Given more attention,the tree could have grown better中为什么用过去式啊
问题描述：
Given more attention,the tree could have grown better中为什么用过去式啊
答
这是过去分词作状语相当于 一个 虚拟条件句 句子是与过去相反的虚拟语气 原句= if the tree had been given more attention,it could have grown better.假如给予更多的关照,这棵树就可能会长得更好