Given the task definition and input, reply with output. Given a sentence, generate a most likely context or previous statement. The previous statement should be relevant to the given statement.

A taller boy is standing and walking near the boy sitting on the chair and he has a green plastic bag over his left hand that he's moving back and forth with a twist of his wrist.
In the background a boy on a white chair is gently tossing a ball in the air above his lap.