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when while as的区别

2020-04-27 14:06:18文/颜雨

when可以和延续性动词连用,也可以和短暂性动词连用;而while和as只能和延续性动词连用。when从句的谓语动词可以在主句谓语动作之前、之后或同时发生;while和as从句的谓语动作必须是和主句谓语动作同时发生。when可以用于表示“一……就……”的句型中(指过去的事情)。

when while as的区别

一、when可以和延续性动词连用,也可以和短暂性动词连用;而while和as只能和延续性动词连用。

① Why do you want a new job when you’ve got such a good one already?(get为短暂性动词)你已经找到如此好的工作,为何还想再找新的?

②Sorry,I was out when you called me.(call为短暂性动词)对不起,你打电话时我刚好外出了。

③Strike while the iron is hot.(is为延续性动词,表示一种持续的状态)趁热打铁。

④ The students took notes as they listened.(listen为延续性动词)学生们边听课边做笔记。

二、when从句的谓语动词可以在主句谓语动作之前、之后或同时发生;while和as从句的谓语动作必须是和主句谓语动作同时发生。

1.从句动作在主句动作前发生,只用when。

①When he had finished his homework,he took a short rest.(finished先发生)当他完成作业后,他休息了一会儿。

②When I got to the airport,the guests had left.(got to后发生)当我赶到飞机场时,客人们已经离开了。

2.从句动作和主句动作同时发生,且从句动作为延续性动词时,when,while,as都可使用。

①When/While/As we were dancing,a stranger came in.(dance为延续性动词)当我们跳舞时,一位陌生人走了进来。

②When/While/As she was making a phone call,I was writing a letter.(make为延续性动词)当她在打电话时,我正在写信。

3.当主句、从句动作同时进行,从句动作的时间概念淡化,而主要表示主句动作发生的背景或条件时,只能用as。这时,as常表示“随着……”;“一边……,一边……”之意。

①As the time went on,the weather got worse.(as表示“随着……”之意)

②The atmosphere gets thinner and thinner as the height increases.随着高度的增加,大气越来越稀薄。

③As years go by,China is getting stronger and richer.随着时间一年一年过去,中国变得越来越富强了。

④The little girls sang as they went.小姑娘们一边走,一边唱。

⑤The sad mother sat on the roadside,shouting as she was crying.伤心的妈妈坐在路边,边哭边叫。

4.在将来时从句中,常用when,且从句须用一般时代替将来时。

①You shall borrow the book when I have finished reading it.在我读完这本书后,你可以借阅。

②When the manager comes here for a visit next week,Ill talk with him about this.下周,经理来这参观时,我会和他谈谈此事。

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