Premise: A black male in a green t-shirt and blue jeans, playing violin while seated in a green chair.

Hypothesis: a man is practicing for a symphony
it is not possible to tell

Premise: The skateboarder in the white shirt balances on the ledge as the others look on in the background.

Hypothesis: a man is skating
yes

Premise: Two female baseball players reach for the ball.

Hypothesis: the players are flying a plane
no

Premise: Two young boys are in the water.

Hypothesis: Two young boys are swimming.
yes