Question

英语关于连词、从句的问题以前老师告诉我while前后的句子时态都要是ing,也就是进行时,但是我有时候看见由while连

Answer 1

while 引导时间状语从句的时候,一般是这样的,比如：

While John was watching TV, his wife was cooking.

I got home while dad was reading newspaper.

担不全部是.比如：

While he was a young boy, he was always ready to help others.

Will you watch my clothes while I have a swim.

在 while 引导让步从句的时候,不一定用现在进行时：

I like playing football while you like playing basketball.

上面是比较明显的.你有兴趣的话,到下面链接看看吧：

http://baike.baidu.com/view/84572.htm