①非限制性定语从句用which，不用that引导。
如： Football，which is a very interesting game，is played all over the world．
He changed his mind, which made me angry.
She is an artist，which I am not.
②先行词为that时，为了避免重 复，定语从句用which不用that引导。
如： That which you borrowed from me wasn't a real diamond necklace．
Let me show you the novel that I borrowed from the library which was newly open to us.
③介词后用which不用that引导。
如： The method with which you solved the problem is very good．
This is the one of which I'm speaking./This is the one I'm speaking of.
Bejing is the place in which I was born.
