if it had not been for the snow ,we could have climbed the mountain yesterday.这句话对吗,

题目

if it had not been for the snow ,we could have climbed the mountain yesterday.这句话对吗,
帮我分析一下知识点.

答案

对的,这是虚拟语气,对过去的虚拟
从句,用了过去完成时,it had not been for the snow,主句用could ,would,might,should加完成时,表示对过去的虚拟
整句话的意思是：
要不是昨天下雪的话,我们就能爬山了