2.被动语态常用于表达事实的客观性

tip: 英文的表达方式重点在于突出客观事实，故常用被动语态；而中文则善于运用动作的执行者,常用主动式

被动语态的特殊结构：被动语态＋现在分词

e.g. puma fur was found clinging to bushes 现在分词clinging起补充说明主语的作用

3，定语从句和同位语从句

一般来讲, 定语从句和同位语从句紧随在被修饰名词后面，但为了保持句子平衡，也可把谓语动词放到从句之前。让我们来看两个文中的例子：

(1)Pumas are large, cat-like animals which are found in America.

(2)Reports came into London Zoo that a wild puma had been spotted forty-five miles south of London.

现在让我们来回顾下两种从句的区别：

(1) 定语从句只是对于被修饰词的补充说明、修饰。

定语从句的引导词：

指人：主语 who; 宾语 who/whom; 定语 whose

表达事物：that(也可指人)/ which

时间状语：when; 地点状语：where; 原因状语： why

(2) 同位语从句则是讲述被修饰名词的内容

同位语从句的引导词：

名词做主语、宾语时，关系词用that 而不是which

时间 when; 地点 where

e.g. I have no idea what has happened to him.

大家学的怎么样？我们来测试一下吧

Exercises

1.choice questions

(1) What particular piece of evidence persuaded the experts that a puma had been seen in the village?

a. The puma had not attacked the woman.

b. The woman had described the animal she had seen as ‘a large cat'.

c. A puma had come very close to a human being.新概念英语第二册答案

d. The puma had behaved like a cat.

(2) The accumulating evidence made the expertsthe animal was a puma.

a. to think

b. thinking

c. think

d. thought

(3)it immediately ran away.

a. Observing her

b. On being observed

c. Having been observed

d. On her being observed

2.translation

（4）一想到考试失利，我心里就很不安。

（5）她突然想到也许她可以用另一种方法来做实验。

（6）她坚信丈夫会回来。

（7）我们需要找一个可靠的人。

（8）伤员所到之处，都留下道道血迹。

（9）熊猫是一种体形像猫的大动物，产于亚洲。

（10）However, as the evidence began to accumulate, experts from the Zoo felt obliged to investigate, for the descriptions given by people who claimed to have seen the puma were extraordinarily similar.

3.Writing

（11）Summarize the story within 3 sentences.(You can also use one complex sentence to summarize.)