Task: Story Composition
Input (English): Premise: One night while walking my girlfriend home, she saw a strange shape. 
 Initial Context: I looked and realized that it's an opossum. 
 Original Ending: We went running after it. When we caught up, it stopped and stared at us. We took a few photos and then let it go on its way. 
 Counterfactual Context: I looked and realized that it's a tree.
Output (English): We went running after it. When we reached the tree,we realized it was very ancient. We took a few photos and then went on our way.