文档介绍：:修饰一个名词或代词的从句称为定语从句,一般紧跟在它所修饰的先行词后面。:引导定语从句的关联词成为关系词 关系词有关系代词和关系副词。关系代词有that,which,who,whom,whose,as 等; 关系副词有where,when,why等。 关系词常有3个作用:1,引导定语从句。2,代替先行词。3,在定语从句中担当一个成分。,在从句中做主语 (1)Theboyswhoareplayingfootballarefromclassone. (2),在定语从句中充当宾语,常可省略。 (1)(whom)youtalkedaboutonthebus. (2).   注意:关系代词whom在口语和非正式语体中常用who代替,可省略。 (3)Themanwho/,在定语从句中做主语或者宾语,做宾语时可省略 (1)footballisagamewhichislikedbymostboys. (2)Thisisthepen(which),相当于who或者whom;指物时,相当于which。在宾语从句中做主语或者宾语,做宾语时可省略。 (5)Thenumberofthepeoplethat/etovisitthecityeachyearrisesonemillion. (6)Whereisthemanthat/whomIsawthismorning?,也可指物,在定语从句中做定语 (1)Hehasafriendwhosefatherisadoctor. (2)+关系代词引导的定语从句    关系代词在定语从句中做介词宾语时,从句常由介词+关系代词引导 (1)theschool(that/which)heoncestudiedinisveryfamous. (2)theschoolinwhichheoncestudiedisveryfamous. (3)tomorrowiwillbringhereamagazine(that/which)youaskedfor. (4)tomorrowiwillbringhereamagazineforwhichyouasked. (5)we'llgotohearthefamoussinger(whom/that/who)wehaveoftentalkedabout. (6)we'llgotohearthefamoussingeraboutwhomwehaveoftentalked. 注意:1. 含有介词的动词短语一般不拆开使用,如:lookfor,lookafter,takecareof等 (1)thisisthewatchwhich/thatiamlookingfor.(t) (2)thisist