Two people are in a river , one is a standing man and the other appears to be a child lying on his stomach with his chest and head above the water .
There is a better than even chance that a man teaches his son to swim in a river .
There is a better than even chance that a man teaches his son to swim in a river .
Chances are slight that a man teaches his son to swim in a river .
A man teaches his son to swim in a river .