Premise & hypothesis.
Man with a white helmet and black clothing riding a dirt bike on a rocky dirt road.

A guy on a dirt bike is on a dirt road.
++++++++++
true or not.
yes

Premise & hypothesis.
A boy is doing a skateboard trick on the railing of the steps.

a boy shows his brother a skateboard trick
++++++++++
true or not.
it is not possible to tell

Premise & hypothesis.
The groom and bride are both jumping on the Great Wall of China.

The newlyweds are swimming at their hotel.
++++++++++
true or not.
no