Task: Story Composition
Input (English): Premise: Charles was excited about taking a road trip with his grandfather. 
 Initial Context: But he worried about his grandfather's health. 
 Original Ending: Charles heard his grandfather was in ill health with diabetes. About twelve hours into the trip they pulled into a restaurant. Charles, in amazement, watched his grandfather eat a large burger. 
 Counterfactual Context: His grandfather was in great shape and was given a doctor's OK.
Output (English): But Charles thought his grandfather was in ill health with diabetes. About twelve hours into the trip they pulled into a restaurant. Charles, in amazement, watched his grandfather eat a large burger.