Task: Story Composition
Input (English): Premise: An barn owl used to live in the tree in our yard. 
 Initial Context: At night, the owl would fly from its perch. 
 Original Ending: It swooped over the yard looking for mice. The owl would catch mice for its babies. Eventually we cut down the tree, and the owl left. 
 Counterfactual Context: It hadn't been there for many nights though.
Output (English): It would swoop over the yard looking for mice. The owl would catch mice for its babies. Eventually we had to cut down the tree, and that's why the owl left.