Task: Story Composition
Input (English): Premise: Karen was going to return her library book. 
 Initial Context: She looked all over for it. 
 Original Ending: She could not find it anywhere. She thought she had lost it! Then she found it under her bed. 
 Counterfactual Context: But her mom had already returned it.
Output (English): She looked all over for it andcould not find it anywhere. She thought she had lost it! Luckily her mom told her what happened.