同志们，我们来复习一下-ing做修饰语的问题吧TAT

许楚iris

同志们呐，不知道大家有没有印象，貌似LZ是在prep笔记中看到的，如果前面主句时态是个完成成，后面的“逗号加上-ing结构”是不能做伴随修饰的，因为前面已经完成了就不需要伴随了，所以这个-ing结构是做定语修饰前面的名词。于是，问题出现了……
例子1：Neuroscientists have amassed a wealth of knowledge over the past 20 years about the brain and its development from birth to adulthood, now drawing solid conclusion…这句话想必大家都很熟吧，当时错误的原因是这样说的，因为前面是完成时，时态不搭，所以drawing不能做伴随，而是做定语修饰前面的名词，因此逻辑错误。（符合上面的原则）
例子2：Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced some 100000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago. 这句话中，因为后面是having gone virtually unregulated，虽然前面是完成时，但也能伴随。然而，逻辑上它应该是修饰前面的名词，所以这句话错了。（LZ也可以理解）
例子3：Past assessments of the Brazilian rain forest have used satellite images to tally deforested areas, where farmers and ranchers have clear-cut and burned all the trees, but such work has not addressed either logging, removing only selected trees, or surface fires, burning down individual trees but do not denude the forest.这句话中，prep解释中并没有说removing和burning有去做伴随的嫌疑，而是通过其他错误排除掉得。我想是以为内前面是has not addressed，所以-ing不能伴随，只能做定语修饰前面的名词，逻辑上是没有错误的。（符合上面的原则）
例子4：In an attempt to produce oysters, a firm in Scotland has developed a prototype of a submersible oyster farm, sitting below the surface of the ocean, and it provides ideal conditions for the mollusks' growth.这句话，除了it provides的错误以外，笔记中还解释说，sitting有修饰歧义，因为它去做了伴随。But！！！！！！这句话的前面也是完成时，为什么sitting就去做了伴随了呢？它应该是修饰前面的名词没有问题的啊……
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大家帮忙看一看，如果以上原则不对，那么前面三道题的解释就都推翻了；如果以上原则正确，那么最后的一个句子又该怎么解释呢？

许楚iris

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许楚iris

帮我看看呀，同志们