sentence: A boy is standing on a court holding a racquet in his right hand, a ball comes his way and he hits it very hard. sentence: The boy walks towards the left and a man is there hitting the ball and he and the boy go back and forth taking turns hitting the ball very hard against the wall in front of them. sentence: The ball rolls on the ground, the boy picks it up and hits it to the wall and once more the man hits the ball and the camera points to the ground.