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as是同学们学习英语的重点单词，也是难点之一。高考中无论是单选还是完型填空常有涉及。本文从as的词性、词义和结构搭配着手，深入探讨其用法，以期对同学们有所帮助。
一、引导时间状语从句，作“当……的时候”、“随着……”之意，连词
As the science and technology develops，more and more countries are trying to explore the space.（=With the development of science and technology，more and more countries are trying to explore the space.）随着科技的发展，越来越多的国家正在努力探索太空。
二、引导原因状语从句，与because的用法相近，连词
You must hurry up as there is little time left. 你必须快点，因为时间所剩无几。
三、引导比较状语从句，意为“同样地，非常”
常用在句型“as...as...”，“not as...as...”结构中，作“和/与……（不）一样”解。其中第一个as是副词，相当于“very”，第二个as作连词用。
Jack is as tall as his father. 杰克和他的父亲一样高。
He doesn’t speak English as/so fluently as you. 他的英语说得不如你流利。
四、介词“作为”
As a leader，he didn’t set a good example for his employees. 作为领导，他没有给他的员工树立一个好榜样。
As a driver，he shouldn’t drive the car after drinking. 作为一个驾驶员，他不应该酒后驾车。
I respect him as a writer and as a man. 我尊重他这位作家，也尊重他这个人。
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。
五、引导让步状语从句，作“虽然，尽管”解
从句常用倒装语序，即把从句中的表语、状语或动词原形放在as之前。
Young as he is，he knows a lot about the IT.（=Although he is young，he knows a lot about the IT）. 尽管年轻，他却知道关于IT的很多知识。（表语提前居首）
Child as he is，he tries his best to protect the disabled.（=Although he is a child，he tries his best to protect the disabled.）虽然他是个小孩，他尽力来保护残疾人。
注意，当名词前面有不定冠词时，倒装后，不定冠词一定要省去，但若名词前有形容词修饰，则可以保留不定冠词。
Although he is a young child，he played the piano very well.（=A young child as he is，he played the piano very well.）虽然他是个小孩，但他钢琴弹得很好。
六、引导定语从句
1.引导非限制性定语从句，常放在句首，as在从句中通常作主语或宾语。此时不能用which
As is known to all，China is a developing country. 众所周知，中国是一个发展中国家。
As we all know，Yang shanzhou devoted all his life to the chinese modernization strategy.我们都知道，杨善洲同志把他的一生奉献给了中国现代化建设事业。
2.引导非限制性定语从句，不放在句首，此时as表示某人关于某事的“依据、态度、解释和评论”，含有“正如……”之意，强调主观判断；而which往往是说话人陈述一个客观事实，相当于“and this”
He didn’t complete the project on time，as he promised in his report. 他没有像他在报告中承诺的那样按时完成这项工程。
Tom is said to have gone abroad three years before，which（=and this）turns out to be true.据说三年前汤姆出国了，现在证明确实如此。
3.引导限制性定语从句，as所引导的定语从句所修饰的名词前常用such，the same等修饰
I have never seen such a student as you mentioned in the conversation. 我从来没见过像你在谈话中所提的那样的学生。
This situation is not the same as you met last time. 此形势和你上次遇到的不一样。
注意“the same...that”和“the same...as”的区别
The watch he had is the same as I saw in that supermarket.他所戴的手表和我在商场里见到的那块表是一样的。（同一形状的两块表）
His watch lost is just the same that I saw in the classroom. He must have left it last night when he went home. 他所丢失的那块表就是我在教室里见到的那块表（同一块表），他一定是昨晚回家时丢在那的。
七、引导方式状语从句或比较状语从句，作“正如，（如）像”，“按照……的方式”解
When at Rome，do as Romans do. 入乡随俗。（方式状语从句）
You should finish it as （you are）required to. 你必须按照要求的去做。
八、用于一些固定搭配
①as...as... 与……相同的程度； 与……等同
The dress is twice as expensive as that. 这件衣服比那件贵两倍。
②as if/though 好像；仿佛
