Premise & hypothesis.
A man talks behind a podium.

A man gives a commencement speech.
++++++++++
true or not.
it is not possible to tell

Premise & hypothesis.
Two railway workers fix a train in orange vests.

Railway workers fix a train.
++++++++++
true or not.
yes

Premise & hypothesis.
A man and a young blond boy are sitting in front of a tray full of buns.

A man and a boy are seated near the buffet.
++++++++++
true or not.
it is not possible to tell