when和while的区别

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when可用作并列连词,表示“这时(突然)”;while也可以用作并列连词,表示“而”“却”(表示对比);但as则没有类似用法。本文是本站小编精心编辑的when和while的相关内容,希望能帮助到你!

when和while的区别

when有鉴于之意,如:

Why do you need a new job when you have got such a good one?

when 有虽然、尽管等让步之间,如:

They kept digging when they must know there was no hope to escape.

while 有对比之意,译为“而”。如:

That region has plenty of natural resouces, while this one has none.

while 有表示“部分同意”之意,如:

While she is likable girl, she is difficult to work with.

when和while 都有“在...时候”的意思。

主从句都是长时间的动作时,只用while;

While she read the paper, I cleared up the kitchen.

涉及到年龄和生活的不同阶段,用when;

When I was a child , I lived in London.

while不用于短时间的动作(这个大家应该都知道)

when和while的区别

(1)when即at the time that…,指「在……之时」,例如:

When I finished my letter, I posted it.

我写完信便寄出。

(2)while即at the same time that…,亦指「在……之时」,但其所表示的「同时」?有「持续性」,例如:

We must strike while the iron is hot.

我们必须趁热打铁。

(3)while不可用来表示「时间点」(a point of time),例如:

错:While I finished my letter, I posted it.

因为动作具有「瞬间性」。

(4)while可用于对比(contrast),when则不可,例如:

Mary is in blue while Cindy is in black.

玛丽穿蓝色衫,而仙蒂穿黑色衫。

(5)while又可表示「只要」(as long as),例如:

While there is life, there is hope.

留得青山在,不怕没柴烧。

(6)再可表示「尽管」(although),例如:

While I admit that the task is difficult, I don't think that it is impossible.

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