Task: Story Composition
Input (English): Premise: Mitchell has always been good at basketball. 
 Initial Context: He decided that he wanted to play football instead. 
 Original Ending: Mitchell learned everything he could about the new sport. He practiced every day. Now, Mitchell is just as good at football as he was at basketball. 
 Counterfactual Context: He decided he wanted to take on chess instead.
Output (English): Mitchell learned everything he could about the new game. He practiced every day. Now, Mitchell is good at chess and basketball.