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定语从句用作定语的从句叫定语从句。定语从句所修饰的名（代）词叫作先行词。引导定语从句的词叫“关系词”。关系词有两个作用：一、引导定语从句。二、代替先行词在其引导的定语从句中充当一定的句子成分。定语从句一般紧跟在先行词的后面。1.Thestudents(whodon’tstudyhard)willnotpasstheexam.主句:Thestudentswillnotpasstheexam.先行词定语从句2.Thewoman(whomyousawinthepark)isourEnglishteacher.先行词定语从句主句:ThewomanisourEnglishteacher.从句的主语：从句的宾语：youwhom3.Ashoeshopisashop(whichsellsshoes).主句：Ashoeshopisashop.从句的主语:which4.Thebook(thatyouwant)isonthedesk.主句从句的主语:从句的宾语：Thebookisonthedesk.youthat注意:必须保持主句的完整性引导定语从句的关系代词常见的有that,which,whowhom等。关系代词放在先行词和定语从句之间，起连接作用，同时又作定语从句的一个成份。eg.Theman(that/whotoldusafunnystory)isinthenextroom.主语Ilostthebook((that/which)yougaveme).宾语指代所做成分是否可省略that人；物主语；宾语作宾语可省which物主语；宾语作宾语可省who人主语；宾语作宾语可省whom人宾语可省whose人；物定语不可省关系代词的用法关系词指代所做成分which物subject（主语）object（宾语）that人物who人whom人object（宾语）whose人/物attribute（定语）Fillintheblankswith:who,whom,whose,which,thatAclockisamachine______________tellpeoplethetime.that/whichAnurseisaperson_________looksaftersickpeople.who/thatHeistheman_______________Imetintheparkyesterday.(whom/who/that)MrBlack________workisteachingEnglishisregardedasthebestteacherintheschool.whose定语从句：是指在复合句中，修饰或的从句.被定语从句所修饰的名词或代词叫做“”.引导定语从句的词叫“”名词代词先行词关系词引导定语从句的关系词指代人指代事物所属关系指地点指时间指原因who，whom，thatwhich，thatwhose，ofwhichwherewhenwhy关系代词关系副词定语从句分限制性定语从句和非限制性定语从句。非限制性定语从句的先行词和关系词常用逗号隔开，且不能用that引导。e.g.1、Shehadeightchildren,threeofwhomlivedtogrowup.2、Smoking,whichisabadhabit,isverypopular.单项选择1.Theman_____youjusttalkedtowasafriendofmine.A.whomB.whichD.whoseD.where2.Thenecklace____myfatherboughtmeisveryexpensive.A.whoB.whoseC.thatD.where3.Thedoctor____isleavingforAfricanextmonth.A.thenurseistalkingtohimB.whomthenurseistalkingtoC.thenurseistalkingtoD.thatthenurseistalkingACB4.Ms.Ji____lovesusverymuchisourmathteacher.A.whoB.whomC.whoseD.which5.Thebike________wasstolen.A.whichmymotherbuysmeB.whomymotherboughtmeC.whichmymotherboughtmeD.thatmymotherbuysme6.Thedog___ownerisanoldmanisverylovely.A.whichB.whoseC.thatD.whoACB