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We use the Past Perfect Simple to describe an action or event that occurred before another action or event in the past.
This tense indicates that one action or event was completed before another action or event took place.
Form: had + V3
For example: "She had finished her homework before she went to bed."
This sentence indicates that the action of finishing homework (past perfect) occurred before the action of going to bed (simple past).
Signal words: "before", "after", "already", "by the time" etc.
The Past Perfect Simple is used to describe an action completed before another action or event in the past, while the Past Perfect Continuous is used to describe an ongoing or continuous action that occurred before another action or event in the past.