A young boy in a t-shirt , sweats and a red hat , skateboarding in a skateboard arena , with an audience on the side and blue skies above .
It is impossible that some of the audience do not watch the skateboarder .
It is impossible that some of the audience do not watch the skateboarder .
It is certain that some of the audience do not watch the skateboarder .
Some of the audience do not watch the skateboarder .