He rushed to help the man his car was trapped in the mud.his---whose,whose 引导定语从句
All which ia need ia supply of oil.　　　　　　　which改为that,all 作先行词,引导词只能用that
This is the best film which I have seen this year.which改为that,先行词有最高级best修饰
The cake you made it yesterday was very delicious.　去掉it,you made 为cake 的定语从句
Do you know the man worte the letter?wrote改为writing,writhg the letter 为the man的后置定语
Who is the great man who saved my boy?第二个who 改为that,　who引导的疑问句定语从句引导词只能用that
Here are the patients after whom you will look.
This is all the money with that he can buy a Christmas present for his mother.that改为which,介词后引导词只能用whichHere are the patients after whom you will look.The girl which ia standing next to our teacher ia her daughter.这两句那会给你加悬赏很感谢The girl which ia standing next to our teacher ia her daughter. which改为　who ,先行词为人Here are the patients after whom you will look.　after 回到　look后面，look after 为动介型词组，不能拆开