在高中英语课本中, 我们常常见到as的身影, as的用法很多，它有时用来引导词组，有时用来引导句子, ,有时又可以作为一种固定结构出现, 如: as well as; as follows ； as to等等。那么中学课本里的As，常用的用法有哪些呢?
1 as 用作副词,意为同样的,常用于 "as...as"结构,表示 "与......一样"用于not asso...as 结构时,表示 "与......不一样",如:
I work as hard as you used to. 我像你一样用功。
I don't have asso many books as you have. 我的书没有你的那么多。
2 as用作连词,引导(1)方式状语从句,表示 "像......一样";(2)引导时间状语从句,表示 "当......时候";(3)引导原因状语从句,表示 "因为";(4)引导让步状语从句,表示 "虽然" 或"尽管"；（5） as 用于(not)so ...as...的结构中,引导结果状语或目的状语。 同时，还要注意as引导的倒装句。
She told me to do as she did.(方式状语) 她叫我像她那样做。
I rose as she came in .(时间状语) 她进来时我站了起来。
As I am ill ,I won't go.(原因状语) 我病了,不去了。
Child as he is ,he knows a lot of things.(让步状语) 虽然是个孩子,但是知道许多事情。
I am not so foolish as to make such a mistake.(结果状语) 我不至于愚蠢到犯这种错误的程度。
Our eating habits have changed , as has our way of life . （倒装句）我们的饮食习惯发生了变化，我们的生活方式也发生了变化。
3 as用作介词, 常表示身份, 意为 "作为", 例如:
As a pupil ,you must study hard .作为一名学生,你必须努力学习。
4 as用作代词，引导非限制性定语从句，一般代表整句话的内容，而且它在句中的 位置比较灵活，可置于句首，也可以位于句中或句末。例如：
If knowledge is power . as sir Francis Bacon famously wrote in 1597 , then perhaps creativity can be described as the ability to use that power . 如果像弗朗斯培根1597年曾写的：知识就是力量。那么创造力就是运用那种力量的能力。
5 as if 或as though 用作复合连词,表示 "好像" "似乎", 引导状语从句或表语从句，其内容多为想象的或夸大的, 常用虚拟语气。 但如果从句的内容的确可能, 也可用直陈语气。另外， as if 或as though 还可引导不定式，形容词短语，介词短语等。
She talks as if she were the queen . 她谈起话来就像她是皇后似的。
It looks as if it is going to rain . 看起来似乎要下雨。
She opened her bent as though under a weight .他的背驼了,好像压着重担。
6 as soon as 短语用作复合连词则表示 "一......就......" 或"刚......就......", 引导的是时间状语从句, 常用一般现在时表示将来。
As soon as he comes back , I'll tell him the news. 他一回来,我就告诉他这个消息.。
As soon as I'm on board , I always feel sick . 我一到船上,就总是感到恶心。
此外,高中英语课本中还常会碰到①as well as②asso long as③as... as possible这样的短语,它们有以下一些用法:
⑴ as well as 表示 "除......之外" "又" "也"或 "和......一样好",当as well as 用于主语部分时,更像介词,它引导的一个词组，我们理解为插入语,谓语动词必须与as well as前面的名词或代词保持人称和数的一致。例如：
Mother, as well as her children ,was invited to the party .妈妈和她的孩子们应邀参加了晚会。
The parents, as well as their child ,were invited to the party. 父母和他们的孩子被邀请参加了晚会。
⑵ asso long as 表示条件,引导条件状语从句,意为 "只要"或 "在......的情况下"。例如:
This project can go on as it is not raining. 只要不下雨,工程就可以继续进行。
⑶as... as possible 是as... as it is possible 的缩略形式,意为 "尽可能地......"，例如：
Please telephone your reply to me as soon as possible 请你尽快回我的电话.
