Task: Story Composition
Input (English): Premise: We went four wheeling last weekend. 
 Initial Context: The truck climbed all over the rocks. 
 Original Ending: The engine roared loudly. Then the axle snapped. We had to tow it out. 
 Counterfactual Context: We did not take the truck over the rocks though.
Output (English): Because the engine had roared loudly. We had been worried the axle would snap. And then we would have had to tow it out.