虚拟语气吗The tunnel would be well-ventilated if tall chimneys we

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/06/10 17:32:26

虚拟语气吗The tunnel would be well-ventilated if tall chimneys were built above sea-level.
这句话是与现在事实相反的虚拟语气吗?
现在时候相反的虚拟语气：主句用would do 从句用一般过去式或者were
这句话很明显都符合这两个条件
但是这句话在这篇课文中,描述的是过去的事情,为什么不用与过去事实相反的虚拟语气呢?当然了,这句话也可以理解为一个不管现在过去将来都是一个事实,所以用与现在事实相反的虚拟语气!
如果把这句话改为不是虚拟语气,仅仅是过去的一个事情的话,要怎么改呢?
for if the train entered this tunnel,it would solve the problem of ventilation.
这句话也是虚拟语气吗？

首先第一个问题,这句话是与现在事实相反的虚拟语气.
其次,你说的“在这篇课文中,描述的是过去的事情”,课文的时态是过去时没错,但仔细分析这个句子,应该理解为“在当时那个条件下,海底隧道应该还没有建成时,提出的一种设想”.相比于“当时”,确实可认为是将来时.
再次,改为陈述句：Tall chimneys were bulit above sea-level,so the tunnel was well-ventilated.
最后,此为if引导的条件句,不算虚拟语气用法.”从句一般过去式,主句过去将来式“

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