as soon as ,when,while 什么区别

1.as soon as一经...;立即...;一...就...
Come here as soon as you finish the work.
工作一结束你就到这里来.
2.while 意为 during the time that“在……期间”,表达一个“时间段”,不能表达“时间点”,从句的动词只限于持续性动词.例如：
One day while he was shopping in the supermarket,he saw his ex-wife with a man.
一天,他在超市购物时,他看到了他的前妻和一个男子在一起.
Strike while the iron is hot.
趁热打铁.
3、when 意为 at the time that“在…时”,多指“时间点”,例如：
When he returned from work,his wife was cooking.
他下班回家时,他的妻子正在做饭.