TASK DEFINITION: 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.
PROBLEM: Premise: Allison bought herself a new treadmill.
Initial Context: She hopped on for the first time and started experimenting.
Original Ending: She kept going faster and faster on the treadmill. Eventually, she couldn't run fast enough. Allison fell off the back of the treadmill and slammed onto the floor.
New ending: Her friend tried it and kept going faster and faster on the treadmill. Eventually she couldn't run fast enough. The friend fell off the back of the treadmill and slammed onto the floor.

SOLUTION: Allison never used it.

PROBLEM: Premise: When Mark was in first grade he slipped off the jungle gym at school.
Initial Context: As he hit the ground, Mark felt a sharp pain his his left wrist.
Original Ending: Mark's teacher sent him to the school nurse. The school nurse could tell his arm was broken and called Mark's mom. She took him to the doctor to get a bright orange cast.
New ending: Mark's teacher sent him to the school nurse. The school nurse could tell his ankle was broken and called Mark's mom. She too him to the doctor and he got a bright orange cast on his ankle.

SOLUTION: As he hit the ground, Mark felt a sharp pain his his left ankle.

PROBLEM: Premise: Dan did not know how to do his homework.
Initial Context: Dan did his homework without asking anyone how to do it.
Original Ending: At school Dan go an F when he received his homework. Dan came home crying and showed it to his parents. The next time Dan couldn't understand his homework he asked for help.
New ending: At school Dan got an A when he received his homework. Dan came home happy and showed it to his parents. The next time Dan couldn't understand his homework he asked for help.

SOLUTION:
Dan chose to speak with the professor and get some additional tutoring to ensure his work was correct.