Task: Story Composition
Input (English): Premise: Bill found some seeds in an old shoebox. 
 Initial Context: He didn't know what type of plant the seeds were. 
 Original Ending: He planted the seeds. After a week the seeds sprouted. It turns out that the seeds grew tomatoes. 
 Counterfactual Context: He knew the seeds would grow watermelons.
Output (English): He planted the seeds. After a week the seeds sprouted. They grew into big, beautiful watermelons.