简单的说when while as 的区别：例如as表示同时发生,he is singing as he is riding his bike
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简单的说when while as 的区别：例如as表示同时发生,he is singing as he is riding his bike
简单的说when while as 的区别：例如as表示同时发生,he is singing as he is riding his bike
简单的说when while as 的区别：例如as表示同时发生,he is singing as he is riding his bike
when,while和as的用法区别
①三者均可表示“当……的时候”,如果主句表示的是短暂的动作,而从句表示的是一段时间,三者可通用.如：
I met Kang Li as／when／while I was walking along the street．当我沿街散步时碰见了康丽.
②when可以和延续性动词连用,也可以和短暂性动词连用；而while和as只能和延续性动词连用.如：
It was snowing when we got to the airport．当我们到达机场时,天正下着雪.（不能用while）
③as强调主句与从句表示的动作同时发生,as常表示“随着……”；“一边……,一边……；while强调主句表示的动作持续于while所指的整个时间内；when可指主、从句所述动作同时或先后发生.如：
As the time went on,the weather got worse．（as表示“随着……”之意）
He sang as he went along．他边走边唱.
Please write while I read．我读的时候,请写下来.
When he reached home,he had a little rest．回到家后,他休息了一会儿.
④when用于表示“一……就……”的句型中（指过去的事情）.
somebody had hardly（＝scarcely） done …when．．．＝Hardly ／ Scarcely had somebody done …when．．．
①I had hardly ／scarcely closed my eyes when someone knocked at the door．＝Hardly ／ Scarcely had I closed my eyes when someone knocked at the door．我刚一闭上眼,就有人在敲门了.