Task: Story Composition
Input (English): Premise: Henry wanted a cell phone for Christmas, nothing else. 
 Initial Context: On Christmas morning there was only one box left to open. 
 Original Ending: It was too big to be a phone. But when he opened it, there was a phone inside. His parents had used a big box so he couldn't guess what was inside. 
 Counterfactual Context: On Christmas morning there was only an envelope left to open.
Output (English): It was too small to be a phone. When he opened it, there was a coupon for a phone inside. His parents had used an envelope so he couldn't guess what was inside.