Premise: "A man in a parking lot with the tailgate of his truck down so he can sit on it."\nHypothesis: "A man is standing on the roof of his truck."\nDo we know that the hypothesis entailed by the premise?
Step-by-step reasoning:
no
The man can not be on the tailgate and on the roof of his truck simultaneously.

The man can not be both sitting and standing.

.

Final answer: no