Task: Story Composition
Input (English): Premise: I was walking my dog. 
 Initial Context: My dog spotted another dog in the distance. 
 Original Ending: My dog suddenly leaped forward. The leash snapped in half! My dog ran away and I lost him. 
 Counterfactual Context: My dog is usually well behaved so I didn't have him on a leash.
Output (English): My dog suddenly leaped forward. If I had had him on a leash it would have snapped in half! My dog ran away and I lost him.