Premise & hypothesis.
Man in all black with buzzed black hair and black earring stands with his right knee up and right hand on his knee and belts out into a microphone.

The singer's mouth is closed.
++++++++++
true or not.
no

Premise & hypothesis.
A lone musician in black is on stage, playing an acoustic guitar and singing into a microphone.

A musician performs at a concert.
++++++++++
true or not.
it is not possible to tell

Premise & hypothesis.
Skateboarder not wearing a shirt does a cool trick.

Skateboarder not wearing a shirt does a cool trick.
++++++++++
true or not.
yes