Problem: Continue the following story.

The ambulance that Matthew called for Joel finally arrived because he was in so much pain from kidney stones.
Here's how I want to continue it: Matthew accompanied him in the ambulance to the hospital.

Problem: Continue the following story.

Betty had to go outside to retrieve water but not Monica because
Here's how I want to continue it: Betty had to go to the well.

Problem: Continue the following story.

Christine stayed dry in the rain while Amy got wet, because
Here's how I want to continue it:
Amy had forgotten their umbrella.