 must表示一种主观的需要 而haveto表示一种客观的需要 意思是 不得不 如 Ihavetoattendanimportantmeetingthisafternoon 今天下午我不得不参加一个重要的会议 Motherisout soIhavetolookaftertheshop 妈妈不在家 因此我不得不照看商店 2 haveto的否定形式是don thaveto 相当于needn t 如 Theydon thavetobuyacomputeratpresent 他们目前没有必要买电脑 haveto的第三人称
7、单数形式是hasto 一般过去式是hadto 一般将来式是willhaveto e g LiHuahastopassanexaminationbeforehecanstartwork Mycarwasbroken soIhadtowalkhome It llhavetobeonaSunday I llbeworkingeveryotherday Thebosshasgiveneveryoneaspecialholiday sowe gotoworktomorrow A can tB mustn tC needn tD shouldn t 点拨 考查情态动词 根据题意 可知这里表示 没有必要 故
8、只能选C项 Whatdoyouthinkwecandoforouragedparents You doanythingexcepttobewiththemandbeyourself A don thavetoB oughtn ttoC mustn tD can t 点拨 根据题意 除了和他们呆在一起做你自己外 没有必要做任何事情 可知这里选择don thaveto表示 不必 故选A项 3 must和needneed作情态动词时 只能用于疑问句和否定句 构成否定句和疑问句时不借助于助动词do NeedIfinishtheworktoday Yes youmust No youneedn t b
9、must的肯定形式表示 必须 否定式表示 禁止 严禁 Youmustcomehere Youmustn ttakethebookawayfromthelibrary Choosesuitablemodalverbsbelowtocompletethefollowingdialogues ought oughtn ttoshould shouldn twillmustn tneedn t don t havetocan can t 1 Sam HowcanIgrowthinner Mum Mum Well you eatfoodwithplentyoffibrethathelpsyoudiges
10、tbetter Andyou stopdrinkingcolaoreatingsweetfood haveto should Sam DoesitmeanI eatmyfavouritefriedchickenanymore Mum Notexactly ifyoulovefriedchicken you giveitup Justeatitlessoften You worrytoomuch alittlefriedchicken doyougood shouldn t needn t don thaveto needn t shouldn t will 2 Doctor Youaresic
11、kbecauseyou veeatenpoisonousmushrooms Wheredidyougetthem Lucy Ipickedthemintheforest Iknowwe eatfreshvegetables Doctor Oh butyou eatthemuntilyou resuretheyarenotpoisonous Lucy Thankyou doctor I llbemorecarefulnexttime haveto mustn t 3 Charles IwishIcouldseethingsclearlyinthedark Tom Eatingcarrots he
12、lpyouseebetter You eatsomeeveryday oughtto should 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 ou
13、ghtnotto needn t don thaveto oughtto hasto Exercises 5 Tom havetoldmeyoursecret buthemeantnoharm 6 Thesunisshiningbrightlyinacloudlesssky it beafinedaytoday 7 Youdon tlookwell You gotoseethedoctor 8 Adograninfrontofmymother scarandmymother stopveryquickly oughtnotto oughtto oughtto hadto I 得接受 yours
14、uggestion 2 You 你不能来这儿 withoutpermission 3 You 应当去照顾 yourbrother 4 Ithinkyou 应当去看 thedoctor II Translatethefollowingsentences havetoaccept mustn tcomehere shouldtakecareof oughttogotosee 5 Theteachertoldthestudentsthatthey 不应该在课堂上沉默不语 allthetime 6 You 就得不到我的支持 ifyoudosuchathing 7 Iwaitedforthetrainf
15、ortwohoursatthestationthismorning Well you 本来没有必要那么早去的 8 You 你千万不要再喝酒了 thedoctorwarnedhim mustn tdrinkanymore oughtnotto shouldn tkeepsilentinclass shallnotgetmysupport needn thavesetoffsoearly III 阅读下面的对话 按照句子结构的语法性和上下文连贯的要求 在空格处使用合适的情态动词填空 Doyoucallthatahat Isaidtomywife You besorudeaboutit mywife
16、answeredasshelookedatherselfinthemirror Isatdownononeofthosemodernchairswithholesinitandwaited Wehadbeeninthehatshopforhalfanhourandmywifewasstillinfrontofthemirror needn t We buythingswedon tneed Iremarkedsuddenly Iregrettedsayingitalmostatonce You havesaidthat mywifeanswered I remindyouofthatterribletieyouboughtyesterday mustn t needn t needn t Ifinditbeautiful Isaid Aman neverhavetoomanyties Andawoman havetoomanyhats sheanswered Tenminuteslaterwewalkedoutoftheshoptogether Mywifewaswearingahat
