It is such an interesting book as we all like very much,为什么是定语从句?

It is such an interesting book as we all like very much定语从句：定语从句就是用来修饰名词或代词的句子,起到定语的作用,所以叫做定语从句.被修饰的词叫先行词.定语从句不同于单词作定语的情况,它需要放在被修饰...强调句要强调先行词的话可以这么改：it is such an interesting book that we all like very much结果状语主从复合句:it is such an interesting book that we all like very much.为什么这两个句子一样？