Task: Story Composition
Input (English): Premise: A little boy was searching for his ball. 
 Initial Context: He looked all over but couldn't find it. 
 Original Ending: He ran into a tiny dog. The dog was holding something. It was the boy's ball! 
 Counterfactual Context: He found it on the porch.
Output (English): He ran into a tiny dog. The dog was holding something. It was a large bone!