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As在高中英语课本中出现的频率很高，主要是作介词和连词使用。因其作为连词的用法较多。常是困扰学生的难点之一。下面我们对这一用法进行分类归纳。
一、as用于引导定语从句
As引导的定语从句又可分为限制性定语从句和非限制性定语从句。
(1)as引导的限制性定语从句通常构成“as…as…”，“such…as…”或者“the same…as…”等固定搭配，as在从句中用作主语、宾语、或表语。
例如：
①Repeat this as of ten as is necessary.
②Such women as knew Tom thought hewas charming.
③You must show my wife the samerespect as you show me.
(2)as可以作为关系代词引导非限制性定语从句。可以用来代替一个句子或单词，as引导的这类定语从句可以放在句首、句中或句中。
例如：
①As was expected，he performed thetask with sucoess.
②Sophia was dishonest，as could bejudged from her eyes.
⑨My teacher，as might be expected，was present at the meeting.
二、as用于引导时间、原因、方式或者让步状语从句
(1)as引导时间状语从句时，表示主句的动作和从句的动作往往同时发生，具有延伸意义，一般同延续性动词连用，有时可以翻译为“一边……一边……”。
A)某件事一发生，另一件事立即发生。
①As the sun lose.the fog disappeared.
B)在某事发生过程中，另一件事发生。
②As I was coming here，I met your brother.
c)两个动作同时发生。
③He smiled as passed.
④we get wlse as we get older.
(2)as引导原因状语从句往往是十分明显的原因，听者或读者已经知道或者能够看出来，语气较弱，只能起附带说明的作用，比较口语化。
例如：
①As allthe seats werefull，he stood up.
②It’s difficu It for us to know what to doas we are not his parents.
(3)as引导比较状语从句，表示同级比较，意思是“像……一样”。
例如：
①I cannot run as fast as he can.
(4)as可用于引导方式状语从句，意思是：“如同……”，或者“按照……”。
①The students do everything as theteacher does.
②I’ve changed it as you suggest.
(5)as用于引导让步状语从句，意思是“虽然”“尽管”，从句需要用倒装语序。
①child as he is.he knows a lot.
②Poor as he was，he was honest.
③Try as you will.you won"t manage it.
④Much as I admire him as a writer，Idon’t like him as a alan.
作者单位：河南省沈丘县第一高级中学
一、as用于引导定语从句
As引导的定语从句又可分为限制性定语从句和非限制性定语从句。
(1)as引导的限制性定语从句通常构成“as…as…”，“such…as…”或者“the same…as…”等固定搭配，as在从句中用作主语、宾语、或表语。
例如：
①Repeat this as of ten as is necessary.
②Such women as knew Tom thought hewas charming.
③You must show my wife the samerespect as you show me.
(2)as可以作为关系代词引导非限制性定语从句。可以用来代替一个句子或单词，as引导的这类定语从句可以放在句首、句中或句中。
例如：
①As was expected，he performed thetask with sucoess.
②Sophia was dishonest，as could bejudged from her eyes.
⑨My teacher，as might be expected，was present at the meeting.
二、as用于引导时间、原因、方式或者让步状语从句
(1)as引导时间状语从句时，表示主句的动作和从句的动作往往同时发生，具有延伸意义，一般同延续性动词连用，有时可以翻译为“一边……一边……”。
A)某件事一发生，另一件事立即发生。
①As the sun lose.the fog disappeared.
B)在某事发生过程中，另一件事发生。
②As I was coming here，I met your brother.
c)两个动作同时发生。
③He smiled as passed.
④we get wlse as we get older.
(2)as引导原因状语从句往往是十分明显的原因，听者或读者已经知道或者能够看出来，语气较弱，只能起附带说明的作用，比较口语化。
例如：
①As allthe seats werefull，he stood up.
②It’s difficu It for us to know what to doas we are not his parents.
(3)as引导比较状语从句，表示同级比较，意思是“像……一样”。
例如：
①I cannot run as fast as he can.
(4)as可用于引导方式状语从句，意思是：“如同……”，或者“按照……”。
①The students do everything as theteacher does.
②I’ve changed it as you suggest.
(5)as用于引导让步状语从句，意思是“虽然”“尽管”，从句需要用倒装语序。
①child as he is.he knows a lot.
②Poor as he was，he was honest.
③Try as you will.you won"t manage it.
④Much as I admire him as a writer，Idon’t like him as a alan.
作者单位：河南省沈丘县第一高级中学