条件从句中各种虚拟语气（与现在事实相反的虚拟语气,与过去事实相反的虚拟语气,表将来发生情况或实现的可

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if it rains tomorrow,i will not go there,对于未来的假设
if i were you ,i won't do this对于现在的假设
i should have done it better对于过去的假设