Premise: Two young men are having good time.

Hypothesis: two men enjoy their company
yes

Premise: Three asian children, 2 boys and a girl, is sitting and studying in a classroom that is painted light green.

Hypothesis: Three children are studying for a big test.
it is not possible to tell

Premise: Man and woman repairing automobile brakes.

Hypothesis: The woman is fixing the headphones.
no

Premise: Two people wearing viking helmets.

Hypothesis: The people are in viking costumes.
it is not possible to tell