She loves the child as if/though he were her own. 她爱这个孩子如同爱自己的孩子。
as if/though也可用来引导表语从句，常用在“it appears/looks/seems...+as if/though”句型结构中。如：
It appears as if/though it is going to clear up. 看起来天要晴了。
③as well as 同（一样也）；和；还
On Sunday his landlady provided dinner as well as breakfast. 周日他的房东太太提供晚餐和早餐。
We cannot expect her to do the housework as well as look after the children. 我们不能期望她又做家务又带孩子。
She is clever as well as beautiful. 她不仅漂亮，而且聪明。
注：as well意为“也，还”经常放在句尾，与too，also同义词。如：
Come here early，and bring your brother as well. 来这早一点，把你弟弟也带上。
④such...as 像……这样的；?摇such as 例如
Such simple actions as eating，drinking become difficult. 像吃、喝这样的简单动作变得困难了。
I bought a lot of fruits，such as apples，oranges，bananas and so on.我买了许多水果，像苹果、橘子、香蕉等。
⑤as for 至于某人（某事物）
As for you，you ought to be ashamed of yourself.至于你，应该为你自己而羞愧。
⑥as to 关于某事物；提到某事物
As to correcting our homework，the teacher always makes us do it ourselves.关于改正家庭作业，老师总让我们自己做。
⑦so as to，so...as to 后跟动词原形，表示目的或结果
He studied hard so as to pass the exam. 他努力学习以便通过考试。（表示目的）
⑧as a matter of fact 其实；实际上
As a matter of fact，I’m very fond of housework. 其实，我非常喜欢干家务。
⑨as a result 结果 （发生某种情况）
As a result，he had been given an excellent job. 结果，他被安排了一个非常好的工作。
⑩as long as 只要
As long as you work hard，you will succeed sooner or later. 只要你工作努力，你迟早会成功。
此外，as much as/as many as（多达……达到……至多）。还有as a whole（就整体来说）/as follows（如下），as usual （照常）/as a （general） rule（通常）/ as above（如上）等，我们需要在平时学习过程中不断归纳、总结，反复运用，从而达到熟练掌握的目的。
一、引导时间状语从句，作“当……的时候”、“随着……”之意，连词
As the science and technology develops，more and more countries are trying to explore the space.（=With the development of science and technology，more and more countries are trying to explore the space.）随着科技的发展，越来越多的国家正在努力探索太空。
二、引导原因状语从句，与because的用法相近，连词
You must hurry up as there is little time left. 你必须快点，因为时间所剩无几。
三、引导比较状语从句，意为“同样地，非常”
常用在句型“as...as...”，“not as...as...”结构中，作“和/与……（不）一样”解。其中第一个as是副词，相当于“very”，第二个as作连词用。
Jack is as tall as his father. 杰克和他的父亲一样高。
He doesn’t speak English as/so fluently as you. 他的英语说得不如你流利。
四、介词“作为”
As a leader，he didn’t set a good example for his employees. 作为领导，他没有给他的员工树立一个好榜样。
As a driver，he shouldn’t drive the car after drinking. 作为一个驾驶员，他不应该酒后驾车。
I respect him as a writer and as a man. 我尊重他这位作家，也尊重他这个人。
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。
五、引导让步状语从句，作“虽然，尽管”解
从句常用倒装语序，即把从句中的表语、状语或动词原形放在as之前。
Young as he is，he knows a lot about the IT.（=Although he is young，he knows a lot about the IT）. 尽管年轻，他却知道关于IT的很多知识。（表语提前居首）
Child as he is，he tries his best to protect the disabled.（=Although he is a child，he tries his best to protect the disabled.）虽然他是个小孩，他尽力来保护残疾人。
注意，当名词前面有不定冠词时，倒装后，不定冠词一定要省去，但若名词前有形容词修饰，则可以保留不定冠词。
Although he is a young child，he played the piano very well.（=A young child as he is，he played the piano very well.）虽然他是个小孩，但他钢琴弹得很好。
