2019学年度人教版选修7 Unit 5 Traveling abroadPeriod4Grammar学案

一限定性定语从句与非限定性定语从句

限定性定语从句是句中不可缺少的组成部分，主句和从句之间不用逗号隔开

非限定性定语从句是对主句先行词的补充说明，没有这种从句不影响主句意思完整.一般用逗号把主句和从句分开（引导词：who, whom, whose, which, of which, when, where等，不用that,不能省略）

试比较：

1. I was the only person in my office who was invited.

我是我们办公室唯一被邀请的人。

(如果把从句部分去掉, 整个句子的含义就变了),限定性定语从句

2. His dog, which was now very old, became ill and died.

他的狗当时很老了, 生病后就死了。

(去掉从句, 主句的意义仍然完整:他的狗生病死了。)非限定性定语从句

3. Yesterday I met Li Lei, who seemed to be very busy.

昨天我 碰上李雷了,他好像很忙。

(去掉从句, 意义仍然完整:昨天我碰上李雷了。)非限定性定语从句

二. 非限制性定语从句中的一些问题：

a. 非限制性定语从句中, 指物时, 用which而不用that。

1) Football, which is a very interesting game, is played all over the world.

2) All the books there, which have beautiful pictures in them, were written by him.

b. 指人时主格用who,宾格用whom,物主格用whose(也可指物)。

1） Miss Howe, whom you met in the library, is our new teacher.

3) Li Ming, who se mother has been ill for two days, is absent from school today.

c. 另外关系副词when(指时间), where (指地点)也可以引导非限制性定语从句(注意关系副词why不能引导非限制性定语从句)

1) He lives in the city, where there is a high tower.

2) The People's Republic of China was founded in 1949, when he was born

d. 介词加关系代词也可以引导非限定性定语从句。

1) Wu Dong, with whom I went to see the film, enjoyed it very much.

2) Her bag, in which she put all her b ooks, has not been found.

3) The story about the Long March, of which this is an example, are well written

三. as, which 非限定性定语从句

由as, which 引导的非限定性定语从句,as和which可代整个主句，相当于and this或and that。As一般放在句首,which在句中。

As we know, smoking is harmful to one's health.

The sun heats the earth, which is very important to us.

Exercises

1. Alice received an invitation from her boss, ___came as a surprise.

A. it　 B. that　 C. which　　D. he

2.The weather turned out to be very good, ___was more than we could expect.

A. what　 B. which