Premise: "A man riding a wakeboard on a lake."\nHypothesis: "A man is having lots of fun on the wakeboard."\nDo we know that the hypothesis entailed by the premise?
Step-by-step reasoning process below:
it is not possible to tell
Just because he is riding a wake board does not mean he is having lots of fun and one can have fun without a wake board.

.

Thus, the answer is it is not possible to tell