Given more attention,the trees could have grown better.为什么句首

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Given more attention,the trees could have grown better.为什么句首不能Having given

主语是the trees,前面的Given more attention,是省略了主语the trees
如果正常说的话应该是the trees are given more attention
give应该是用被动,Having given不能表达被动
再问：这个问题缠了我好久了、、请问如果是Having been given呢？一直分不清，having（been）done和done直接放句首的差异。感激阁下的回答！
再答： Having been given more attention，the trees grow better. “could+have+done”是虚拟语气，表示对过去事情的假设，意思是本来能够做某事而没有做有些句子要求的不是那么严格的

Given more attention,the trees could have grown better.为什么句首 Given more attention,the trees could have grown better.中为什么不 __(give)more attention,the trees could have grown better. ____ more attention ,the trees could have grown better . _____ more attention ,the trees could have grown better 7 .____ more attention ,the trees could have grown better . Given more attention,the tree could have grown better中为什么用过去 Give more attention,the trees could have grown better.句中非谓语动应该是条件状语从句的Given more attention,the trees could have grown be ( )more attention ,the treescould have grown better.A.Given 1.____________more attention,the trees could have grown bett ___more attention, the tree could have grown better