The boy in gray is taking pictures of his friend in the striped sweatshirt doing tricks on his skateboard .
It is probably not the case that a skateboarder tries out a new trick while his friend takes pictures .
We believe that a skateboarder tries out a new trick while his friend takes pictures .
It is probably not the case that a skateboarder tries out a new trick while his friend takes pictures .
A skateboarder tries out a new trick while his friend takes pictures .