Task: Story Composition
Input (English): Premise: Tom loved swimming. 
 Initial Context: One day he tried to beat his personal best. 
 Original Ending: He swam as fast as he could in the left lane. He kicked hard and pushed himself fast. The best his record by 2 seconds! 
 Counterfactual Context: One day he decided to start water skiing instead.
Output (English): He rode as fast as he could in the water. He pushed himself fast. He beat his record by 2 seconds!