aswhenwhile这三个词意为”当～的时候时”有什么区别?

as
when
while
这三个词意为”当～的时候时”有什么区别?

as...as的用法
as...as意为"和……一样",表示同级的比较.使用时要注意第一个as为副词,第二个as为连词.其基本结构为：as+ adj./ adv.+as.例如：
(1)This film is as interesting as that one.这部电影和那部电影一样有趣.
(2)Your pen writes as smoothly as mine.你的钢笔书写起来和我的一样流畅.
其否定式为not as/so +adj./ adv.+as.例如：
This dictionary is not as/so useful as you think.这本字典不如你想象的那样有用.
若有修饰成分,如twice,three times,half,a quarter等,则须置于第一个as之前.例如：
Your bag is twice as expensive as mine.你的袋子比我的贵一倍.
几个关于as...as的常见句型：
(1)as...as possible
Please answer my question as soon as possible.请尽快回答我的问题.
(2)as...as usual/before
She looks as pretty as before.她看起来和以前一样漂亮.
(3)as long as...(引导条件状语从句)
It took us as long as three years to carry out the plan.我们花了长达三年的时间才完成这项计划.
(4)as far as
He walked as far as the railway station yesterday evening.昨天傍晚,他一直散步到火车站.
(5)as well as
She cooks as well as her mother does.她烧菜烧得跟她母亲一样好.
一些带有as...as结构的常见短语归纳：
as busy as a bee像蜜蜂一样忙碌
as easy as ABC像ABC一样容易
as deep as a well像井一样深
as light as a feather像羽毛一样轻
as soft as butter像黄油一样软
as rich as a Jew像犹太人一样富裕
when,while和as的区别：when引导的从句的谓语动词可以是动词,又可以是瞬时动词.并且when有时表示“就在那时”.例如：
When she came in,I stopped eating.她进来时,我在吃饭.(瞬时动词)
When I lived in the countryside,I used to carry some water for him.当的住在农村时,我常常为他担水.（动词）
We were about to leave when he came in.我们就要离开,就在那时他进来了.
While引导的从句的谓语动作必须是,并强调主句和从句的动作同时发生（或者相对应）.并且while有时还可以表示对比.例如：
While my wife was reading the newspaper,I was watching TV.(was reading和was watching同时发生)
I like playing football while you like playing basketball.我喜欢踢足球,而你喜欢打篮球.（对比）
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