Task: Story Composition
Input (English): Premise: Matt liked playing the piano. 
 Initial Context: His mom signed him up for lessons. 
 Original Ending: After a few sessions his teacher became frustrated. Matt like playing music by ear instead of reading the notes. His mom said no more lessons knowing Matt could teach himself! 
 Counterfactual Context: After playing for a few years he decided he'd rather play the guitar.
Output (English): After a few sessions his teacher became frustrated. Matt liked playing music by piano instead of by guitar. His mom said no more lessons knowing Matt could already play piano!