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　　定语从句的关系代词 Which的用法: 若先行词指物则代替先行词在定语从句中充当主语或宾语.This is the pen which was given by my friend.先行词 指物代替先行词在定语从句中充当主语This is the pen which my friend gave to me.先行词 指物代替先行词在定语从句中充当宾语定语从句的关系代词 that的用法: 若先行词指人或物则代替先行词在定语从句中充当主语或宾语The animal that which is lost is a panda.先行词 指物代替先行词在定语从句中充当主语She is the person that who we are worried about.先行词 指人代替先行词在定语从句中充当宾语注意1 that which在代物时常常可以通用,但有时只宜于用which ,不用that(1) 关系代词前有介词时.This is the hotel in which you will stay.(2) 如有两个定语从句,其中一句的关系代词是that,另一句宜于用which.Let me show you the novel that I borrowed from the liberary which was newly open (新开放) to us.注意2that which在代物时常常可以通用,但有时只宜于用that ,不用which.(1) 先行词是形容词最高级或者它的前面有形容词最高级时This is the best that has been used against air pollution(反对空气污染) in cities.English is the most difficult subject that you will learn during these years.(2) 先行词是序数词,或它的前面有一个序数词时He is the last person that I want to see.(3) 主句中已有疑问词时Which is the bike that you lost?(4) 先行词既有人又有物时The bike and its rider that had run over (撞倒了)an old man were taken to the police station.(5) 先行词是all,much,little,something,everything,anything,nothing,none,the one等代词时You should hand in all that you have.We haven’t got much that we can offer you.I mean the one that you talked about just now.(6) 先行词前面有only,any,few,little,no,all,one of,the same,the very等词修饰时The only thing that we can do is to give you some money.Li Ming is the only one that got full marks (满分)in our class.Li Ming is one of the students that want to be teachers in our class.(7) 有两个定语从句,其中一个关系代词已用which,另外一个宜用thatEdison built up a factory(办了一个工厂) which produced things that had never been seen before。