六、引导定语从句
1.引导非限制性定语从句，常放在句首，as在从句中通常作主语或宾语。此时不能用which
As is known to all，China is a developing country. 众所周知，中国是一个发展中国家。
As we all know，Yang shanzhou devoted all his life to the chinese modernization strategy.我们都知道，杨善洲同志把他的一生奉献给了中国现代化建设事业。
2.引导非限制性定语从句，不放在句首，此时as表示某人关于某事的“依据、态度、解释和评论”，含有“正如……”之意，强调主观判断；而which往往是说话人陈述一个客观事实，相当于“and this”
He didn’t complete the project on time，as he promised in his report. 他没有像他在报告中承诺的那样按时完成这项工程。
Tom is said to have gone abroad three years before，which（=and this）turns out to be true.据说三年前汤姆出国了，现在证明确实如此。
3.引导限制性定语从句，as所引导的定语从句所修饰的名词前常用such，the same等修饰
I have never seen such a student as you mentioned in the conversation. 我从来没见过像你在谈话中所提的那样的学生。
This situation is not the same as you met last time. 此形势和你上次遇到的不一样。
注意“the same...that”和“the same...as”的区别
The watch he had is the same as I saw in that supermarket.他所戴的手表和我在商场里见到的那块表是一样的。（同一形状的两块表）
His watch lost is just the same that I saw in the classroom. He must have left it last night when he went home. 他所丢失的那块表就是我在教室里见到的那块表（同一块表），他一定是昨晚回家时丢在那的。
七、引导方式状语从句或比较状语从句，作“正如，（如）像”，“按照……的方式”解
When at Rome，do as Romans do. 入乡随俗。（方式状语从句）
You should finish it as （you are）required to. 你必须按照要求的去做。
八、用于一些固定搭配
①as...as... 与……相同的程度； 与……等同
The dress is twice as expensive as that. 这件衣服比那件贵两倍。
②as if/though 好像；仿佛
She loves the child as if/though he were her own. 她爱这个孩子如同爱自己的孩子。
as if/though也可用来引导表语从句，常用在“it appears/looks/seems...+as if/though”句型结构中。如：
It appears as if/though it is going to clear up. 看起来天要晴了。
③as well as 同（一样也）；和；还
On Sunday his landlady provided dinner as well as breakfast. 周日他的房东太太提供晚餐和早餐。
We cannot expect her to do the housework as well as look after the children. 我们不能期望她又做家务又带孩子。
She is clever as well as beautiful. 她不仅漂亮，而且聪明。
注：as well意为“也，还”经常放在句尾，与too，also同义词。如：
Come here early，and bring your brother as well. 来这早一点，把你弟弟也带上。
④such...as 像……这样的；?摇such as 例如
Such simple actions as eating，drinking become difficult. 像吃、喝这样的简单动作变得困难了。
I bought a lot of fruits，such as apples，oranges，bananas and so on.我买了许多水果，像苹果、橘子、香蕉等。
⑤as for 至于某人（某事物）
As for you，you ought to be ashamed of yourself.至于你，应该为你自己而羞愧。
⑥as to 关于某事物；提到某事物
As to correcting our homework，the teacher always makes us do it ourselves.关于改正家庭作业，老师总让我们自己做。
⑦so as to，so...as to 后跟动词原形，表示目的或结果
He studied hard so as to pass the exam. 他努力学习以便通过考试。（表示目的）
⑧as a matter of fact 其实；实际上
As a matter of fact，I’m very fond of housework. 其实，我非常喜欢干家务。
⑨as a result 结果 （发生某种情况）
As a result，he had been given an excellent job. 结果，他被安排了一个非常好的工作。
⑩as long as 只要
As long as you work hard，you will succeed sooner or later. 只要你工作努力，你迟早会成功。
此外，as much as/as many as（多达……达到……至多）。还有as a whole（就整体来说）/as follows（如下），as usual （照常）/as a （general） rule（通常）/ as above（如上）等，我们需要在平时学习过程中不断归纳、总结，反复运用，从而达到熟练掌握的目的。