Task: Story Composition
Input (English): Premise: Mark was severely overweight. 
 Initial Context: One day he decided he couldn't take it anymore. 
 Original Ending: He tried to go outside and run. He only did a mile and was out of breathe. However a year later he did his first marathon. 
 Counterfactual Context: One day he decided he could take more of it.
Output (English): He wouldn't even think of going outside to run. He knew if he did a mile, he would be out of breath. However a year later, he weighs more than he did the previous year.