Task: Story Composition
Input (English): Premise: Tom bought two female mice last week. 
 Initial Context: He named them Salt and Pepper. 
 Original Ending: He forgot to close their cage yesterday. Tom thought he had lost his new pets. He found them in the pantry later that night. 
 Counterfactual Context: The were both white.
Output (English): He forgot to feed them yesterday. Tom thought he would lost his new pets. He found them starving.