as

一、as作从属连词时，引导不同种类的状语从句。

（1）as引导时间状语从句时，译作“当……时候”，可以放在主句之前，也可以放在主句之后。

例如：He smiled as he said goodbye to me.他向我道别时微笑了一下。

As she was walking in the park, she heard a girl singing.她在公园里散步时，听到一位女孩在唱歌。

I sang an English song as I went along the river.我边沿河边走边唱英文歌。

（2）as引导原因状语从句时，表示已知的原因，译作“既然；由于；因为……”，通常放在句首。

例如：As it is too late for you to go home, y ou’d better stay over night at this place.由于天太晚，你不能回家了，你最好留在这儿过夜。

As it is going to rain, the sports meet will be put off until next week.由于天要下雨，运动会将推迟到下星期开。

（3）as引导比较状语从句时，有“as …as”、“not as / so …as”结构，第一个as是副词，第二个as是连词。

译作“跟……一样”、“跟……不一样”。

这种从句有三种不同的结构形式和意义。

（A）表示两个不同的人（或物）在相同（或不同）方面的比较。

例如：He is as careful as his elder brother.他和他哥哥一样细心。

She is not so clever as her sister.她不如她姐姐聪明。

（B）表示同一个人（或物）在不同方面的比较。

例如：She is as kind as （she is ）honest.她既诚实又和蔼。

（4）as引导方式状语从句时，译作“按照；如同”。

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. 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 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. e.g ① When at Rome, do as Romans do. ② We do farm work as the old peasant teaches us.
As 用法小结
as用法归纳 as用法归纳

as用法归纳一、as作连词的用法1. as...as的用法as...as意为"和……一样"，表示同级的比较。

使用时要注意第一个as为副词，第二个as为连词。

其基本结构为：as+ adj./ adv. +as。

例如：(1)This film is as interesting as that one. (2)Your pen writes as smoothly as mine.其否定式为not as/so +adj./ adv. +as。

例如：This dictionary is not as/so useful as you think.若有修饰成分，如twice, three times, half, a quarter等，则须置于第一个as之前。

例如：Your bag is twice as expensive as mine2. as用作连词引导时间状语从句as与when，while都是引导时间状语从句的从属连词，含义都是"当……的时候"。

但它们有区别：用when时，从句的动作可以与主句的动作同时发生，也可以先于主句的动作发生；用while时，从句的动作为一过程，主句动作与从句动作同时进行或在从句动作过程中发生；用as时，主句和从句的动作同时发生，具有延续的含义。

例如：(1)It was snowing when he arrived at the construction site.(2)He was watching TV while his mother was cooking.(3) You will grow wiser as you grow older.3. as用作连词引导原因状语从句as，because，since都可以表示因果关系，连接原因状语从句，含义是"因为，由于"，但它们有区别：because表示的语气最强；as一般放在句首，语气较弱，较口语化；since常常用在书面语中，表示多为对方已知的、或稍加分析便可得知的原因，有时可译作"既然"。

As用法全析1. as作连词引导时间状语从句，意为“一边……一边……”，“随着”,“当……时”，常表示主句和从句的动作同时发生。

例如：They had a pleasant chat as they walked in the garden. 他们一边在花园里散步，一边愉快地聊天。

As she grew older, Jenny came to realize how much her parents loved her.随着年龄的增长，珍妮逐渐意识到父母是多么爱她。

2. as作连词引导原因状语从句，意为“因为，由于”，尤其是原因已经明显时或者说话人认为原因很明显时，从句放在主句的前后均可。

例如：As the 5:30 train had left, we had to wait for another two hours.由于五点半的火车已经开走，我们不得不再等两个小时。

考例：Jenny was very sad over the loss of the photos she had shot at Canada, ________ this was a memory she especially treasured.(2006广东卷)A. asB. ifC. whenD. where3. as 作连词引导方式状语从句，意为“照……方式”。

例如：Tom rearranged the furniture as his wife asked.汤姆按照妻子的要求重新摆放了家具。

考例：——Who should be responsible for the accident?——The boss, not the workers. They just carried out the order ________.(2008福建卷)A. as toldB. as are toldC. as tellingD. as they told(注意：as told为as they were told的省略)4. as作连词引导让步状语从句，意为“尽管、虽然”，从句必须用倒装结构，通常将作表语的形容词、名词，作状语的副词，或者将情态动词之后的动词原形提到as之前。