Premise & hypothesis.
A bike mechanic is working on fixing his bike before the big race.

A man was riding a bike.
++++++++++
true or not.
no

Premise & hypothesis.
A man becomes engulfed in his book.

A woman is engulfed in her book.
++++++++++
true or not.
no

Premise & hypothesis.
A young woman in a blue uniform takes digital photographs while three older woman look on.

A young woman practices her photography skills while three old women watch her.
++++++++++
true or not.
it is not possible to tell