高三英语专题复习（Ⅴ） 许宝英语工作室
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 作副词，表示程度，意为“同样地”。在
“as…as”, “not as…as”结构中的第一个as是副 词，作“和/与…(不)一样”解。e.g
→ 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.
② We do farm work as the old peasant
teaches us. ③ When a pencil is partly in a glass of
water, it looks as if it were broken. ★ ④ As(it is)in your . 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“这一点”。这个 分句可以放在句首，句中，或句末。e.g
③ This elephant is like a snake, as anybody
can see.
④ As is well known, oceans cover more
in the north and rice in the south. 正如(像) 你们国家一样，…… 。
4. 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.
① He shouted aloud as he ran along. ② I was startled as he opened the door. ③ We get wiser as we get older.
2. 引导原因状语从句，与because的用法相近。
e.g ① As it was getting very late, we soon
①Jack is as tall as his father. ②He doesn’t speak English as/so fluently as you.
Ⅱ. As作连词，主要引导以下状语从句：
1. 引导时间状语从句。与while意义相近，强调 两个动作同时发生；或某事一发生，另一事立刻 发生。e.g
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
① He wished to be such a man as Lei
Feng was.
② My bike is the same as yours.
as we know now.
4.若非限制性定语从句中的谓语动词是 be said be known,be expected, be reported , be announced等结构时，不论是在句首，句中， 句末，都必须as用来引导. e.g
As is known to us, Taiwan is a part of China.
be most people in Australia. 3. 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/
e.g We regard the sun as the source of
than 70% of the earth. 3. 若非限制性定语从句位于句首，句中或句末，
则用as来引导。e.g
① As we expected, he completed his task
with great success. ② The compass was invented in China,
Ⅳ. As作介词
1. 作 “如，像”解。e.g
① They got united as one man. ② She spoke of me as her closed friend.
2. 作“充当，作为”解。e.g
③ As a writer, he was famous. ④English is spoken as the first language
most forms of energy.
Ⅴ. 含as的固定词组
1. as soon as→引导时间状语从句。 So/as far as I know→在句中作插入语。 意思是“据我所知”。
e.g As/So far as I know, he will come here
next Monday. 2. As well as→并列连接词组，意思是：“和，
5. 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
① Child as she is, she knows a lot. ★
→ Though she is a child, she knows a lot.
② Busy as he is, he insists on studying.
turned back.
② We must stop writing now, as I have
rather a lot of work to do.
3. 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 at Rome, do as Romans do.