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52培训网 > 新闻资讯 > 学习资讯 >  as; when与while的用法区别

as; when与while的用法区别

发布时间:2019-10-16 23:30:19  来源:52培训网  浏览:    【】【】【

as; whenwhile的用法区别
as,when, while作为连词都有……的时候的意思它们的区别是 

1.as意为…………”之时”,重在表示动作同时发生或伴随进行


They talked as they walked.他们边走边谈
As(when, while)I was doing my homework, he came
当我做作业时他进来了。  

 

2.when可以指较短的时间也可以指较长的时间它所引导的时间状语从句中的动作可以与主句的动作同时发生也可以是先后发生从句的动词既可以是终止性动词也可是持续性动词
When I got home, he was having supper.
我到家时他正在吃晚饭
When the clock struck ten, all the lights went out.
当钟敲响10点时灯全部熄了
3. while常表示一段较长的时间或一个过程强调主从句的动词所表示的动作或状态是同时发生的由它引导的从句中的谓语动词必须是延续性动词
While we were in London. we saw Miss Green twice
在伦敦时我们见到格林小姐两次 

 

4. while只指时间段”,不指时间点”,从句的动词只限于持续性动词

While i slept a thief broke in.在我睡觉时贼闯了进来
注意】①当从句的谓语动词是表动作的延续性动词时,when, whilea才有可能互相替换
While / When /As we were still laughing. the teacher came in
正当我们仍在大声嘻笑时老师进来了
从句的谓语动词如果表示状态时通常用 while。
We must strike while the iron is hot.
我们应该趁热打铁

 

请选用as; when; while词语的适当形式填空

)I saw him           he was going out of the super market
2) Sorry, I was out             you called

3)Don' t talk so loud                others are working

4)               I am weak from hunger, he suffered from having too much food

5)               he spoke, they moved forward in their seats.
Keys: I)as/when 2)when 3)while 4)While 5)As
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