Task: Story Composition
Input (English): Premise: Cass loved sweet potatoes. 
 Initial Context: His mom would always make them for him. 
 Original Ending: However, he could not cook them. He tried a recipe and they never came out right. Cass finally gave up. 
 Counterfactual Context: His mom taught him how to make them so he cooked them himself.
Output (English): He could cook them. He tried a new recipe and they came out right. Cass was pleased.