Problem: Continue the following story.

Patricia knew nothing about how to use makeup so Mary taught them because 
Here's how I want to continue it: Mary wanted to help.

Problem: Continue the following story.

Robert sought medical assistance from Randy since 
Here's how I want to continue it: Randy could fix a broken joint in his arm.

Problem: Continue the following story.

The computer was fixed by Katrina instead of Jennifer since 
Here's how I want to continue it:
Jennifer has a degree in psychology.