指人，在从句中做主语（1）TheboyswhoareplayingfootballarefromClassOne.（2）YesterdayIhelpedanoldmanwholosthisway.指人，在定语从句中充当宾语，常可省略。（1）Mr.Liuistheperson（whom）youtalkedabout.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。（2）Themanwho/whomyoumetjustnowismyfriend.指物，在定语从句中做主语或者宾语，做宾语时可省略（1）Footballisagamewhichislikedbymostboys.（which 在句子中做主语）（2）Thisisthepen（which）heboughtyesterday.（which 在句子中做宾语）指人时，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。（1）Thepeoplethat/whocometovisitthecityareallhere.（在句子中做主语）（2）Whereisthemanthat/whomIsawthismorning?（在句子中做宾语）通常指人，也可指物，在定语从句中做定语（1）hehasafriendwhosefatherisadoctor.（2）Ioncelivedinahousewhoseroofhasfallenin.whose 指物时，常用以下结构来代替（3）theclassroomwhosedoorisbrokenwillsoonberepaired.（4）theclassroomthedoorofwhichisbrokenwillsoonberepaired.（5）doyoulikethebookwhosecoverisyellow?（6）doyoulikethebookthecolorofwhichisyellow?二、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.、:I-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）（1）thisisthewatchwhich/thatiamlookingfor.（turth）（2）thisisthewatchforwhichiamlooking.（false）2.若介词放在关系代词前，关系代词指人时用 whom，不可用 who 或者 that；指物时用 which,不能用 that；(1)themanwithwhomyoutalkedismyfriend.(t)(2)themanwho/thatyoutalkedwithismyfriend.(f)(3)theplaneinwhichweflewtocanadaisverycomfortable.(t)(4)theplaneinthatweflewintocanadaisverycomfortable.(f)3.“介词+关系代词”前可有 some,any,none,both,...
