Task: Story Composition
Input (English): Premise: Tom loved his pet turtle. 
 Initial Context: He would come home every day and feed him. 
 Original Ending: One day Tom didn't see his turtle. He searched everywhere for him. Tom never saw his turtle again. 
 Counterfactual Context: But one day, his turtle died and Tom was devastated.
Output (English): One day Tom forgot and didn't see his turtle. He searched everywhere for him. Tom never saw his turtle again.