TAKE AN EXAMPLE-He will be tired because he will be exercising so hard<br/><br/>He will be tired because he will have been exercising so hard.<br/><br/>BOTH REPRESENT THE SAME MEANING BUT THERE'S A DIFFERENCE WHICH I DON'T KNOW.<br/><br/>PEOPLE USUALLY DO MISTAKES WHEN TO USE CONTINUOUS AND PERFECT CONTINUOUS TENSE<br/><br/>WHAT ARE THE CONDITIONS THERE TO USE THESE TENSES