We can complete the sentences considering that the past continuous indicates the action that was taking place when another action happened (simple past).
The simple past tense is the form of the verb we use to indicate that an action took place in the past. We use the simple past tense when the action has already finished.
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The past continuous tense is used to indicate that an action had a longer duration in the past, that is, that it started in the past, lasted for a while, and then ended.
Examples:
The two tenses can be used in the same sentence to indicate that one action - simple past - interrupted another action - past continuous - or happened while the other action was taking place.
Example:
Learn more about the simple past and past continuous here:
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