Task: Story Composition
Input (English): Premise: Tom wanted a new hobby. 
 Initial Context: He bought a bicycle. 
 Original Ending: He took the bicycle to the nearest trail. He had a lot of fun riding the trail. Tom knew he had found his new hobby. 
 Counterfactual Context: He bought a video game system.
Output (English): He took the portable system to the nearest trail. He had a lot of fun walking the trail while playing. Tom knew he had found his new hobby.