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定语从句关系词关系词先行词从句成分例句备注关系代词who人主语Doyouknowthemanwhoistalkingwithyourmother?whom,which和that在从句中做宾语时，常可以省略，但介词提前时后面关系代词不能省略，也不可以用thatwhom人宾语Mr.SmithisthepersonwithwhomIamworkingTheboy(whom)sheloveddiedinthewar..whose人，物定语Ilikethosebookswhosetopicsareabouthistory.Theboywhosefatherworksabroadismydeskmate.that人，物主语宾语Aplaneisamachinethatcanfly.Sheisthepopstar(that)Iwanttoseeverymuch.which物主语宾语Thebook(which)Igaveyouwasworth$10.Thepicturewhichwasabouttheaccidentwasterrible.as人，物主语宾语Heissuchapersonasisrespectedbyallofus.ThisisthesamepenasIlostyesterday.as做宾语一般不省略关系副词when时间时间状语Iwillneverforgetthedaywhenwemetthere.可用onwhichwhere地点地点状语ThisisthehousewhereIwasborn.可用inwhichwhy原因原因状语Ican’timaginethereasonwhyheturneddownmyoffer.可用forwhich