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

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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
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

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
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.

逻辑主语不是river .it 可以表示一些不用明说、大家都明白的事务：时间、距离、金钱、天气、气候等。在这儿应该是时间。

当主语较长时用it做形式主语，真的主语移后，翻译时，将真主语提前，再翻译，形式主语不译

it是形式主语 根据语意 说的是清理河流 句子的真正的主与是river 而且前面的having从句应该做主语的伴随状语 而根据意思 这个从句所修饰的只能是river

楼主的想法是对的，to clean up the river是真正的主语，但这么长的主语放在句子的前面，这种句式结构不好，所以就用it代替它做形式主语，真正的主语后置。

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 as is known to everybody ,it may now be too late to clean up the riveris known to everybody ,it may now be too late to clean up the river.A as B what C that Having suffered sruch heavy pollution already it may now be too late to clean up the river翻译汉语 ____such heavy pollution already,it may now be too late to clean up the river.A.Having suffered B.Suffering C.To suffer D.Suffered ___such heavy pollution already,it may now be too late to clean up the riveA.Having suffered D.Suffered为什么选A...D不可以吗 as is known to everybody ,it may now be too late to clean up the river.—— is known to everybody ,it may now be too late to clean up the river.A as B what C that 选A 请问不能选what引导主语从句吗?that怎么不对呢,也可以做主语 That ( )her watch .I think yours is ( )in your bag .I saw it just now.A.mayde ,maybeB.may be ,maybeC.maybe ,may beD.may de,may be ——such heavy pollution already,it may now be too late to clean up the river.A:Having sufferer B:Suffered from C:To suffer D:suffer fromA的应该是suffered ___such heavy pollution already, it may now be too late to clean up the river.A.Having suffered B.Being sufferC.To sufferD.Suffered答案是A,why谢谢了 ( )such heavy pollution today,it may now be too late to clean up the river.A Having suffered B SufferingC To suffer D Suffered希望各位可以给出详细的解答,我这个人钻牛角尖……谢谢 -----such heavy pollution already,it may now be too late to clean up the river A having suffered BC to suffer D suffered A 河道和污染是被动的关系,看了一些相关的解释不太明白. having suffered such heavy pollution already,it may now be too late to clean up the river.一般使用分词要看它和主语的关系,也就是说是主动还是被动.但这句话用having suffered 是什么原因 Chinese scientists are again becoming excited about the fact that a large hairy animal may live incentral China.Now they hope it won't be too long before they are able to prove its existence.这句话中的it won't be too Chinese scientists are again becoming excited about the fact that a large hairy animal may live in central China.Now they hope it won't be too long before they are able to prove its existence.这句话中的it won't be too 英语翻译There is too much salt in it.So we may say,we are now living in a thirsty world. Maybe you don not understande now ,but it may be useful sooner or later. My life be a lot better than it is now.为什么不用more;very;too? Be The tea is too hot.You'd better not drink it right now.