Anchor: the boy laying face down on a skateboard is being pushed along the ground by another boy.
Entailed: Two boys are playing with a skateboard.
Contradiction: Both boys are in timeout.
Contradiction: A man in jeans and a red t-shirt just dropped his food on the street.
Contradiction: The man is outside.
Contradiction: A group of four men are out to dinner.
Contradiction: The climber is climbing up the rocks.