The white dog is chasing a toy that is attached to a string across the grass .
There is a better than even chance that a boy is running across the grass with his pet 's toy on a string .
There is a better than even chance that a boy is running across the grass with his pet 's toy on a string .
It is highly unlikely that a boy is running across the grass with his pet 's toy on a string .
A boy is running across the grass with his pet 's toy on a string .