What was already happening, and what happened next.
Past Simple
Structure: Subject + verb-ed
The phone rang.
A short, completed action.
Past Continuous
Structure: Subject + was/were + verb-ing
I was sleeping when the phone rang.
A longer action in progress, often interrupted.
The Interruption Pattern
Structure: While + past continuous, + past simple
While I was cooking, the fire alarm went off.
The background action (continuous) gets interrupted by a shorter one (simple).
Two Things at Once
Structure: While + past continuous, + past continuous
While she was reading, he was cooking.
Two continuous actions running in parallel, neither interrupting the other.
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