高考中as的用法小结

as可以作连词、介词及关系代词。现将其用法小结如下:

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。 ① when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. as的这种用法,请看2001年的高考题:

is known to everybody, the moon travels round the earth once every month.

A. It B. As C. That D. What 字母下划横线的为正确答案)

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)

They have me as one of their own children.(引起宾语补足语)