Task: Story Composition
Input (English): Premise: Marcus decides that he wants to play a sport this Spring. 
 Initial Context: He has always been a great runner. 
 Original Ending: He decides to try out for the track team. Marcus practices very hard until tryouts begin. Marcus succeeds in tryouts and makes the team! 
 New ending: He decides to try out for the swim team. Marcus practices very hard until tryouts begin Marcus succeeds in tryouts and makes the team 
Output (English): He has always been a great swimmer.