请分析一下英语句子,主谓宾状等等,见下He described it as ‘a very agreeable situation located within two hills in the midst of which flowed a greet river.'as后是句子还是定语后置的词.如果是词,那of which 后的flowed a greet river是什么成分

直接和你讲。。。在不在。。。

as 后面状语，相当于like
of which 后面是一个定语从句用来修饰 two hills 的

主语：he
谓语：described
宾语：it
宾补： a very agreeable situation located within two hills in the midst of which flowed a greet river. 其中 as 起引导作用,与think sb as ...类似.
至于 of which 后的flowed a greet river,其所在句子“in the midst of which flowed a greet river.”就是一个倒装句,由表示位置的in短语置于句首引导.具体地所,该倒装句主语是 a greet river.懂了吧?!

这个句子是用it做形式主语，第1个that开始到句末是真实主语，为了避免头重脚轻的效果。
句子意思是：一个标志必须能够区别于其他相似的标志从而保护消费者和公众不被误导，这就是一个标志的区别所有者和其他人的基本功能。
真实主语：that he must be able to......from being misled.
形式主语：it
谓语：follows
宾语：the mark's basic function of...those of others