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: My parents took us to City Point in 1959. 
 Initial Context: It was a section of South Boston by the ocean. 
 Original Ending: Some people called it Castle Island. We played by the water and bought hot dogs from the concession stand. We took the bus home at night. 
 New ending: Some people called it Castle Island. We played by the water and bought hot dogs from the concession stand. We drove home at night. 

SOLUTION: It was a section of South Boston by the ocean that we drove through.

PROBLEM: Premise: The teacher was teaching the lesson. 
 Initial Context: All the students were listening. 
 Original Ending: Tom was thinking of a question to ask. He raised his hand. The teacher called on him. 
 New ending: Tom's friend was thinking of a question to ask. Tom's friend raised his hand. The teacher called on him. 

SOLUTION: Tom was listening but too nervous to ask a question.

PROBLEM: Premise: Frank loved designing buildings. 
 Initial Context: He was an architect for a big firm. 
 Original Ending: He designed a huge skyscraper. He was so excited to see it finished. The construction would begin right away. 
 New ending: He designed a huge skyscraper for a class project. He was so excited to see it finished. The construction would never happen. 

SOLUTION:
He was an architectural student.

