Anchor: a boy is pulling a small tree while he skis
Entailed: A boy is pulling a tree.
Contradiction: The boy is on skates.
Contradiction: A woman is vacuuming the floor.
Contradiction: A man has a saw in his hands
Contradiction: She was expecting the man next to her to speak and wasn't surprised when he did. 
Contradiction: There are a lot of gossip about Viagra.