定语从句的关系代词that不是万能的.具体的的用法: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

　　Theanimalthatwhichislostisapanda.

　　先行词指物代替先行词在定语从句中充当主语

　　Sheisthepersonthatwhoweareworriedabout.

　　先行词指人代替先行词在定语从句中充当宾语

　　注意1thatwhich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.

　　Thisisthehotelinwhichyouwillstay.

　　(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.

　　LetmeshowyouthenovelthatIborrowedfromtheliberarywhichwasnewlyopen(新开放)tous.

　　注意2thatwhich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

　　Thisisthebestthathasbeenusedagainstairpollution(反对空气污染)incities.

　　Englishisthemostdifficultsubjectthatyouwilllearnduringtheseyears.

　　(2)先行词是序数词,或它的前面有一个序数词时

　　HeisthelastpersonthatIwanttosee.

　　(3)主句中已有疑问词时

　　Whichisthebikethatyoulost?

　　(4)先行词既有人又有物时

　　Thebikeanditsriderthathadrunover(撞倒了)anoldmanweretakentothepolicestation.

　　(5)先行词是all,much,little,something,everything,anything,nothing,none,theone等代词时

　　Youshouldhandinallthatyouhave.

　　Wehaven’tgotmuchthatwecanofferyou.

　　Imeantheonethatyoutalkedaboutjustnow.

　　(6)先行词前面有only,any,few,little,no,all,oneof,thesame,thevery等词修饰时

　　Theonlythingthatwecandoistogiveyousomemoney.

　　LiMingistheonlyonethatgotfullmarks(满分)inourclass.

　　LiMingisoneofthestudentsthatwanttobeteachersinourclass.

　　(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that

　　Edisonbuiltupafactory(办了一个工厂)whichproducedthingsthathadneverbeenseenbefore.

　　定语从句的关系副词Where的用法:若先行词指地点且其在定语从句中充当地点状语.

　　Thisisthehouse+Iwasborninthehouse.(=Iwasbornthere)

　　介词短语副词

　　=ThisisthehousewhereIwasborn.这就是我在那儿出生的房子.

　　先行词关系副词

　　inwhichIwasborn.

　　介词+关系代词

　　whichIwasbornin.

　　关系代词

　　这里作介宾的which和that可以省略

　　thatIwasbornin

　　关系代词.