when和while用法的区别？
when和while的区别是：when只能用于一般时态
while可以用于进行时态
as和just as的区别是：
as有多种词性
just as只有一种词性，就是副词。
但是意思上是很接近的。when conj. 在...的时候 , 当…的时候
when 在绝大多数情况下，所引导的从句中，应该使用非延续性动词（也叫 瞬间动词）
例如：I'll call you when I get there. 我一到那里就给你打电话
I was about to go out when the telephone rang.我刚要出门，电话铃就响了。
但是，when 却可以 be 连用。
例如：I lived in this village when I was a boy. 当我还是个孩子的时候我住在这个村庄里。
When I was young, I was sick all the time. 在我小时候我总是生病
while 当...的时候
While he was eating, I asked him to lend me $2. 当他正在吃饭时,我请他借给我二美元。
While I read, she sang. 我看书时，她在唱歌。
while 的这种用法一般都和延续性动词连用
while 可以表示“对比‘，这样用有的语法书认为是 并列连词
Some people like coffee, while others like tea. 有些人喜欢咖啡, 而有些人喜欢茶。
as 当...之时 ，一边......一边.......
I slipped on the ice as I ran home. 我跑回家时在冰上滑了一跤
He dropped the glass as he stood up. 他站起来时，把杯子摔了。
She sang As she worked. 她一边工作一边唱歌。
just as 正像，就像，就......的样子
例如：It is just as you said.
Leave exerything just as you find it.
一般来说 as 后面即可以跟延续性动词，也可以跟非延续性动词。
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.
当她在用打字机打那封信时，电话响了。
在这三个词当中，as 的用法最多，没有什么更好的办法，只有经过大量的阅读及应用，才是掌握词汇的最好办法，一蹴而就的办法应该是没有的。
是否可以解决您的问题？
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