Task: Story Composition
Input (English): Premise: The class watched the giant animal move across the field. 
 Initial Context: There was a huge bison right on the other side of the fence! 
 Original Ending: They watched him walk by and head down the hill. The class learned about how Native Americans used the bison. They felt very educated on Native American history. 
 Counterfactual Context: Too bad it wasn't a bison on the other side of the fence.
Output (English): It was a moose instead, and they watched him walk by and head down the hill. The class learned about how Native Americans used the moose. They felt very educated on Native American history.