为什么说If I had know that you were coming,I would have picked you up at the airport.是与过去相反?

为什么说If I had know that you were coming,I would have picked you up at the airport.是与过去相反?

题目
为什么说If I had know that you were coming,I would have picked you up at the airport.是与过去相反?
为什么说 If I had know that you were coming,I would have picked you up at the airport.是与过去相反?可以改成 If I knew that you were coming,I would pick you up at the airport.那就是于现在相反啦
答案
是对过去的虚拟.不可以吧.后一句不是变成对现在的虚拟了吗?
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