Task: Story Composition
Input (English): Premise: Tommy was a young boy. 
 Initial Context: He had been a very good boy this year. 
 Original Ending: He asked Santa for a brand new bike for christmas. Christmas morning comes and tommy runs down the stairs. Tommy is so happy to see his brand new bike under the tree. 
 Counterfactual Context: He had been a very good boy but didn't believe in Santa.
Output (English): He asked his parents for a brand new bike for christmas. Christmas morning comes and tommy runs down the stairs. Tommy is so happy to see his brand new bike under the tree.