Premise: A man and a woman sit in front of a computer and other equipment looking at various scenes on the monitor.

Hypothesis: Man and woman monitoring screens
yes

Premise: A tennis player in mid game holding a racquet.

Hypothesis: a man playing tennis
it is not possible to tell

Premise: There is a man with a fedora hat and blue dress coat playing an accordion in front of a sign.

Hypothesis: There is a man with no hat.
no

Premise: A man in gray short with black stripes near the top of the waistband is lifting weights.

Hypothesis: The man is not wearing a shirt.
it is not possible to tell