Period Three　Grammar-Revise the Attributive Clause (non­restrictive)

课文原句感知

1．Xie Lei，who is 21 years old，has come to our university to study for a business qualification.

2．She is halfway through the preparation year，which most foreign students complete before applying for a degree course.

3．"You have to get used to a whole new way of life，which can take up all your concentration in the beginning，"explained Xie Lei, who had lived all her life in the same city in China.

4．Living with host families，in which there may be other college students，gives her the chance to learn more about the new culture.

5．He wanted to know what I thought，which confused me because I thought that the author of the article knew far more than I did.

一、非限制性定语从句的用法

　　非限制性定语从句与先行词的关系不十分密切，只是起补充说明的作用，缺少也不会影响全句的理解。在非限制性定语从句的前面往往有逗号与主句隔开，若将非限制性定语从句放在句子中间，前后都需要用逗号隔开。常见的引导词有：who，whom，which，as，whose，when，where。注意：that，why不用来引导非限制性定语从句。

The sun，which rises in the east，gives us heat and light.

太阳从东方升起，带给我们光和热。

二、非限制性定语从句应注意的问题

1．关系代词as和which

(1)关系代词as和which既可引导限制性定语从句，也可引导非限制性定语从句。as在从句中作主语或宾语，as引导的非限制性定语从句，既可在主句前，又可在主句后，有时还可插入主句中；而which引导的非限制性定语从句只能置于主句之后。相同的是两者都可指代主句的整个内容。

As is known to everybody，the moon travels around the earth.众所周知，月亮绕着地球转。

The weather turned out to be very good，which was more than we could expect.