2015年卫生类职称英语备考语法知识（5）
2015-01-27 09:02 来源：医学教育网
卫生类职称英语备考语法知识：限制性和非限制性定语从句
例如：
1)This is the house which we bought last month.（限制性)
The house,which we bought last month,is very nice.（非限制性)
2)当先行词是专有名词或物主代词和指示代词所修饰时，其后的定语从句通常是非限制性的，例如：
Charles Smith,who was my former teacher,retired last year.
My house,which I bought last year,has got a lovely garden.
This novel,which I have read three times,is very touching.
3)非限制性定语从句还能将整个主句作为先行词,对其进行修饰,这时从句谓语动词要用第三人称单数，例如：
He seems not to have grasped what I meant,which greatly upsets me.
Liquid water changes to vapor,which is called evaporation.
说明：关系代词that和关系副词why不能引导非限制性定语从句。
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