第3个回答 2006-06-08
when通常和be about to 连用
如:I was about to go out when it began to rain.
当天开始下雨时,我正准备出门。
while通常跟进行时
as有随着——的意思
As it was getting dark,I felt very scared.
随着天渐渐黑下来,我十分害怕。
while可以表示语气转折,如:While she likes Maths,her brother prefers English.
她喜欢数学,而她的哥哥喜欢英语。
同时as放句首倒装等于though
如:As a child he is,he is very brave.
虽然他是个孩子,但他很勇敢。
还有no sooner——than,scarcely——when,hardly——when表示一怎么就怎么 如:
No sooner I got home,the phone began to ring.
我一回家,电话就响了。