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在句中修饰名词或代词的成分叫定语。
They are talking about a maths problem.
It is very near from here to his school.
The man upstairs is a professor of Shandong
University.
The picture on the wall was drawn by my daughter.
1.引导非限制性定语从句时。
Football,which is an interesting game, is very popular all over the world
足球是一项有趣的运动，在全世界非常受欢迎。
2.当关系代词前有介词时。
This is the house in which Mo Yan once lived
这就是莫言曾经住过的房子。
He is one of the students who have a good command of French.他是精通法语的学生之ー。( the students为先行词)
He is the only one of the students who has a good command of French.他是学生中唯一精通法语的。( the only one为 先行词)
as既可指人也可指物。在定语从句中可作主语、宾语或表语。它常用在 the same…as，such，as.等结构中as不能省略。
as引导非限制性定语从句，代替整个主句的内容。从句可放在主句前、主句后或主句中间。
As you know, she is a stubborn girl, and I can’t persuade her to change her mind.
