虚拟语气的时态问题

Had the government and scientists not worked together, AIDS-related deaths _____since their highest in 2005.这题的答案是would not have fallen，而我觉得是would not fall, 从句是对过去情况的虚拟倒装if the…scientists had not…,但主句用的是since+时间点，不应该是表示是从2015年到现在吗？有since的地方大都用用现在完成时，应该是指的是现在的情况，而对现在的虚拟应该是would +v，我以为这题是个时间的错综虚拟，请问老师，我的思路错在哪里？恳请老师解惑，谢谢

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分类：词法问题

默认排序时间排序

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曹荣禄 1秒前

擅长：动词用法,句法问题

你的错误在于没有认识到现在完成时表示的事件是发生在过去的，只不过说话人关心的是现在而已。所以当你用虚拟语气时，现在完成时就要改为would have done表示与过去事实相反。从句和主句的谓语动词表示的都是过去的事件。

用陈述语气表示事实：

Because the government and scientists have worked together, AIDS-related deaths have fallen since their highest in 2005. 合作和下降都是说话时间（现在）之前的事实。

用虚拟语气表示与事实相反的假设：

If the government and scientists had not worked together, AIDS-related deaths would not have fallen since their highest in 2005.

虚拟语气的时态问题

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