英语常见连词as引导让步比较时间原因方式状语从句

英语常见连词as引导让步比较时间原因方式状语从句
连词as在英语中具有丰富的用法，可以引导不同类型的状语从句，包括比较、时间、原因、方式、让步等。
一、引导让步状语从句
as在引导让步状语从句时，常常与though或although互换使用，表示让步关系。例如：
* As/Though/Although he is poor, he is honest.（尽管他很穷，但他很诚实。）
* Child as/though/although he is, he knows a lot.（他虽然是个孩子，但懂得很多。）

二、引导比较状语从句
as用作连词时，可以引导比较状语从句，表示两个事物之间的相似之处。例如：
* She is as tall as her sister.（她和她姐姐一样高。）
* This book is not as interesting as that one.（这本书不如那本有趣。）
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三、引导时间状语从句
as还可以引导时间状语从句，表示两个动作同时发生或者一个动作发生在另一个动作的过程中。例如：
* As he spoke, the audience laughed.（他说话时，观众笑了起来。）
* As the sun rose, the mountains came into view.（太阳升起时，山峦映入眼帘。）

四、引导原因状语从句
在某些情况下，as也可以引导原因状语从句，表示某个动作或状态的原因。例如：
* As it was raining, we stayed at home.（因为下雨，我们待在家里。）
* As he was tired, he went to bed early.（因为他累了，所以他早点上床睡觉。）

五、引导方式状语从句
as还可以引导方式状语从句，表示某个动作或状态的方式。例如：
* Do as I do.（照我这样做。）
* Speak as slowly as you can.（尽可能慢地说。）

练习题
一、选择填空
1. ______ a child, he showed great interest in music.
A. As B. Like C. Since D. For
2. He spoke ______ a native speaker.
A. as fluently as B. more fluently than
C. so fluently that D. as more fluently as
3. We must finish the work ______ soon as possible.
A. as B. so C. too D. very
4. He is ______ tall ______ his brother.
A. as; as B. not; as C. not as; so D. so; as
5. ______ I know, he is a good teacher.
A. So B. As C. Such D. Too
6. He works hard, ______ he is not very clever.
A. but B. and C. so D. as

二、改写句子
1. She sings well and dances well too. (用as…as改写)
She sings ______ ______ well ______ she dances.
2. He is a reliable person. (用as far as I know改写)
______ ______ ______ I know, he is a reliable person.
3. He didn't recognize me when he saw me. (用as if改写)
He looked at me ______ ______ he didn't recognize me.
4. She finished her work quickly and then went home. (用as soon as改写)
She went home ______ ______ ______ she finished her work.
5. He is not as tall as his brother. (用not…so…as改写)
He is ______ tall ______ his brother.

答案：
一、选择题
1. A
2. A
3. A
4. B
5. B
6. D

二、改写句子
1. as; as; as
2. As far as
3. as if
4. as soon as
5. not; so

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英语常见连词as引导让步比较时间原因方式状语从句

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