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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
Comments 
Please do not use all capitalize letters. It means you are shouting, and it is rude.

Thank you.