1.　 I saw the man. He closed the door

　　I saw the man who (that) closed the door

　　2.　 The girl is happy She won the race

　　The girl who won the race is happy

　　3.　 The students are from China They sit in the front row

　　The students who sit in the front row are from China

　　(要注意的是先行词是 students 则 who 的数也应看作复数。)

　　4.　 We are studying sentences They contain adjective dause

　　We are studying sentences that (which) contain adjective dause

　　5.　 The taxi driver was friendly He took me to the airport

　　The taxi driver who took me to the airport was friendly

　　6.　 The book was good I read it

　　The book that I read was good

　　The book I read was good

　　7.　 The people were very nice We visited them yesterday

　　The people we visited yesterday were very nice

　　8.　 The man called the police His wallet was stolen

　　The man whose wallet was stolen called the police

　　9.　 I come from a country Its history goes back thousands of years

　　I come from a country whose history goes back thousands of years

　　10.　 I have to call the man I picked up his umbrella after the meeting

　　I have to call the man whose umbrella I picked up after the meeting

　　关系代词 whom， which 在定语从句中作介词宾语时，可以和介词一起放于先行词与定语从句之间，有时为了关系紧凑也可以将 whom 与 which 与先行词紧挨着书写，而将介词置于定语从句的后面，如：

　　That was the room in which we had lived for ten years 或可以写作：

　　That was the room which we had lived in for ten years

　　He was the man whom(who) you were looking for 要注意的是此句的关系代词 whom 可以用主格取代，而 look for 是短语动词也不可将 for 放于定语从句之前。that 作关系代词作介词宾语时，不能紧跟介词，而只能将介词置于定语从句的后面。如： The man that we were talking about has come to our school 这时不可用 about that … 请看下面例句：

　　1.　 The meeting was interesting I went to it

　　The meeting that I went to was interesting

　　2.　 The man was very kind I talked to him yesterday

　　The man who I talked to yesterday was very kind

　　3.　 I must thank the people I got a present from him

　　I must thank the people who I got a present from

　　4.　 The picture was beautiful She was looking at it

　　The picture that (which) she was looking at was beautiful

　　5.　 The man is standing over there I told you about him

　　The man who I told you about is standing over there