Task: Story Composition
Input (English): Premise: The cat was laying on the window sill. 
 Initial Context: The cat saw a ball on the floor. 
 Original Ending: The cat had never seen a ball. The cat got down and swatted the ball. The cat liked playing with the ball. 
 Counterfactual Context: The cat saw a rat run across the floor.
Output (English): The cat had never seen a rat. The cat got down and swatted the rat. The cat liked playing with the rat.