that、who、which引导的定语从句

1定语从句------关系代词1.who指人，在从句中做主语(1)TheboyswhoareplayingfootballarefromClassOne.(2)YesterdayIhelpedanoldmanwholosthisway.2.whom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。(3)Themanwho/whomyoumetjustnowismyfriend.3.which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)4.that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。(5)Thepeoplethat/whocometovisitthecityareallhere.(在句子中做主语)(6)Whereisthemanthat/whomIsawthismorning?(在句子中做宾语)5.whose通常指人，也可指物，在定语从句中做定语(1)Hehasafriendwhosefatherisadoctor.(2)Ilivedinahousewhoseroofhasfallenin.whose指物时，常用以下结构来代替(3)Theclassroomwhosedoorisbrokenwillsoonberepaired.=Theclassroomthedoorofwhichisbrokenwillsoonberepaired.(5)Doyoulikethebookwhosecolorisyellow?=Doyoulikethebookthecolorofwhichisyellow?