Task: Story Composition
Input (English): Premise: Charles had always wanted to learn to play tennis. 
 Initial Context: He and a friend decided to buy rackets and play a game. 
 Original Ending: At first, Charles found it difficult. However, he gradually improved. Charles was happy to be learning to play tennis. 
 New ending: Even at first, Charles found it very easy. He gradually got even better. Charles was happy to be learning to play tennis. 
Output (English): He improved very quickly.