这是混合虚拟语气
if 引导的从句中是对现实进行的虚拟
而主句是对过去的虚拟.即说话人到现场看的时候.
它的意思应该是,如果你现在想了解,那么你（过去的那个时候）应该到那里去看看.
而how 引导的句子是对现实情况的真实阐述.故用is.
一个关于英语条件句的问题You should have been there if you wanted to see
2个回答
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