原句中的 that was where was I would stay = that was the place where I would stay = that was the place in which I would stay = that was the place which I would stay in ；
从上面的分解看出 where 是引导了一个定语从句,但也充当 was 的表语,所以它不只是一个单纯的关系副词,而是一个连接副词；
句子意思：指着屋顶上长满灌木的房子,老人告诉我那就是他原来居住的地方.