Problem: Continue the following story.

Samuel ate a great deal of rice but Matthew did not because 
Here's how I want to continue it: Matthew was trying to decrease their carb consumption.

Problem: Continue the following story.

Brian had a hard time cutting the food but not Nelson because 
Here's how I want to continue it: Nelson had a sharp knife.

Problem: Continue the following story.

Kenneth liked girls more than Christopher so 
Here's how I want to continue it:
Christopher had no girlfriends to go out with.