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4. when; while; as
when, while和as都有\"当......之时\"之意，区别在于：
when从句的谓语动词可以是瞬间性的（get up, arrive, start等），也可以是持续性的（be, stay, wait, live等）。如：
It was raining when we started.
I lived in this village when I was a boy.
while从句中的动词必须是持续性的。当when从句中的动词是持续性动词时，就可以用while来代替when。
as从句强调从句的动作与主句的动作同时进行，可译为\"一边......一边......\"或\"随着......\"。如：
He sang songs as he was taking a bath.
As she grew older, she became more beautiful.
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