Question:
Premise: Fans at a concert helping the lead singer sing his song.

Hypothesis: People at an event are helping out with song writing.
Is the hypothesis true?

Answer:
yes

Question:
Premise: Several men, including one in a uniform with a white hat, are looking down a busy street as a pedestrian and pedaled passenger vehicle go by.

Hypothesis: The men are wearing hats.
Is the hypothesis true?

Answer:
it is not possible to tell

Question:
Premise: A man and a woman are adjusting a costume headpiece on a brown and white cow.

Hypothesis: Two guys tipping a cow over for fun.
Is the hypothesis true?

Answer:
no