Form and rules
How it works
Use past simple for the main events that move a narrative forward.
Use past continuous for background scenes or activities already in progress.
Use past perfect for completed events earlier than the main past reference point.
Use past perfect continuous for an earlier activity whose duration or effect matters: He was tired because he'd been driving all night.
Once the earlier time frame is clear, a narrative often returns to past simple rather than keeping every verb in past perfect.