He entered the room when (while, as) the meeting was going on.
正当开会的时候他走进了房间。
She entered the room when (while, as) the meeting was going on.
正当开会的时候她走进了房间。
As (When, While) we were still laughing, the teacher came in.
我们还在大笑时，老师进来了。
As (When, While) I was walking to school, I saw Mr. Johnson.
我走向学校时，见到了约翰逊先生。
Jim hurt his arm while [when, as] he was playing tennis.
吉姆打网球时把手臂扭伤了。
While/ When/ As I was sweeping the floor, I found your pen.
我扫地的时候，发现了你的钢笔。
As [When, While] she was waiting for the train, she became very impatient.
她在等火车时，变得很不耐烦。
When you go away, after a while I don't miss you as much.
当你离开一会后，我就不再想你想得那么厉害了。
Her voice trembled as (while, when) she spoke.
她讲话时，声音发颤。
While/ / When/ As I was sweeping the floor, I found your pen.
我扫地的时候，发现了你的钢笔。 。
When/While/As we were dancing, a stranger came in.
我们正跳舞时，一个陌生人走进来了。
He sang as (while, when) he worked.
他一边干活，一边唱歌。
While (When, As) he stood there, he saw two men enter the bar.
他站在那儿时，看见两个男人进了酒吧。
When /While /As she was making a phone call, I was writing a letter.
（make为延续性动词）当她在打电话时，我正在写信。
When /While /As she was making a phone call, I was writing a letter.
（make为延续性动词）当她在打电话时，我正在写信。
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