it may now be too late to clean up the river没怎么理解

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it may now be too late to clean up the river没怎么理解
having suffered such heavy pollution already ,it may now be too late to clean up the river
我认为it may now be too late to clean up the river应该被还原为
to clean up the river may now be too late 那么主语应该是to clean up the river 这句话就错误了
我想知道怎么看出逻辑主语是river
越详细越好,谢谢

此问题术语分词的逻辑主语与分词独立结构
可以这么理解（但不推崇）,把原句变为
having suffered such heavy pollution already,river may now be too late to clean up.
一般情况下,作状语的分词的逻辑主语就是句子的主语,就如本句中,逻辑主语应该是it,但在某些情况下,如果句子的内容暗示出分词结构的逻辑主语,句子的主语同分词的逻辑主语可以并不完全一致.但这种表现法一般不宜模仿,使用,在测试中不应以此为标准.例如：]
standing near the cliff,her heart beat fast(her heart 暗示出主语she)
speaking to the king for the first time,his knees shook.(his knees 暗示出主语he)
而在本句中可以暗示出逻辑主语为river ,在这里it 只不过是形式主语,所以本句并没有语法错误,只不过是一个特列罢了.
不知给你解释清楚了吗.欢迎加我为好友,共同探讨.
以上回答参考大学英语语法第三版,作者徐广联.

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