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?
除关系代词外，还有关系副词， when， where， why， 其中 when用来指时间，在定语从句中作时间状语。如： I never forget the day when I first came to the Great Wall? 而 where 则指地点，如： This is the house where the old man lives? 请看下面例句：
1． The city was beautiful? We spent our vacation there?
The city where we spent our vacation was beautiful?
2． That is the restaurant? I will meet you there?
That is the restaurant where I will meet you?
3． The town is small? I grew up there?
The town where I grew up is small?
4． That is the drawer? I keep my newpapers there?
That is the drawer where I keep my newspapers?
5． Monday is the day? We will come then?
Monday is the day? When we will came?
6． ７∶０５ is the time My plane arrives then?
７∶０５ is the time when my plane arrives?
7． １９６０ is the year? The revolution took place then?
１９６０ is the year when the revolution took place?
8． July is the month? The weather is usually the hottest then?
July is the month when the weather is usually the hottest?
在定语从句中又可分为两大类定语从句，即限制性定语从句和非限制性定语从句。
① 限制性定语从句是先行词在意义上不可缺少的定语，如果去掉的话，主句的意思就不完整，意义就表述不明。这种句型一般定语从句紧接先行词，如： I was the only person in my office who was invited?
② 非限制性定语从句。它与主句的关系不十分密切，只是对其附加说明，也就是讲即便去掉定语从句，句意也不受影响，仍然清晰明了。这样的定语从句要在它和 主句之间加一逗号分开。且关系代词不引导这种非限制性定语从句，如： Abraham Lincoln， who led the United States through these years， was shot on April １４， １８６５ at a theatre in washington? Ｄ． Ｃ． 又如：Galileo lived in the city of Pisa， where there is a leaning tower about 180 feet high?
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