there be句子结构

问题描述:

there be句子结构
There is only one place we're going to get all of this.Diagon Alley.(对角巷)
后面we're.是什么从句?
关系词where呢?不可以省略的

定语从句修饰place
There is only one place (that) we're going to get all of this.Diagon Alley.