摘要：2．表示与过去事实相反的条件 条件从句用动词的过去完成时.主句用should或would+have done.也可用could, might代替should, would. If I had known your telephone number yesterday, I would have telephoned you. 如果昨天我知道你的电话号码.我就给你打电话了. If it had not rained this morning, I should have gone shopping. 今天早上要是没下雨.我就去买东西了. The flood might have caused great damages to the people if we had not built so many reservoirs. 倘若我们没有修建这么多的水库.洪水就会使人民遭受巨大的损失.

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