求教：关于逻辑主语的问题

ysl246

是不是不管从句用什么形式，都要和主句逻辑主语一致？我以前以为只有分词结构的需要。。。

比如

GWD3-Q27:

Competition in the mid-nineteenth century by large western farms gradually caused farmers in Pennsylvania to turn to livestock raising, but before that it was predominantly grain-producing.

 

Once predominantly a grain-producing state, competition in the mid-nineteenth century from large western farms gradually was causing Pennsylvania’s farmers to turn to livestock raising. “后面competition作前面短语的逻辑主语,意思不符”

引号里的是别人的解释

前面是名词短语，后面也要逻辑主语一致么？迷惑中。。。

 

遥远的绿洲

准确的说,是同位语应该和其修饰对象一致
类似的有
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ysl246

谢谢绿洲版主~~