Anchor: A blue ski boat is on its trailer in the driveway with a person in the front of the boat.
Entailed: Somebody is pulling a ski boat on a trailer.
Contradiction: A canoe is on a trailer in the driveway.
Contradiction: the boat has sunk in the ocean
Contradiction: A red ski boat is on its trailer in the driveway.
Contradiction: A red ski boat is on a trailer at a park.
Contradiction: The ski boat is inside of a house.