《Grammar and usage(2)： Relative pronouns：that, which, who, whom and who》优质课教案设计

《Grammar and usage(2)： Relative pronouns：that, which, who, whom and who》教案优质课下载

非限制性定语从句：

作用相当于一种插入语或者对先行词的一种解释，和先行词之间只有比较松散的关系，文字中常常用逗号将其与主句分开，用法其实与限制性定语从句极为相似，只是不能用that做修饰词。

例句：

This letter is from his parents, who are working in Tibet.

Englishi is an important subject, which every students should study well.

The building, in front of which sat a boy, was a school.

一、

定语从句有限制性和非限制性两种。限制性定语从句是先行词不可缺少的部分，去掉它主句意思往往不明确；非限制性定语从句是先行词的附加说明，去掉了也不会影响主句的意思，它与主句之间通常用逗号分开，例如：

This is the house which we bought last month. 这是我们上个月买的那幢房子。（限制性）

The house, which we bought last month, is very nice.这幢房子很漂亮，是我们上个月买的。（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. 查理·史密斯去年退休了，他曾经是我的老师。

My house, which I bought last year, has got a lovely garden. 我去年买的的那幢房子带着个漂亮的花园。

This novel, which I have read three times, is very touching. 这本小说很动人，我已经读了三遍。

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. 他似乎没抓住我的意思，这使我心烦。

Liquid water changes to vapor, which is called evaporation. 液态水变为蒸汽，这就叫做蒸发。

二、

从形式上看，限制性定语从句与其先行词紧紧相连，两者没有停顿；非限制性定语从句与先行词之间有逗号隔开。从意义上讲，限制性定语从句用来修饰先行词，两者密不可分；而非限制性定语从句仅仅对先行词作补充性叙述或说明，两者关系不那么紧密。由于两种定语从句存在着这些区别，一般来说，限制性定语从句多半译成汉语的前置定语，修饰其后的先行词，非限制性定语从句则往往译成后置的并列从句。that不能引导非限制性定语从句。通常对定语从句处理如下：

（1） 限制性定语从句译成前置定语

These neighborhoods frequently recreate much of the culture and the values of the nationality that makes up the majority of the population.

这些居民区经常再现构成大多数居民的大量民族文化和价值观念。

（2） 非限制性定语从句译成后置的并列分句

In almost all developing countries, economic development depends upon growth in export trade, which in turn creates jobs and raises living standards.

几乎所有的发展中国家经济的发展都依赖于出口贸易的增长，而出口的增长又有助于创造更多的就业机会和提高人民的生活水平。