Task: Story Composition
Input (English): Premise: Greg saw a mouse in his kitchen. 
 Initial Context: He went out and bought a cat to catch it. 
 Original Ending: He waited and waited but saw no dead mouse. Thinking his cat was useless he almost returned it. Finally, he woke up in horror to see a dead mouse on his pillow. 
 Counterfactual Context: He went out and bought a humane trap, caught the mouse and put it out in a field.
Output (English): He waited and waited but the mouse wouldn't leave. Thinking the mouse was stupid he almost returned it. Finally, he noticed in horror to see the mouse was dead.