Unit4Teenagersshouldbeallowedtochoosetheirownclothes被动语态语态：表示主语和谓语动词之间的关系。语态：表示主语和谓语动词之间的关系。英语有两种语态，即主动语态和被动语态。英语有两种语态，即主动语态和被动语态。主动语态：表示主语是动作的执行者。被动语态：表示主语是动作的承受者。如：ManystudentsstudyEnglish.(主动语态)Englishisstudiedbymanystudents.语态语态被动语态的结构助动词be+过去分词(be+done)bymanystudents.1.ManystudentsstudyEnglish.Englishisstudied2.Theymakeshoesinthatfactory.Shoesaremadebytheminthatfactory.1.一般现在时的被动语态结构：is/are+过去分词•TheyplayfootballonSunday.•Lucydoesthehomeworkintheevening.•Theyoftenusecomputersinclass.•WemakethesemachinesinBeijing.FootballisplayedbythemonSunday.ThehomeworkisdonebyLucyintheevening.Computersareoftenusedbytheminclass.ThesemachinesaremadeinBeijing.1.Theyboughtacomputerlastterm．bythemlastterm.2.一般过去时的被动语态结构：was/were+过去分词lastyear.2.Weplantedmanytreeslastyear.2.Weplantedmanytreeslastyear.ManytreeswereplantedAcomputerwasbought•Theybuiltthetallbuildinglastyear.•Hetookgoodcareofhislittlebrotheryesterday.•Wecleanedourclassroomjustnow.•Theyusedtheroomsforresting.Thetallbuildingwasbuiltbythemlastyear.Hislittlebrotherwastakengoodcareofbyhimyesterday.Ourclassroomwascleanedbyusjustnow.Theroomswereusedforrestingbythem.3.一般将来时的被动语态结构：begoingtobe/willbe+过去分词1.Theywillfinishtheworkintendays.bythemintendays.Theworkwillbefinished2.Tomisgoingtocleantheroomtomorrow.TheroomisgoingtobecleanedbyTomtomorrow.•Wewillholdasportsmeetingnextweek.•Childrenwilltakesomephotosintheschoolyardtomorrow.Theheadmasterisgoingtogiveatalkthisafternoon.Asportsmeetingwillbeheldbyusnextweek.Somephotoswillbetakenbychildrenintheschooltomorrow.Atalkisgoingtobegivenbytheheadmasterthisafternoon.4.含有情态动词的被动语态结构：can/may/must/should+be+过去分词1.AmycantakegoodcareofGina．byAmy.Ginacanbetakengoodcareof2.Youshoulddrinkmorewater.2.Youshoulddrinkmorewater.MorewaterMorewatershouldbedrunkshouldbedrunkbyyou.byyou.1...
