Question

帮忙分析一下这个句子的结构：

原句：To these indirect presumptions that our sensations, following the mutations of our capacity for feeling, are always undergoing an essential change, must be added another presumption, based on what must happen in the brain.

Answer 1

可以从这个句子中分离出如下几句话：
1、句子主干结构：To these indirect presumptions must be added another presumption, 这其实是一个倒装句；B must be added A，其正常语序应该是A must be added to B.此处的A=another presumption, B=these indirect presumptions 当然A和B后边分别跟有定语结构，这样就难上加上，把句子搞得很复杂，蛮吓人的，呵呵；
2、based on what must happen in the brain.正是修饰A的v-ed短语，即非谓语动词的一种，作A的后置定语，而这个动词短语中又包括what引导的宾语从句。
3、that our sensations ，following the mutations of our capacity for feeling，are always undergoing an essential change.这是修饰B的后置定语，而在这个定语从句中又插入了现在分词短语following the mutations of our capacity for feeling作伴随状语。
好，以上句子分析清楚了。

Answer 2

总分总