帖子主题: when, as, while在引导时间状语从句时的主要用法及区别  

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发表于:Sun Apr 24 16:15:11 CST 2011
一、when表示“当……的时候”。从句中既可用延续性动词,又可用非延续性动词,这些动词既可以表示动作,又可表示状态。从句中的动作既可和主句的动作同时发生,又可在主句的动作之前或之后发生。如:
When I came into the room, I found him lying there asleep.

Mary was having dinner when I saw her.

When you meet a word you don't know, consult the dictionary.

She was beautiful when she was a girl.
二、如果when从句的主语与主句主语相同,谓语又是be动词,从句主语和be可以省略:当when从句主语与主句主语相同时,用when加分词可以替代状语从句。如:
When
(you are)in trouble, ask her for help.
When
(I was)sleeping, I never heard a thing.三、as表示"当……时""一面……一面","随着"。其具体用法如下
1
.表示"当……时"、"和……同时"。常指从句的动作未结束,主句中的动作就已发生。从句中多用表示动作的动词,而不用be动词或表示感觉、理解、知道这类动词。
As he stood there, he saw two men enter the bar.

She dropped the glass as she stood up.

As I was walking down the street, an American asked me for directions to the nearest station.

2
.用于平行的动作中,表示"一面……一面……"。常指一个主语同时进行两个动作。如:
He sang as he worked.

The students took notes as they listened.
3.用于平行发展的结构中,表示"随着……"。常指一个行为是另一个行为的结果,或一种状态随另一种状态变化。句中的动词多表示状态的发展变化。
As the wind rose the noise increased.

As it grew darker it became colder.

As he grew older he became more confident.
四、While表示"在……的时候"、"在……期间"。它强调主句的动作与从句的动作同时发生或主句的动作发生在从句的动作过程中。While从句中必须是表示动作或状态的延续性动词。如:
Never get on or off a bus while it is in motion.

The weather was fine while we were in Beijing.

She called while I was out.
1.如果主句的动作在从句的动作过程中发生,从句常用进行时。如:
While we were swimming someone stole our clothes.

Don’t talk so loud while others are working.
2.如果主句和从句主语相同,while加现在分词可代替状语从句。如:
We must strike while the iron is hot.

He took a bath while I was preparing dinner.

Come and pay a visit to the park while the flowers are in bloom.
三者的区别
通过以上分析我们可以看出,when, as, while引导时间状语从句时,侧重点有所不同。
1
、When可指时间点,又可指时间段,从句中可用延续性动词,也可用非延续性动词。
2
、While总是指一个时间段,从句中必须用延续性动词。 >
3
、as多用于平行结构。表示两个动作同时发生:一个主语同时进行两个动作:一种状态随另一种状态的变化而变化。
4
、表示主句的动作发生在从句的较长动作过程中,when, while, as均可使用。从句中为be动词时,多用when和while。谈论两个同时进行的长动作可用while;谈论两个平行动作或两种状态变化多用as。
 
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发表于:2017-11-23 10:32:04
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when, as, while在引导时间状语从句时的主要用法及区别


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