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TAKE AN EXAMPLE-He will be tired because he will be exercising so hard

He will be tired because he will have been exercising so hard.

BOTH REPRESENT THE SAME MEANING BUT THERE'S A DIFFERENCE WHICH I DON'T KNOW.

PEOPLE USUALLY DO MISTAKES WHEN TO USE CONTINUOUS AND PERFECT CONTINUOUS TENSE

WHAT ARE THE CONDITIONS THERE TO USE THESE TENSES
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Please do not use all capitalize letters. It means you are shouting, and it is rude.

Thank you.