邢睿婷黑龙江省 大庆市2017/12/30 10:00:58（1）when表示两个动作同时发生或之后发生，常与瞬时动词和延续性动词连用；while表示两个动作同时发生，常与延续性动词连用。
（2）只能使用be about to ... when...;
（3）when 和 while都可表示虽然 ... 但是...。
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李娟内蒙古 乌海市2017/12/30 11:24:58when 当什么时 可表瞬间 事情可同时 或者先后发生
例子
it was snowing when we got to the airport 我们到机场时 天在下雪(先后顺序)
while 用于相伴发生的 同时进行
例子
some students were reading while others were writing
有些学生在读书 有些在写.
①when是at or during the time that, 既指时间点，也可指一段时间，while是during the time that，只指一段时间，因此when引导的时间状语从句中的动词可以是终止性动词，也可以是延续性动词，而while从句中的动词必须是延续性动词。
②when 说明从句的动作和主句的动作可以是同时，也可以是先后发生；while 则强调主句的动作在从句动作的发生的过程中或主从句两个动作同时发生。
③由when引导的时间状语从句，主句用过去进行时，从句应用一般过去时；如果从句和主句的动作同时发生，两句都用过去进行时的时候，多用while引导，如：
a. When the teacher came in, we were talking.
当此句改变主从句的位置时，则为：
While we were talking, the teacher came in.
b. They were singing while we were dancing.
④when和while 还可作并列连词。when表示“在那时”；while表示“而，却”，表对照关系。如：
a. The children were running to move the bag of rice when they heard the sound of a motor bike.
孩子们正要跑过去搬开那袋米，这时他们听到了摩托车的声音。
b. He is strong while his brother is weak.
他长得很结实，而他弟弟却很瘦弱
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刘延群陕西省 宝鸡市2017/12/30 11:24:581 when可以指动作一前一后发生（主从复合句中的动词都为瞬间动词），也可以指一个动作
发生在另外一个动作之间（主从复合句的动词一个是瞬间动词一个是延续性动词）。
The train had left when I got to the station.
I met one of my old friends when I was walking in the street yesterday.
而while引导的主从复合句则通常都为延续性的动词，因而常常使用进行时态。
My mother was cooking while my father was watching TV.
One boy is rowing while the other boy in the boat is dangling around his
legs in the cool water of the lake.
一个男孩正在划船，而船里的另一个男孩则把腿悬垂在凉爽的湖水中。
2 when 可以用于 be about to do sth. when ...的固定结构当中
I was just about to call you when you called me.
3 while 可以表示对比关系“然而”
He is short while his brother is tall.
Tom has opened his own business while his classmates are still slogging
away at school.
当汤姆的同学还在学校苦读时，他已经开始了自己的事业。
4 while还可以引导让步状语从句“尽管”
While everyone else wouldn't go to the mountain area, he went without a
second thought.
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