Yes, you can say either. shtml ]HERE[/url] for further explanation.
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Johnson13 I think WHILE HE WAS WAITING is better, what do you think?I don't think it's better.
Johnson13does this sentenceThe cab driver left the meter running while he waited for us.sound natural to you?Yes. It sounds natural. You often see the past continuous ('was waiting') after while, but the simple past ('waited') is also good. while has the property of forcing a 'continuous' (i.e., 'imperfective') reading on the following verb.