时间状语从句as,while,when怎么区别____ (As) they were enjoying exploring,the crowd of people became larger and larger. 第一题为什么用as,不用while / when?_______(While / When)the crowd was pushing Darren in all directions,someone ste

时间状语从句as,while,when怎么区别____ (As) they were enjoying exploring,the crowd of people became larger and larger. 第一题为什么用as,不用while / when?_______(While / When)the crowd was pushing Darren in all directions,someone ste
时间状语从句as,while,when怎么区别
____ (As) they were enjoying exploring,the crowd of people became larger and larger.
 第一题为什么用as,不用while / when?
_______(While / When)the crowd was pushing Darren in all directions,someone stepped on his feet.
 第二题为什么可以用while/when,但是不能用as?
_______(When)  Darren finally pushed his way out,he couldn't find his two friends.
什么用when?为什么不用as?
 
请针对我提出的三个具体问题给出答案，而不是复制、粘贴一些语法的解释，

时间状语从句as,while,when怎么区别____ (As) they were enjoying exploring,the crowd of people became larger and larger. 第一题为什么用as,不用while / when?_______(While / When)the crowd was pushing Darren in all directions,someone ste
第一题,as,when都可以引导原因状语从句,而while不可以,表示原因时,as表示“因为”,而when表示”既然“,显然既然在这里说不通,as为最佳答案.
第二题,as引导时间状语从句时,强调主从句的动作同时发生,强调两个动作同时进行.
when和while就没有这个限制了.

when 可以表示一段时间和一个时间点。while 表示一个时间段，不表示时间点，在表示时间段时，动词是个可以延续的动作。表示时间段的时候动词when 和whil 可以互换。 as 强调的时过程。
如 when , as , while 这三个词都可以引出时间状语从句，它们的差别是：when 从句表示某时刻或一段时间 as 从句表示进展过程，while 只表示一段时间
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when 可以表示一段时间和一个时间点。while 表示一个时间段，不表示时间点，在表示时间段时，动词是个可以延续的动作。表示时间段的时候动词when 和whil 可以互换。 as 强调的时过程。
如 when , as , while 这三个词都可以引出时间状语从句，它们的差别是：when 从句表示某时刻或一段时间 as 从句表示进展过程，while 只表示一段时间
When he left the house, I was sitting in the garden.

当他离开家时，我正在院子里坐着。

When he arrived home, it was just nine o'clock.

当他到家时，正是九点钟。

As he grew older, he became more intelligent.

随着他年龄的增长，他变得更有才智了。

While he was in London,he studied music.

当他在伦敦时，他学习音乐。

While she was typing the letter,the telephone rang.
as强调过程，when while 强调与此同时的时间，此时此刻。譬如最后，当他最后pushed his way out的这一时刻，他发现找不到他两个朋友了。as是随着某一，，怎样怎样

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