逍遥右脑 2015-01-16 20:30
高考临近,小编为大家准备了些高考词汇的辨别,希望大家能从中获益!
8. when 可用作并列连词,表示“这时(突然)”;while 也可以用作并列连词,表示“而”、“却”(表示对比);但 as 则没有类似用法。如(www.nmet168.cn):
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 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。
10. 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 (you are) young, or you will regret when (you are) old. 你趁年轻时必须努力学习,不然到老了你会后悔的。