I was studying and studying for hundreds of hours. (0:57 in the video below)
https://www.englishcoachchad.com/p/action
Is the above sentence acceptable to native speakers?
Yes.
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TeoI was studying and studying for hundreds of hours. ...
Is the above sentence acceptable to native speakers?
To most of them I'd say. Nevertheless, personally I am somewhat dissatisfied with the combination of past continuous with a for-phrase that gives an amount of time. I prefer the past simple in this pattern.
I studied (and stud