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

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

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

given 是说给过了,只强调过去某一时给过。而having given 则强调不仅给过而且已经给完!