Task: Story Composition
Input (English): Premise: The mom bought herself a bike. 
 Initial Context: Her kids liked to bike, so she decided that she would join them. 
 Original Ending: They started riding every day. They worked their way up to ten miles. Biking had become their new favorite hobby. 
 Counterfactual Context: She had never learned to ride a bike as a child.
Output (English): Once she learned how to ride a bike she started riding it every day. She worked her way up to ten miles. Biking had become her new favorite hobby.