Task: Story Composition
Input (English): Premise: John had always wanted to have a bike. 
 Initial Context: However, he didn't know what kind of bike to buy. 
 Original Ending: A friend recommended he buy a mountain bike. John bought one and loved it. John was happy to have a new bike. 
 New ending: A friend had a nice mountain bike. He let John borrow it. John was happy to ride his friend's bike. 
Output (English): However, he didn't know what kind of bike to buy and didn't buy a bike as long as he lived.