Task: Story Composition
Input (English): Premise: Ben and his friends were sitting on top of a hill. 
 Initial Context: Ben sat down on his skateboard and sped down the hill. 
 Original Ending: When he reached the bottom his friends said they wanted to try too. His friend began to copy Ben but slipped off halfway down the hill. He hurt his arm badly and Ben and his friends called an ambulance. 
 Counterfactual Context: Ben got up and walked down the hill.
Output (English): When he reached the bottom his friends said they wanted to walk too. His friend began to copy Ben but tripped off halfway down the hill. He hurt his face badly and Ben and his friends called an ambulance.