when和while的区别

时间:2022-03-24 02:07:12 科普知识 我要投稿
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when和while的区别

  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。以下是小编精心编辑的when和while的区别,希望能帮助到大家。

  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」須有「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 dont think that it is impossible.

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