Premise & hypothesis.
Four girls eat breakfast at a convention.

Four girls eat a vegetarian breakfast at a vegetarian convention.
++++++++++
true or not.
it is not possible to tell

Premise & hypothesis.
A person on a tree-lined hill, in winter, with a backpack and ski poles.

A person is riding a surfboard.
++++++++++
true or not.
no

Premise & hypothesis.
Young girl in wading pool with onlooker in red shirt and backpack standing on the side

A person watches a girl in a pool
++++++++++
true or not.
yes