Task: Story Composition
Input (English): Premise: Sue happened to look outside her window. 
 Initial Context: There was a horse looking back at her. 
 Original Ending: She didn't have a horse. As she walked outside she was a man coming towards the house. His horse had gotten out of the pasture, wandering into Sue's yard. 
 Counterfactual Context: There was a dog looking back at her.
Output (English): She didn't have a dog. As she walked outside she was a man coming towards the house. His dog had gotten out of his yard, wandering into Sue's yard.