A young man wearing blue jeans and a t-shirt sits in the grass , with a ball in the air .
The young man is throwing a ball .
A young man wearing blue jeans and a t-shirt sits in the grass, with a ball in the air.
The young man is throwing a ball.
The words ' a ' and ' the ' are often interchangeable in many situations.
The words ' a ' and ' the ' are often interchangeable in many situations .