Premise: A female swimmer coming up for air as she does the butterfly stroke.

Hypothesis: The female is playing basketball.
no

Premise: A guy is skiing in the snow.

Hypothesis: a man skiing
yes

Premise: A man with plenty of plumber's crack pounds a rock, for some unknown reason.

Hypothesis: A man is trying to break a rock.
it is not possible to tell

Premise: People buying food from an outdoor seller.

Hypothesis: People buying food.
yes