On one stretch of desert from Ethiopia to Kenya, we were warned it was really dangerous and people had been killed.

在从埃塞俄比亚通往肯尼亚的一片沙漠上，有人警告我们说这里非常危险，之前有人在此遇害。

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Chang Xiongfa, another Shanghai-based activist, said he had been warned by the police that if he and his associates did not cooperate, "we would be dealt with."

常雄发，另外一个以上海为根据地的活动者，说，他被警察警告说，如果他和他的同事们不合作， “我们将会被处理。”

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Why do we use "had been warned" to describe an event happened in the past?

为什么我们用过去完成时，来表示过去的事情？

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We had been warned last night, after that terrible dust storm that everybody faced here in southern Iraq.

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We had been warned to expect travel chaos, security meltdown and organisational incompetence.

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