Task: Story Composition
Input (English): Premise: Dennis taped a trash bag over his broken window. 
 Initial Context: The trash bag blew off in the wind. 
 Original Ending: Rain got in through the broken window. The carpet grew mildew. Dennis had to replace the carpet. 
 Counterfactual Context: The trash bag held together air tight.
Output (English): Rain didn't get in through the broken window. The carpet didn't grow mildew. Dennis didn't have to replace the carpet.