would have done和虚拟语气有关 would have sth是个什么语法概念?

问题描述:

would have done和虚拟语气有关 would have sth是个什么语法概念?
would have done和虚拟语气有关
那would have sth是个什么语法概念?为什么要加would

Would have done是虚拟语气,其中WOULD是助动词
而Would have sth中的Would是意动词,有实际意义,意为“想要”
这里的Would是想要有什么意思