Question

此句请帮忙找出主谓宾结构。是什么类型的句子？ 谢谢！

Indeed,what might Mercator have thought were it suggested to him that his scheme would one day be used to plot landscapes so far from terrestrial in aspect as to reflect back,in their magnificent alienness,the very idea of an old and exhausted earth?

Answer 1

全句为主从复合句。
下面，顺文章依次分析句子：
Indeed, what might Mercator have thought （由what引出主语从句）were （系词）it （表语）suggested （过去分词，做it的后置定语）to him that （由于suggest后面需要双宾语，这里的that引出直接宾语从句，前面的to him为介词短语）his scheme （从句中的主语）would one day be used to plot landscapes so far from terrestrial in aspect as （这里的so 应当同后面的as联系起来看，意思为“以致”，far from与后面的to联系起来看，far from ... to +动词不定式）to reflect back, in their magnificent alienness, the very idea of an old and exhausted earth?（从in their magnificent alienness, ... 开始可以理解为一句省略的问句。）
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Answer 2

主语： Mercator
谓语：were
宾语：it suggested to him that his scheme would one day be used to plot landscapes so far from terrestrial in aspect as to reflect back,in their magnificent alienness,the very idea of an old and exhausted earth