We were about to start when it began to rain. 我们正要出发,这时天开始下雨了。
He likes coffee, while she likes tea. 他喜欢咖啡,而她却喜欢茶。
(9)
as 和 when 后均可直接跟一个名词,构成省略句,但 while 一般不这样用:
As [When] a boy, he lived in Japan. 他小时候在日本。
(10)
when 和 while 后可接现在分词、介词短语、形容词等构成省略句,但 as 一般不这样用:
When [While] reading, he fell asleep. 他看书时睡着了。
When [While] in trouble, ask her for help. 遇到麻烦的时候你就去找她帮忙。
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