Task: Story Composition
Input (English): Premise: I was drinking some soda out of a cup. 
 Initial Context: I set the cup on my desk next to another cup, which contained water. 
 Original Ending: I got thirsty and picked up a cup to take a drink. It tasted weird! I had expected soda, but drank the water by mistake. 
 Counterfactual Context: I dropped my cup near my desk.
Output (English): I got thirsty and bought a new cup to take a drink. It tasted weird! I had expected soda, but bought water by mistake.