while是哪种时态的标志词

while可以引导时间状语从句，经常用于一般过去时，过去进行时，现在进行时，一般现在时，一般将来时都有可能

例子：

It will take a while for the drug to work out of your system.这药得需要一段时间才能排出你的体外。

I'll be back in a little while.我一会儿就回来。

You'll water the plants while I'm away， won't you?我外出的时候请你给花草浇浇水，行不行

Her parents died while she was still at school.她还在读书时父母就去世了。

He'll do the job if you make it worth his while.你要是给他的报酬丰厚，他会做这份工作的`。

Give me your hand while we cross the road.过马路时拉着我的手

while是哪种时态的标志词

可以说while是过去进行时的标志性词。例如，While I was talking on the phone， he came in.