Unit7Teenagersshouldbeallowedtochoosetheirownclothes.Talkwithyourclassmatesaboutyourschoolrulesbyusing“studentsarenotallowedto…”.SchoolrulesDon’tarrivelateforschool.=Studentsarenotallowedtoarrivelateforschool.Don’truninthehallways.Schoolrules=Studentsarenotallowedtoruninthehallways.SchoolrulesDon’teatintheclassroom.=Studentsarenotallowedtoeatintheclassroom.SchoolrulesDon’tlistentomusicintheclassroom.=Studentsarenotallowedtolistentomusicintheclassroom.SchoolrulesDon’tfightwithothers.=Studentsarenotallowedtofightwithothers.Schoolrules=Studentsarenotallowedtocheat.Don’tcheat.SchoolrulesDon’twearlonghair.(boys)=Boysarenotallowedtowearlonghair.Schoolrules=Studentsarenotallowedtosleepinclass.Don’tsleepinclass.Idon’tthinksixteen-year-oldsIagree.Theyaren’tshouldbeallowedtodrive.seriousenough.DoyouthinkteenagersshouldbeNo,Idon’tagreewithencouragedtomaketheirownthis.Teenagersaretoodecisions?youngtomaketheirowndecisions.TeenagersshouldnotbeallowedIdisagree.Theycanlearntohavepart-timejobs.alotfromworking.DoyouthinkwemaybeallowedIfyoudon’tuseaflash,totakesomephotosifwedon’tthenitmaybeOK.useaflash?GrammarFocus一般现在时的被动语态在英语中，动词有两种语态，即主动语态和被动语态。被动语态的基本结构是“助动词be+及物动词的过去分词”，其中助动词be有人称、数和时态的变化,其变化规则与be作为连系动完全一样。1.一般现在时被动语态的各种句式结构肯定式主语+am/is/are+过去分词（+by…)否定式主语+am/is/are+not+过去分词(+by…)疑问式Am/Is/Are+主语+过去分词(+by…)?特殊疑问词+am/is/are+主语+过去分词（+by...)?被动不离“be”“p.p.”,“p.p.”前面助动be。主谓一致莫忘记，am,is,are现在时。2.一般现在时被动语态的基本用法用法示例表示经常性或习惯性发生的被动动作Iamoftenaskedthequestionbymypupils.表示近期正在发生的被动动作ThesedayspeoplearemovedbyateachernamedZhangLili.描述某种常态化的被动的客观事实Thespaceshipismainlycontrolledbycomputer.强调目前存在的针对行为主体人的被限制性动作Youaren’tallowedtotakephotos.3.主动语态变为被动语态的方法第一步:将主动语态的宾语改为被动语态的主语；第二步:将主动语态的谓语改为“be+及物动词的过去分词”结构；第三步:将主动语态的主语改为介词by的宾语，放在谓语之后(有时可省略)。如图示：They(主语）grow(谓语）tea(宾语）inthesouth-eastofChina.被动语态:主动语态:Tea(主语）isgrown(谓语）bytheminthesouth-eastofChina.句式结构示例肯定句主语+情态动词+be+及物动词的过去分词(+by…)Teenagersshouldbeallowedtogoshopping.否定句主语+情态动词+not+be+及物动词的过去分词(+by…)Thewordcan’tbeusedinthissentence.一般疑问句情态动词+主语+be+及物动词的过去分词(+by…)?Musttheworkbefinishedtoday?特殊疑问句特殊疑问词+被动语态的一般疑问句？Whoshouldbeaskedforhelp?含有情态动词的主动句变为被动句时，谓语动词部分改为“情态动词+be+及物动词的过去分词”。WecanwriteLetterscanbewrittenlettersinEnglish.inEnglishbyus.改为被动语态4aRewritethesentencesaccordingtotheexample.1.Youmustcleanyourbedroomeveryday.Yourbedroommustbecleanedeveryday.2.Parentsshouldencourageteenagerstodosocialworkfortheircommunity.Teenagers__________________________________________________________.shouldbeencouragedtodosocialworkfortheircommunit3.CanLucydoherhomeworktomorrowinstead?Can__________________________________________________________________?Lucy’shomeworkbedonebyhertomorrowinstead4.DoyouthinkwemustkeepteenagersawayfromtheInternet?Doyouthinkteenagers_________________________________________?mustbekeptawayfromtheInternet5.Parentsshouldgivetee...
