Anonymous Could you please explain the difference between them? Other than the one-hour difference, I assume. He will be tired because he'll have been exercising for three hours says that he will be tired after he has exercised for three hours.
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AnonymousCould you please explain the difference between them?Other than the one-hour difference, I assume.
Anonymouswhat is the difference between these two?He'll be tired because he'll be exercising for 2 hours.
AnonymousIs it possible that he'll still be exercising at that moment of his tiredness?Yes. Common sense, and not grammar, tells us that he will be getting more and more tired as he exercises, starting from the time when he begins to exercise. As the exercise continues, the tiredness will increase.