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过去完成时(had + 过去分词)表示一个过去的动作发生在另一个过去动作之前——它是"过去的过去"。
When I arrived, the train left already.
When I arrived, the train had already left. — 先发生的动作用过去完成时。
She had went home before I called.
She had gone home before I called. — 用过去分词(gone),不用一般过去式。
had finished
hadn't eaten