Task: Story Composition
Input (English): Premise: I think about balls all the time. 
 Initial Context: I used to have small and large balls. 
 Original Ending: Once, a large ball got stuck in a tree. I took a small ball and used it to get the big ball down. I only throw the small balls at the trees, now. 
 Counterfactual Context: I used to have no balls.
Output (English): Once, I got greedy and got a large ball got stuck in a tree. I took a small ball and used it to get the big ball down. I only throw the small balls at the trees, now.