Task: Story Composition
Input (English): Premise: Martha had a dog named Butch. 
 Initial Context: Butch would lie all day on the sofa like a lazy dog. 
 Original Ending: Martha came home one day with a cat. Butch woke up from his slumber and lept from the sofa. Butch grabbed the cat and shook it, and killed the cat. 
 Counterfactual Context: Butch is always in the cage sleeping.
Output (English): Martha came home one day with a cat. Butch woke up from his slumber and lept up and down. A robber grabbed the cat and shook it, and killed the cat.