Task: Story Composition
Input (English): Premise: Tom was building  an igloo. 
 Initial Context: It was a large igloo. 
 Original Ending: His dad told him igloos had to be made from snow. Tom's igloo was made from dirt. Tom happily decided it would now be called a mud hut. 
 Counterfactual Context: It was made of ice.
Output (English): His dad told him igloos had to be made from snow. Tom's igloo was made from ice. Tom happily decided it would now be called an ice hut.