Premise & hypothesis.
A long-haired man stands at a microphone playing a pink Hello Kitty guitar.

A man is playing a typical guitar.
++++++++++
true or not.
no

Premise & hypothesis.
Someone showing a woman how to use a self checkout machine.

a woman buying groceries
++++++++++
true or not.
it is not possible to tell

Premise & hypothesis.
A man rides a bicycle on a rocky path beside a lake in the mountains.

man on bike
++++++++++
true or not.
yes