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1、定语从句一.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。一.定语从句的基本定义eg.TheboywhoisreadingisTom.先行词关系代词Hospitalisaplacewhereadoctorworks.先行词关系副词Jointhefollowingsentences:Aplaneisamachine.Themachinecanfly.Aplaneiscanfly.关系代词的实质themachineamachinethat/whichTheladyisGreen.Wesawheryesterd
2、ay.TheladyisGreenWho/that关系代词实际上代替的就是先行词herwesawyesterday1.Theboyismybrother.2.Theboyisplayingfootball.3.Ilikereadingbooks.4.ThesebookswerewrittenbyLuXun.5.Menciuswroteabook.6.Manypeoplehavereadit.二.关系词的分类关系代词2.关系副词关系代词在定语从句中作主语、宾语、表语和定语，常用的关系代词有：that,which,who,whom,whose关系副词在定语从句中作状语，常用的关系副词有：
3、when,where,why二.关系词的分类三.关系代词的基本用法和注意点1.关系代词的基本用法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.who,whom③which指物，在定语从句中作主语
4、或宾语。作宾语时，可省略。Thesearethetreeswhichwereplantedlastyear.Thisrecorder（which）heisusingismadeinJapan.whichHeistheman(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.that⑤whose指人或物,在定语从句中作定语。不可省略。Weliveinahousewhosewindowsfacesouth.Thisisthelittlegirlwhoseparentswerekill
5、edinthegreatearthquake.whose2.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：ThisisallthatIwantfromtheschool.④当先行词被最高级修饰时。如：TheTVtoweristhehighestb
6、uildingthathasbeenbuiltinthiscity.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。(2)用who不用that的情况①先行词为all,anyone,one,ones等时。如：Allwhoheardthenewswereexcited.②先行词为those,
7、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
