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when while as 表示当的意思,有什么区别?简洁的区别

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when while as 表示当的意思,有什么区别?简洁的区别
When的范围i比较大,可以指接延续和非延续动词,When i got there ,he had gone.
When i was walking on the street ,i met an old friend.
此外when 还可以“就在那时” I was walking in the forest when a lion appeared in front of me.
While 所引导的时间状语从句必须谓语动词是延续的,并且强调在此期间.如 While he was reading ,the electricity was cut off.
As 所引导的时间状语从句主要强调“随着”或“一边.一边”如:As time goes by ,i love you more and more.As they were walking ,they were singing.