Question

as的用法

Answer 1

as的用法:

一、as作连词的用法：

1.作"当······的时候”，引导时间状语从句。注意与when、while的用法区别。

①when作"当······的时候”解，可以指较短的(一点)时间，也可指一段时间。如：

When he was at college, he could speak several foreign languages.

When the clock struck twelve, all the lights in the street went out.

② while常表示一段较长的时间或一个过程，强调主句谓语动词与从句谓语动词同时发生。如：

Work while you work.Play while you play.

③但属下列情形时，只用as，而不用when或while。

A)用于表示同一个人的两种动作交替进行，指“一边··…··，一边·…··”。如：

The girl dances as she sings on the stage.

He looked behind from time to time as he went forward.

B)表示两个同步发展的动作或行为，译为”随着……”。如：

As time went on / by,she became more and more worried.

As children get older, they become more and more interested in the things around them.

C)表示两个短促行为或事件几乎同时发生。如：

I thought of it just as you opened your mouth.

Just as the flying worm hit her face, she gave a loud cry.

D)后接名词表示某一年龄段时，用as。如：As a young man,he was active in sports.

2.as=since，作“既然”、"由于”解，引导原因状语从句，常用来表示已为人们所知或显而易见的原因或理由。如：

As / Since you're not feeling well, you may stay at home.

As he wasn't ready in time, we went without him.

3. as=in the way that, 作"像"、"按照······的方式”解，引导方式状语从句。如：

He speaks English as Americans do. Remember, you must do everything as I do.

4.用于as...as...或not so/ as...as...中，前一个as是副词，后一个as是连词，引导比较状语从句。如：

They helped the old man as often as possible.

I don't speak English so/ as well as he does.

5.作“虽然"、“尽管”解，引导让步状语从句。常用倒装语序，即adj./adv./n.+as+主语+谓语+主句。如：

Tired as they were, they walked on. Child as he is, he knows a lot. (child前不用冠词)

二、as作关系代词，引导定语从句，作"正如"、“这一点”解。如：

He is very careful,as his work shows. As is well-known, Taiwan belongs to China.

另外，当先行词被the same，such等词修饰时，常用as来引导定语从句。如：

Such a clever boy as he can learn anything quickly.

I was reading the same book as he bought yesterday.

三、as作介词的用法：

as引导的介词短语大多用作状语，as译为“作为”；少数情况可引起宾语补足语。如：As a League member, I'll take the lead in everything.(状语)

She works as a doctor.(状语)