Task: Story Composition
Input (English): Premise: Mark went to the grocery store to buy food for his house. 
 Initial Context: On the way to the store he is stopped by a cop. 
 Original Ending: To his surprise the officer gave him good news. They told him that he needed to go down to the station. At the station was his long lost sister he hadn't seen in 10 years. 
 Counterfactual Context: On the way to the store he got into an accident.
Output (English): To his surprise the police arrested him. They told him that he needed to go down to the station. At the station was his long lost sister he hadn't seen in 10 years.