1. as和when之后均可直接跟一个名词,构成省略句;但是while一般不这样用。如:
As [When] a boy, he lived in Japan. 他小时候在日本。
As [When] still a student, he wrote a novel. 当他还是个学生的时候,他就写了一本小说。
2. when和while之后可接现在分词、介词短语、形容词等构成省略句,但as一般不这样用。如:
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。
You must study hard while young, or you will regret when old. 你趁年轻时必须努力学习,不然到老了你会后悔的。
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