Task: Story Composition
Input (English): Premise: Alex was at summer camp. 
 Initial Context: All of his friends were swinging on a rope swing. 
 Original Ending: Alex decided to try. As he swung, he accidentally hit a rock. His arm was broken and he had to go home. 
 Counterfactual Context: All of his friends went swimming.
Output (English): Alex decided to try. As he dove in, he accidentally hit a rock. His arm was broken and he had to go home.