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Unit7Teenagersshouldbeallowedtochoosetheirownclothes.SectionAGrammarFocus-4ccryallnightstaybyone’ssidesleepinwarmarmsrunthroughthefieldmakesurekeepsb.fromdangergivesb.ahugliftuptalkback整夜哭待在某人身边睡在温暖的臂弯里穿过田野确定；确保使某人远离危险拥抱某人举起，提起回嘴；顶嘴Translatethephrases.watchscarymoviesgivesb.awfuldreamsbebackbytenthinkbacktothosetimescoughfordayshavescarydreamsbelateforschoolstayoutregretdoingsth.看恐怖电影带给某人恶梦在10点前回来回想那些时光咳嗽好几天做可怕的梦上学迟到待在外面；不回家后悔做过某事Ithinkstudentsshouldbeallowedtodohomeworkwithfriends.Sixteen-year-oldsshouldnotbeallowedtodrive.Doyouthinksixteen-year-oldsshouldbeallowedtochoosetheirownclothes?Lookatthesesentences.课前预习含情态动词的被动语态肯定句:主语+情态动词+be+动词过去分词.否定句:主语+情态动词+not+be+动词过去分词.疑问句:情态动词+主语+be+动词过去分词?GrammarFocus(一)将主动语态的宾语变成被动语态的主语。(二)将含情态动词的主动句式变成被动句式，即：“情态动词+动词原形”变成“情态动词+be+过去分词”，然后再在其后加“by+主动句中的主语(人称代词用宾格)”。by短语也可省略。请看下列各句：转变方法Youshouldfinishyourhomeworkfirst.Yourhomeworkshouldbefinished(byyou)first.Youcantakethismagazinehome.Thismagazinecanbetakenhome(byyou).GrammarFocus含情态动词的疑问句、否定句的变化均需借助于情态动词完成。1.一般疑问句：直接将被动语态的陈述句中的情态动词提前。Mustthistaskbefinishedatonce?这项任务必须立即完成吗？句式变换GrammarFocus注意：含情态动词的被动语态的一般疑问句的回答，应保留原情态动词，但must表“必须”时，其否定回答应用needn’t；need表“必要”时，其肯定回答应用must。如：---Mustmyexercisebookbehandedinnow?我的练习本必须现在上交吗？---Yes,itmust.是的，必须现在上交。（No,itneedn’t.不，不必现在上交。）---Needhebeoperatedonatonce?他必须立即手术吗？---Yes,hemust.是的，他必须。（No,heneedn't.不，他不必。）GrammarFocus2.特殊疑问句：由特殊疑问词加上被动语态的一般疑问句构成。Whenmustthistaskbefinished?这项任务必须在什么时候完成？3.否定句：在情态动词后面加上not或never即可，但must表必要时否定式为needn't。Thistaskneedn'tbefinishedatonce.这项任务没必要立即完成。GrammarFocus4.反意疑问句：借助情态动词构成附加疑问部分。如：Thisbridgecanbebuiltnextyear,can'tit?这座桥明年能建成，是吗？GrammarFocusTeenagersshouldbeallowedtochoosetheirownclothes.应该允许青少年选择他们自己的服装。Studentsshouldnotbeallowedtohavepart-timejobs.不应该允许学生们做兼职工作。Canthesebooksbetakenoutofthereadingroom?可以把这些书带出阅览室吗？Whenmusttheworkbefinished?这些工作必须什么时候完成？GrammarFocus2.Parentsshouldencourageteenagerstodosocialworkfortheircommunity.3.CanLucydoherhomeworktomorrowinstead?Teenagersshouldbeencouraged(bytheirparents)todosocialworkfortheircommunity.Canthehomeworkbedone(byLucy)tomorrowinstead?4aRewritethesentencesaccordingtotheexample.Practice4.DoyouthinkwemustkeepteenagersawayfromtheInternet?5.Parentsshouldgiveteenagerschancestomaketheirowndecisions.DoyouthinkteenagersmustbekeptawayfromtheInternet?Teenagersshouldbegivenchancestomaketheirowndecisions.PracticeThekeysbeaskedareallowed4bFillintheblankswiththecorrectformsofthewordsinbrackets.beeducatedstartmovetakecontinuePractice4cWhatrulesshouldanEnglishclubhave?Makealistofrulesforit.PracticeSampleDialogue1A:Membersshouldbeallowedtousedictionaries.B:Yes,buttheyshouldonlyuseEnglish-Englishdictionaries.1.MembersareallowedtouseEnglish-Englishdictionaries.PracticeA:Membersshouldn’tbeallowedtospeakChinese.B:Iagree.OnlyinthiswaycanyouimproveyourEnglish.SampleDialogue2PracticeYoungtreesshould________everyyear.A.beplantedB.plantedC.plantⅡ.按要求完成下列各句每空一词含缩写。1.Wemustdotheworkrightnow.(改为被动语态)___________________________________rightnow.ATheworkmustbedoneⅠ.选择最佳答案。2.Teenagersshouldbeallowedtogooutwiththeirfriendsonschoolnights.(改为否定句)Teenagers_____________________togooutwiththeirfriendsonschoolnights.3.Abookshouldbereadeachmonth.(改为一般疑问句)___________________________________eachmonth?shouldn’tbeallowedShouldabookberead1.Theirworkmust____________(finish)byfouro’clock.2.Yourhomeworkshould__________(do)byyourself.3.Thesebooksmustn’t__________(take)outofthereadingroom.4.Shouldthesefood_________(keep)dry?befinishedbedonebetakenbekeptIII.用所给词的适当形式填空。IV.句型转换1.Youshouldmakeupthebedeveryday.(改为被动语态)Thebed_____________________upeveryday.2.Wecan’tseestarsinthedaytime.(改为被动语态)Stars_____________________inthedaytime.3.Youmustreturnthebookontime.(改为被动语态的一般疑问句形式)_______thebook______________ontime?shouldbemadecan’tbeseenMustbereturned1.Todayalotofinformationcan_______online.A.receiveB.bereceivedC.isreceivedD.receiving答案：B【解析】被动语态。今天有很多信息能在网上收到，信息被收到要用被动语态。含有情态动词的被动语态的构成：情态动词+be+过去分词。例题解析2.—Mustwecleantheclassroomnow?—No,youneedn't.It______afterschool.A.maycleanB.mustcleanC.needbecleanedD.canbecleaned答案：D【解析】由句意可知it指classroom，it和clean为被动关系，所以用被动语态，含有情态动词的被动语态结构为“情态动词+be+动词过去分词”。排除A和B。need意为“需要”，can意为“可能，可以”。由句意“—我们必须现在就打扫教室吗？—不，不必要。可以放学后打扫”可知,故选D。例题解析3.Thesongremindsmeofmyoldschooldaysassoonasit______.A.isplayedB.playsC.willbeplayedD.willplay答案：A【解析】考查被动语态的用法。句意：这首歌被播放的时候，使我想起了我的学生时代。it作play的承受者，故用被动语态。例题解析4.—Haveyoufinishedyourproject?—Notyet.I’llfinishitifI_______tenmoreminutes.A.giveB.amgivenC.willgiveD.willbegiven答案：B【解析】考查动词的被动语态。句意“如果再给我十分钟我会完成它。”主语与动词give之间是被动关系，在条件状语从句中用一般现在时表将来。例题解析5.—Ifwetakeashowerinsteadofbath,morewater________.—Iagreewithyou.A.hassavedB.cansaveC.canbesaved答案：C【解析】考查被动语态。句意：——如果我们用淋浴而不是在浴缸里洗澡的话，会节省更多的水。——我赞同你。情态动词的被动语态的构成是：情态动词+be+动词的过去分词。例题解析6.翻译下列句子。1.需要好好地教育青少年。_____________________________________2.这辆小汽车不能修了。____________________________________3.这封信必须现在寄出去吗？____________________________________4.会议应该在哪举行？_____________________________________Teenagersneedtobeeducatedwell.Thiscarcan’tberepaired.Mustthisletterbeposte