Task: Story Composition
Input (English): Premise: The bathroom was really dirty. 
 Initial Context: It was Marty's turn to clean it. 
 Original Ending: Unfortunately he was on vacation this week. So I had to clean it instead. He'll just clean it when it's my turn. 
 Counterfactual Context: It was my turn to clean it.
Output (English): Marty said he would do it but changed his mind. So I had to clean it instead. He'll just clean it when it's his turn.