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The past perfect (had + past participle) shows that one past action happened before another past action — it's the "past of the past."
When I arrived, the train left already.
When I arrived, the train had already left. — Use the past perfect for the action that happened first.
She had went home before I called.
She had gone home before I called. — Use the past participle (gone), not the past simple.
had finished
hadn't eaten