Premise & hypothesis.
Teenagers play instruments in an orchestra.

A boy plays harmonica.
++++++++++
true or not.
no

Premise & hypothesis.
A group of firefighters are looking up in the air.

Firefights gaze skyward
++++++++++
true or not.
yes

Premise & hypothesis.
Two men in a city working at a construction site, with tall buildings behind them.

Two man are at work in the city.
++++++++++
true or not.
yes