there used to be river in front of the city didn't there?这句话怎么翻译,didn't there怎么理解?

问题描述:

there used to be river in front of the city didn't there?这句话怎么翻译,didn't there怎么理解?

这是一个反义疑问句?
这曾经有一条河在城市前面,不是吗?