不用that，而用which，who，whom的情況 　　He made the same mistakes again ,whichmade his parents very angry. 　　Yesterday I bought a dictionary,whichcost me more than 100 yuan . 　　Mr Smith,whogave a talk several months ago,will come again. 　　My uncle has come back from abroad,whomIhaven’t met for along time. 　　在非限制性定語從句中，指事物用which，指人用who或whom。 　　Her bag ,inwhichshe put all her money,has been stolen. 　　This is the ring onwhichshe spent 1000 dollars. 　　Xiao Wang ,withwhichIwent to the concert, enjoy it very much. 　　在介詞后面，指事物用which，指人用whom。 　　Where引導(dǎo)的定語從句 　　先行詞是表示地點的名詞或含有地點意義的抽象名詞，用引導(dǎo)定語從句。從句做狀語。 　　This is the townwhere (= in which )Ispent my childhood. 　　The tablewhere (= at which )she is sitting is a new one. 　　I’ll show you the painytwhereyou failed. 　　注意1: 　　若定語從句缺主語或謂語，用which或that引導(dǎo)定語從句。 　　The librarywherestudents often study was on fire last night. 　　The library,whichwas built in the 1930s,needs repairing. 　　The librarywhichyou visited yesterday was built in 1990. 　　注意2:區(qū)分where引導(dǎo)的定語從句和狀語從句 　　Where前面有被修飾的地點名詞時，是定語從句，否則是狀語從句。 　　When you read books ,you had better make a mark at the spoytwhereyou have any questions. 　　When you read books , you had better make a markwhereyou have any questions.