Problem: Continue the following story.

Emily had wicked allergies every spring when the trees started blooming but Samantha was unaffected. 
Here's how I want to continue it: Emily had runny nasal passages the whole season.

Problem: Continue the following story.

Benjamin knew how to mend a broken tap but Justin did not as 
Here's how I want to continue it: Benjamin had excellent mechanical skills.

Problem: Continue the following story.

Derrick had excellent credit but Christopher did not because 
Here's how I want to continue it:
Derrick didn't spend beyond their means.