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1、关系代词在定语从句中的用法一、判断定语从句引导词的一般规律：1）who，whom，that用来指人，who，that在从句中作主语或宾语，作主语时不能省，做宾语时可以省，whom只能做宾语，也可以省。eg:Ilovesingerswho/thatwritetheirownlyrics.（作主语）Theman（who/whom/that）youwanttomeethascome.你要见的人来了。（作宾语）Themanwho/thatgaveusatalkonscienceyesterdayisafamousscientist.（
2、作主语）Sheistheoldwoman（whom/that/who）Isawthismorning.（作宾语）2）whose既可用来指代人也可用来指代事物，一般置于名词前,在从句中充当定语。eg:Thisisthegirlwhosemathbookislost.这就是丢了数学书的女孩。（指人，作定语）Thehousewhosewindowsareclosedismine.窗户都关着的这栋房子就是我家。（指物，作定语）3）which，that用来指代事物，在从句中作主语或宾语。eg:Theyplantedthetreeswhi
3、ch/thatdidn’tneedmuchwater.（指物，作主语）Thefish(which/that)weboughtwerenotfresh.（指物，作宾语）Thetrainwhich/thathasjustleftisforShanghai.（指物，作主语）Thenoodles（which/that）Icookedweredelicious.（指物，作宾语）二、注意在下面几种情况下必须用that而不用which引导定语从句：①先行词是不定代词all,few,little,much,something,nothing,
4、anything等。eg：Allthatwehavetodoistopractiseeveryday.Hewon’ttellyouanythingthathehasheardaboutit.②先行词被all,any,every,each,few,little,no,some等修饰。eg：Ihavereadallthebooks(that)yougaveme.Youcantakeanytoythatyoulike.你可以拿走你喜欢的任何玩具。③先行词被序数词或形容词最高级所修饰。eg：ThefirstlessonthatIlea
5、rnedwillneverbeforgotten.ThisisthebestfilmI’veeverseen.④先行词被theonly,thevery,thesame,thelast修饰时，eg：Theonlylanguagethat iseasytolearnisthemothertongue. ⑤先行词既有人又有物时，eg：Theytalkedofthingsandpersonsthattheyremembered.⑥.由who或which提问的句子；eg:Whichisthehousethatcaughtfireyest
6、erday?昨天失火的是那座房子？Whoisthemanthatisreadingthebookoverthere?（作主语）三、通常使用which,不用that的场合：1.介词提到关系代词前时，如forwhich,onwhich,inwhich,ofwhich等；eg:DongguanistheplaceinwhichIwasborn. 2.先行词是that时。eg:Whatisthatwhichyouareholdinginyourhands?四、用whom而不用who的情况:介词提到关系代词前时eg:Sheisthegi
7、rlwithwhomIwentthere.ThepersontowhomyoujusttalkedisMr.Li.ThisistheboybehindwhomIsit.五、who，that在很多情况下可以通用，但是有些情况只能用who:1.先行词是one,ones,anyone的时候宜用who.Don’ttellanyoneaboutthenewswhooughtn’ttoknowit.2.先行词为those的时候，宜用who为关系代词Thosewhomadenomistakesintoday’sexercisesplease
8、raiseyourhands.3.在therebe开头的句子中:Thereisanoldmanwhowantstoseeyou.六、限制性定语从句与非限制定语从句:①限定性定语从句是句中不可缺少的组成部分，主句和从句之间不用逗号分开，引导非限定性定语从句的关系代词有who,w
