Task: Story Composition
Input (English): Premise: Rita decided to make her own bread. 
 Initial Context: She carefully made her dough, then baked it. 
 Original Ending: But after ages in the oven, it still hadn't risen! Rita suddenly smacked her forehead. She had forgotten to add the yeast! 
 Counterfactual Context: She couldn't get her dough to rise, so then she bought some.
Output (English): She put it in the toaster. Rita suddenly smacked her forehead. She had forgotten to buy butter!