i. as作连词引导时间状语从句，表示“当……的时候”

1. 主句的动作与从句的动作交替进行。意为“一边……一边”。

“I'll come to pick you up at 10,” he said as he left.

“我十点来接你。”他一边离开一边说。

As he walked, he sang and danced.

他边走边唱边跳。

2. 主句的动作发生在从句的动作进行的过程中。意为“当……时候”。

As he read a magazine, he fell asleep.

当他读杂志的时候，睡着了。

As I was walking on the street, I met with my old friend.

我在街道走的时候遇见了我的老朋友。

3. 主从句两个短动作同时发生，意为“就在这时”。

Just as I closed the door, I remembered the key.

就在我关门的时候，我想起了门钥匙。

He became quite surprised as he heard the news.

听到这个消息他很吃惊。

4. 后跟名词时，表示在名词表示的时间段中。

As a young man, he was a storekeeper and postmaster.

年轻的时候，他当过店主和邮局局长。

Even as a child, he began to make a living by himself.

甚至还是个孩子的时候，他就开始独自谋生了。

5. 主句的动作与从句的动作相伴发生，意为“随着……”。

We get wiser as we get older.

随着年龄增长我们更聪明了。

专项练习

1. As I _______ the newspaper, Granny _______ asleep.

A. read; was falling

B. was reading; fell

C. was reading; was falling

D. read; fell

2. Mother was worried because little Alice was ill, especially _______ father was away in France.

A. for

B. as

C. since

D. during

3. _______ I was going out, the telephone rang.

A. Since

B. While

C. As

D. Once

4. I read the letter _______ I walked along the river.

A. since

B. for

C. as

D. when

5. _______ the wealth of the country increases, more and more waste will be produced.

A. As

B. When

C. Since

D. While

6. —I'm going to the post office.

—_______ you're there, can you get me some stamps?

A. As

B. While

C. Because

D. If

7. _______ the day went on, the weather got worse.

A. With

B. Since

C. While

D. As

答案速查　1-5　BBCCA　6—7　BD