Task: Story Composition
Input (English): Premise: My mom used to go sledding by her parent's cottage. 
 Initial Context: They would bring the sled up these giant sand dunes that were frozen. 
 Original Ending: They would slide down them, but one time they had the unexpected. They went too fast and went all the way down to the water. The lake wasn't completely frozen so they got soaking wet. 
 Counterfactual Context: They used to sled all winter long but then some kids got hurt and they couldn't sled anymore.
Output (English): When they were still allowed, they would slide down them, but one time she said something unexpected happened. They went too fast and went all the way down to the water. The lake wasn't completely frozen so they got soaking wet.