while从句动态动词一般为进行时

但也有用一般时的句子

Can you wait for me while I make a call?

Can you hold my bag while I try on this jacket?

甚至在《grammar in use》里还有Alex read a book while I watched TV.如此的例句

这个语法规律我没查到,有老师解说一下吗。

Can you wait for me while I make a call?

Can you hold my bag while I try on this jacket?

注意两点:

主从句都是指“以后”动作。while 里面的动作目前未发生。

主从句两个谓语动词都是“延续性动词”时,while 从句的动词用一般体,可以表示两个动作在同时进行。(这是重点缘由)

比如:

They bandied the ball from player to player while they waited the game to start.

在等比赛开始的时候,他们把球在队员之间来回传递。

I sat on the settee to unwrap the package while he stood by

我坐在长椅上打开包裹时他就站在旁边。

《柯林斯高阶英汉双解学习词典》