Task: Story Composition
Input (English): Premise: Sam got a new winter hat. 
 Initial Context: It was a present from his girlfriend. 
 Original Ending: Sam wore his new hat while snowboarding. His friends complimented his hat. Sam thanked his girlfriend for giving him such a wonderful present. 
 Counterfactual Context: His mom got him the hat for his birthday.
Output (English): Sam wore his new hat while snowboarding His friends complimented his hat Sam thanked his mom for giving him such a wonderful present.