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过去完成时与一般过去时的比较

一般过去时表示过去时间的动作或状态。过去完成时表示的动作或状态发生在一般过去时表示的动作或状态之前，因此它表示的是“比过去更过去”。

I returned the book that I had borrowed.

我已归还了我借的书。

He didn't know a thing about the verb, for he had not studied his lessons.

他对动词一无所知，因为他没有好好学习功课。

I had been at the bus stop for 20 minutes when a bus finally came.

我在车站等了20分钟车才来。