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