Instructions: Given a premise, an initial context, an original ending, and a new ending, the task is to generate the counterfactual context that is aligned with the new ending. Each instance consists of a five-sentence story. The premise is the first sentence of a story, and the second sentence, which is the initial context, provides more information about the story's context. The original ending is the last three sentences of the story. Also, you are given a new ending that can provide the new story with the same premise. You should write a counterfactual context to explain the small differences between the original and new endings. More specifically, a story context contains the general plot of the story. And a counterfactual context is a slight modification to the initial context. To sum up, you should write the second sentence of a story based on the premise(first sentence) and the new ending(last three sentences) of the story.
Input: Premise: Sam decided he wanted to ride his bike to work to get some exercise.
Initial Context: Sam didn't often ride his bike and had forgotten how to use the gears.
Original Ending: Getting to work was simple since it was all down hill. Going home was difficult since the ride was all uphill. He arrived home exhausted and decided to practice gear-shifting.
New ending: Getting to work was difficult since it was all down hill and scary. Going home was easier since the ride was all uphill and he could walk it. He arrived home exhausted and decided to practice bike-riding.
Output:
Sam didn't often ride his bike and had forgotten how and kept falling off.