while主句和從句的時態

1、由when引導的時間狀語從句，主句用過去進行時，從句用一般過去時。如：

When he was still a little boy,Jack London wrote some compositions which were praised by his teachers.傑克·倫敦還是小孩時，他寫的一些作文就受到老師的讚賞。

2、while通常用在事情同時發生的情況，主句和從句都用過去進行時。如：

Mother was cooking the meal while i was doing my homework。我做作業時，媽媽正在做飯。

She got married while she was working as a waitress。她在飯店當服務生期間結婚了