高三英语复习课 as用法归纳
as一词在高中课本中，看起来简单，但用法很多，经常出现，而又不易掌握。
主要表现在词性多，词义广，用法灵活。现将其用法归纳如下：
Ⅰ. as作介词
1.作“如，像”充当，作为解。
(1) They got united as one man
(2) As a writer, he was famous.
(3) Don’t _____ him as a child. He can tell right from wrong.
2 As作为介词，常和以下动词连用。
regard…as/be known as/consider…as use…as/ describe…as/be remembered as work as/ act as/be honored as/
II.as作连词，主要引导以下状语从句：
1.as...as意为"和……一样"，表示同级的比较。第一个as为副词，第二个as为连词。其基本结构为：as+ adj./ adv. +as。例如：
(1)This film is as interesting as that one.这部电影和那部电影一样有趣。
(2)Your pen writes as smoothly as mine.你的钢笔书写起来和我的一样流畅。
其否定式为not as/so +adj./ adv. +as。例如：
This dictionary is not as/so useful as you think.这本字典不如你想象的那样有用。
若有修饰成分，如twice, three times, half, a quarter等，则须置于第一个as之前。例如：
Your bag is twice as expensive as mine.你的袋子比我的贵一倍。
2.As conj 引导时间状语从句，当……时，随着，一边……一边……
He shouted aloud as he ran along.
We get wiser as we get older.
改错
1.While she grew older she gained in confidence .
2. He was watching TV as his mother was cooking .
3.The little girl listened to music when she did her homework .
4.Hardly had we sat down to supper while the phone rang .
5.As I was walking ,I noticed a bird fly by.
3. 引导原因状语从句，与because的用法相近。
①As it was getting very late, we soon turned back.
② We must stop writing now, as I have rather a lot of work to do.
填空
1---why were you absent from the meeting ?
---_______ I was ill.
2.We shall not go to the park , _____it is raining.
3.________everybody is here let’s begin our prom。
4.He doesn’t know about it , _____for he didn’t see the film .
4. 引导方式状语从句，作“正如，好象，按照”解。主要的句式有 as if (as though);
just as; just as…as. e.g
(1)When in Rome, do as Romans do.
(2)When a pencil is partly in a glass of water, it looks as if it were broken. ★
(3)I”ve changed my plan_____.
A. As was told to
B. as told to
(4)Look!The cloud are gathering. It looks as if it ____ rain.
A. is going to
B. were going to
(5)He glanced around as if ______.
A. in search of something
B. searching for something
5. 引导条件状语从句。主要句式有：
as long as /so long as 只要
e.g As long as you study hard, you will make great progress.
6. 引导让步状语从句；作“虽然，尽管”解。这时从句常用倒状语序，即把从句中的表语,
状语或动词原形放在as之前。e.g
①Child as she is, she knows a lot. ★→ Though she is a child, she
knows a lot. ②Busy as he is, he insists on studying. → Though he is busy,
he … . ③ Try as he might, Tom could not get out of the
difficulties. → Though he might try,
Tom could not get out of the difficulties.
Ⅲ. As作关系代词
1.引导限制性定语从句，用在“such… as”, “the same …as/the same as”等结构中，
常译作“像……一样的人或物”，“凡是……的人或物”。e.g
He wished to be such a man as Lei Fang was.
My bike is the same as yours.
2.引导非限制性定语从句，用来指代它前面的整个句子(即先行句)，意思是“正如”“好
像”。这个分句可以放在句首，句中，或句末。e.g
As we expected, he completed his task with great success.
