An older man with a graying beard , possibly a homeless person , sleeps on the grass in front of an ancient tree in a public park .
It is certain that in the grass in the park there is a homeless man who is sleeping on the ground by a tree .
It is certain that in the grass in the park there is a homeless man who is sleeping on the ground by a tree .
It is probably not the case that in the grass in the park there is a homeless man who is sleeping on the ground by a tree .
In the grass in the park there is a homeless man who is sleeping on the ground by a tree .