A guy in a white shirt , sunglasses and black pants is riding his skateboard on a street with a lot of trees in the background .
It is certain that a skateboarder rides on a tree-lined street .
It is certain that a skateboarder rides on a tree-lined street .
Chances are about even that a skateboarder rides on a tree-lined street .
A skateboarder rides on a tree-lined street .