一.定语从句的基本定义放在名词或代词后面，由关系代词或关系副词引导的修饰该名词或代词的从句叫定语从句。被修饰的名词或代词叫先行词。Jointhefollowingsentences:Aplaneisamachine.Themachinecanfly.Aplaneiscanfly.定语从句的构成themachineamachinethat/whichTheladyisGreen.Wesawheryesterday.herTheladywesawyesterdayisGreenWho/that关系代词实际上代替的就是先行词eg.TheboywhoisreadingisTom.先行词关系代词引导的定语从句Hospitalisaplacewhereadoctorworks.先行词关系副词引导的定语从句二、先行词和关系词的关系1.Aplaneisamachinethatcanfly.2.TheboywhobrokethewindowiscalledTom.3.Theboywhoseparentsaredeadwasbroughtupbyhisgrandfather.4.TheschoolwhereIstudyisfarfrommyhome.themachine=thattheboy=whotheboy’s=whoseintheschool=where关系代词实际上是先行词的复指关系词whose实际上是先行词的所有格关系副词实际上是介词＋先行词三、关系词的分类关系代词指代的先行词充当从句的成分who人主语、宾语whom人宾语which物主语、宾语that人或物主语、宾语、表语whose人或物定语关系副词when时间时间状语where地点地点状语why原因原因状语①who指人,在定语从句中作主语或宾语。作宾语时，可省略。Theman(who)Italkedwithisourteacher.Apersonwhostealsthingsiscalledathief.②whom指人,在定语从句中作宾语，可省略。Theman(whom)InoddedtoisMr.Li.（一）关系代词的用法③which指物，在定语从句中作主语或宾语。作宾语时，可省略。Thesearethetreeswhichwereplantedlastyear.Thisrecorder（which）heisusingismadeinJapan.Heistheman(that)Itoldyouabout.④that指人或物，在定语从句中作主语或宾语。作宾语时，可省略。Aplaneisamachinethatcanfly.⑤whose指人或物,在定语从句中作定语。不可省略。Weliveinahousewhosewindowsfacesouth.Thisisthelittlegirlwhoseparentswerekilledintheearthquake.（二）关系代词的用法注意点(1)that和which都可以指物，但以下5种情况只能用that不能用which。①当先行词中有人又有物时。如：Doyouknowthethingsandpersonsthattheyaretalkingabout?②当先行词为不定代词all,one,few,little,no,some,any,everything,nothing,nobody,none等时。如：ThisisallthatIwanttoknow.④当先行词被最高级修饰时。如：TheTVtoweristhehighestbuildingthathasbeenbuiltinthiscity.⑤当先行词被序数词修饰时。如：ThefirstlessonthatIlearnedwillneverbeforgotten.③当先行词被only,just,very,right,last等修饰时。如：ThisistheverybookthatIamlookingforthesedays.(2)that和who都可以指人，但下面两种情况，多用who。①先行词为all,anyone,one,ones等时。如：Allwhoheardthenewswereexcited.②先行词为those,he和people时。如：Thosewhowanttogopleasesignyournameshere.HewhodoesnotreachtheGreatWallisnotatrueman.(3)whose引导的定语从句注意点①whose引导定语从句，其后应紧跟名词，构成名词短语。②whose与它所修饰的名词一起可以作介词的宾语。如：Thebossinwhosedepartmentheworkedhadheardthenews.他工作所在部门的老板已经听说了这个消息。④whose的先行词指物时，可用ofwhich代替，但语序不同，即whose+名词=the+名词+ofwhich，或=ofwhich+the+名词。如：Thenovelwhosetitle(=thetitleofwhich或ofwhichthetitle)isRedandBlackisveryinteresting.③whose引导的定语从句，其先行词既可以指人也可以指物。⑤whose的先行词指人时，可用ofwhom代替，但语序不同，即whose+名词=the+名词+ofwhom，或=ofwhom+the+名词。如：Theboywhosemother(=themotherofwhom或ofwhomthemother)isadoctorismyfriend.Thescientistwhowemetyesterdayisveryfamouswhomintheworld.that﹨(2)Thedressisnew.Sheiswearingit.Thedresswhichsheiswearingisnew.that﹨(1)Thescientistisveryfamousintheworld.Wemetheryesterday.巩固练习：1.用定语从句合并句子(3)Heisthekindperson.Ihaveeverworkedwithhim.(4)Thisisthebestfilm.Ihaveeverseenthisfilm.Heisthekindp...
