英语句子成分分析

Question

It had come to be accepted that the pigs,who were manifestly cleverer than the other animals,should decide all questions of farm policy,though their decisions had to be ratified by a majority vote.

After surveying the ground,Snowball declared that this was just the place for a windmill,which could be made to operate a dynamo and supply the farm with electrical power.
分析句子成分（主语谓语状语定语什么的……基本每个词都要分析，若有二重复句，从句也请分析）

Answer 1

It （形式主语）had come to be accepted that（that 后面整个句子做句子的主语） the pigs,who were manifestly cleverer than the other animals（做pig的定语从句）,should decide all questions of farm policy,though their decisions had to be ratified by a majority vote（让步状语从句）

After surveying the ground（时间状语）， Snowball（主语） declared（谓语） that (宾语从句）this was just the place for a windmill,which（指前面整个句子） could be made to operate a dynamo and supply the farm with electrical power.追问

which（指前面整个句子）那么从which开始到底是什么语

追答

which 后面是个非限定性定语从句

Answer 2

学好从句之前学好句子的成分很重要。