Premise: a man with a green hat& jacket sitting on the sidewalk playing a guitar.

Hypothesis: The man is begging for money.
it is not possible to tell

Premise: dirt bike racer

Hypothesis: Dirt bike racer is racing with friends.
it is not possible to tell

Premise: Man with visible underwear examines sidewalk.

Hypothesis: A man is looking at the sky.
no

Premise: A girl in a yellow shirt walks with her hands in her pocket on a bridge.

Hypothesis: A woman is walking over a river.
it is not possible to tell