Premise: An older woman is showing a younger woman how to play the piano

Hypothesis: There are two women playing the piano.
yes

Premise: A man wearing a red life vest waves as he waterskiis.

Hypothesis: The man is riding on an elephant while surfing.
no

Premise: A man wearing a necktie sitting down and trying to take a drink.

Hypothesis: There is someone sitting down.
yes

Premise: A blond girl sits on a white porch railing.

Hypothesis: The girl is using the railing as a balancing beam, practicing for gymnastics.
no