在我们作文中,还会经常运用到as的短语,例如:as a matter of fact (事实上,实际上); as a result(结果);as a rule (通常);as for (至于);such as(例如);as usual(通常);the same as......(与......相同)等等。
As的用法确实多而且繁杂，但as无论是以什么结构或形式出现,只要抓住它的词性,从词性的角度去分析,我们就不难理解它的用法。
生词表:
1 as 用作副词,意为同样的,常用于 "as...as"结构,表示 "与......一样"用于not asso...as 结构时,表示 "与......不一样",如:
I work as hard as you used to. 我像你一样用功。
I don't have asso many books as you have. 我的书没有你的那么多。
2 as用作连词,引导(1)方式状语从句,表示 "像......一样";(2)引导时间状语从句,表示 "当......时候";(3)引导原因状语从句,表示 "因为";(4)引导让步状语从句,表示 "虽然" 或"尽管"；（5） as 用于(not)so ...as...的结构中,引导结果状语或目的状语。 同时，还要注意as引导的倒装句。
She told me to do as she did.(方式状语) 她叫我像她那样做。
I rose as she came in .(时间状语) 她进来时我站了起来。
As I am ill ,I won't go.(原因状语) 我病了,不去了。
Child as he is ,he knows a lot of things.(让步状语) 虽然是个孩子,但是知道许多事情。
I am not so foolish as to make such a mistake.(结果状语) 我不至于愚蠢到犯这种错误的程度。
Our eating habits have changed , as has our way of life . （倒装句）我们的饮食习惯发生了变化，我们的生活方式也发生了变化。
3 as用作介词, 常表示身份, 意为 "作为", 例如:
As a pupil ,you must study hard .作为一名学生,你必须努力学习。
4 as用作代词，引导非限制性定语从句，一般代表整句话的内容，而且它在句中的 位置比较灵活，可置于句首，也可以位于句中或句末。例如：
If knowledge is power . as sir Francis Bacon famously wrote in 1597 , then perhaps creativity can be described as the ability to use that power . 如果像弗朗斯培根1597年曾写的：知识就是力量。那么创造力就是运用那种力量的能力。
5 as if 或as though 用作复合连词,表示 "好像" "似乎", 引导状语从句或表语从句，其内容多为想象的或夸大的, 常用虚拟语气。 但如果从句的内容的确可能, 也可用直陈语气。另外， as if 或as though 还可引导不定式，形容词短语，介词短语等。
She talks as if she were the queen . 她谈起话来就像她是皇后似的。
It looks as if it is going to rain . 看起来似乎要下雨。
She opened her bent as though under a weight .他的背驼了,好像压着重担。
6 as soon as 短语用作复合连词则表示 "一......就......" 或"刚......就......", 引导的是时间状语从句, 常用一般现在时表示将来。
As soon as he comes back , I'll tell him the news. 他一回来,我就告诉他这个消息.。
As soon as I'm on board , I always feel sick . 我一到船上,就总是感到恶心。
此外,高中英语课本中还常会碰到①as well as②asso long as③as... as possible这样的短语,它们有以下一些用法:
⑴ as well as 表示 "除......之外" "又" "也"或 "和......一样好",当as well as 用于主语部分时,更像介词,它引导的一个词组，我们理解为插入语,谓语动词必须与as well as前面的名词或代词保持人称和数的一致。例如：
Mother, as well as her children ,was invited to the party .妈妈和她的孩子们应邀参加了晚会。
The parents, as well as their child ,were invited to the party. 父母和他们的孩子被邀请参加了晚会。
⑵ asso long as 表示条件,引导条件状语从句,意为 "只要"或 "在......的情况下"。例如:
This project can go on as it is not raining. 只要不下雨,工程就可以继续进行。
⑶as... as possible 是as... as it is possible 的缩略形式,意为 "尽可能地......"，例如：
Please telephone your reply to me as soon as possible 请你尽快回我的电话.
在我们作文中,还会经常运用到as的短语,例如:as a matter of fact (事实上,实际上); as a result(结果);as a rule (通常);as for (至于);such as(例如);as usual(通常);the same as......(与......相同)等等。
As的用法确实多而且繁杂，但as无论是以什么结构或形式出现,只要抓住它的词性,从词性的角度去分析,我们就不难理解它的用法。
生词表:
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