Task: Story Composition
Input (English): Premise: A man went to the library to borrow a book. 
 Initial Context: He could not remember the name of the book. 
 Original Ending: He did however, recall that the book was made into a movie. The man tried to sing the movie theme song to the librarian. The librarian quickly was able to figure out the book. 
 Counterfactual Context: He remembered the exact book he wanted.
Output (English): The librarian told him that the book was made into a movie. The librarian tried to sing the movie theme song to the man. The man quickly left the library with the book.