高三英语专题复习( 高三英语专题复习(Ⅲ) As 用法小结
as用法归纳 as用法归纳
as一词在高中课本中,看起来简单, as一词在高中课本中,看起来简单,但用法 一词在高中课本中 很多,经常出现,而又不易掌握。 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。 在词性多,词义广,用法灵活。现将其用法 归纳如下: 归纳如下: 作副词,表示程度,意为“同样地” 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 结构中的第一个 as是副词,作“和/与…(不)一样”解。e.g 是副词, 一样” 是副词 与 不 一样 ①Jack is as tall as his father. ②He doesn’t speak English as/so fluently as you.
作连词, Ⅱ. As作连词,主要引导以下状语从句: 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 引导时间状语从句。 意义相近, 意义相近 调两个动作同时发生;或某事一发生, 调两个动作同时发生;或某事一发生,另一事 立刻发生。 立刻发生。e.g 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。 引导原因状语从句, 的用法相近。 的用法相近 e.g ① As 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.

  3. 引导方式状语从句,作“正如,好象,按照”解。 引导方式状语从句, 正如,好象,按照” 主要的句式有as 主要的句式有 if(as though);just as;just as…as . e.g ① When at Rome, do as Romans do. 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 country, we grow wheat in the north and rice in the south. 正如(像) 正如 像 你们国家一样, 你们国家一样,…… 。

  4. 引导条件状语从句。主要句式有: 引导条件状语从句。主要句式有: as long as /so long as 只要

  5. 引导让步状语从句;作“虽然,尽管”解。 引导让步状语从句; 虽然,尽管” 这时从句常用倒状语序,即把从句中的表语,状 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 之前。 语或动词原形放在 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. Though he is busy, he … . →
e.g As long as you study hard, you will make great progress.
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 作关系代词
引导限制性定语从句,用在“
  1.引导限制性定语从句,用在“such… as”, “the same …as/the same as”“so/as…as”等结构中,e.g 等结构中, 等结构中 ① He wished to be such a man as Lei Feng was. ② The teacher gave the students so difficult a problem no one could work out.
③ He is not the same man he used to be.
  2. 引导非限制性定语从句,用来指代它前面的 引导非限制性定语从句, 整个句子(即先行句 意思是“这一点” 即先行句), 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。 分句可以放在句首,句中,或句末。e.g
This elephant is like a snake, as anybody can see.

As is well known, oceans cover
more than 70% of the earth. 若非限制性定语从句位于句首,句中或句末,
  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 来引导。 则用 来引导。e.g
① As we expected, he completed his task with great success. ② The compass was invented in China, 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 等结构时, 等结构时 不论是在句首,句中, 都必须as用来引导 用来引导. 末,都必须 用来引导 e.g As is known to us, Taiwan is part of China.
Ⅳ. As作介词 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 充当,作为”
③ As a writer, he was famous. ④English is spoken as the first language by most people in Australia.

  3. As作为介词,常和以下动词连用。 作为介词, 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/look on as e.g We regard the sun as the source of most forms of energy.
Ⅴ. 含as的固定词组 的固定词组
So/as far as I know→在句中作插入语。 →在句中作插入语。 意思是“据我所知” 意思是“据我所知”。 e.g As/So far as I know, he will come here next Monday. →并列连接词组,意思是:
  2. As well as→并列连接词组,意思是:“和, 同”。 当其连接两个并列主语时 谓语动词应与前面的主 当其连接两个并列主语时,谓语动词应与前面的主 连接两个并列主语 在数上保持一致。 语在数上保持一致。也可以和短 语not only…but also进行替换。 e.g 进行替换。 进行替换 My parents as well as my elder sister enjoy ① music. 试比较下面句子。 试比较下面句子。 My elder sister as well as my parents enjoys music. →引导时间状语从句。
  1. as soon as→引导时间状语从句。
② Tom studies Japanese as well as Chinese. →
Tom studies not only Chinese but also Japanese. ★★ 经常放在句尾。 →译为“
  3. as well→译为“也,还”经常放在句尾。与too, also同义词。(may/might as well)e.g 同义词。 同义词 Come here early, and bring your brother as well. →
  4. So as to do sth./so…as to do sth.→引导 目地或 结果状语。 结果状语。e.g He studies hard so as to pass the exam. He was so strong as to carry the heavy box.
  5. such as→意为“例如,诸如”可用来引入同位语, →意为“例如,诸如”可用来引入同位语, 举一例或数例说明它与之同位词的词 所含的具体内 容。
e.g There are different forms of energy, such as heat energy,light energy, sound energy and etc. 关于, 关于
  6. as to(=as for/as regards)关于,至于 as much as/as many as “ 多达 ,达到 至多” 多达…,达到… 至多” e.g There is no doubt as to his honesty.
He can earn as much as 500 dollars a day. 由于……的结果 as a 的结果) 由于 的结果
  7.as a result/as a result of(由于 whole(就整体来说 就整体来说)/as follows(如下 ) as usual (照 就整体来说 如下 照 通常) as a matter of 常)/as a (general) rule(通常 通常 fact(事实上 事实上)/as above(如上 as soon as 如上) 事实上 如上 possible/as early as possible as quickly as possible
More examples:
① She died as a result of the accident. ② The reasons are as above(as follows). ③ The machine runs as usual. ④ As a matter of fact, air is a gas. ⑤ His father gets up early as a rule. ⑥ You should improve your English as soon as possible. ⑦ When sound travels through air, the air, as a whole doesn’t move. ⑧ Today our life has been much better as compared with that before liberation. 和解放前比起来我们今天的生活好得多了。 解放前比起来我们今天的生活好得多了。
 

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