An overweight man and a woman are outside listening to a thinner man read from a book on a partly cloudy day .
It is certain that a man and his wife are listening to their son read them a story at a picnic .
It is impossible that a man and his wife are listening to their son read them a story at a picnic .
It is certain that a man and his wife are listening to their son read them a story at a picnic .
A man and his wife are listening to their son read them a story at a picnic .