There used to be lots of old city walls in Beijing.反意疑问句如何用?

There used to be lots of old city walls in Beijing.反意疑问句如何用? There used to be lots of old city walls in beijing 的反意疑问句 there used to be walls around the city of beijing改为一般疑问句 There used to be反意疑问句 There used to be a lot of pandas 怎样改为反意疑问句 there used to be some trees in this field .完成反意疑问句 Many years ago ,there were many old city walls in Beijing.(同 Manly years ago ,there were many old city walls in Beijing.( Many years ago,there were many old city walls in Beijing.的同义 — There used to be lots of fish in the lake .— Yes ,but ther there used to be river in front of the city didn't there?这句话 She used to live in Beijing,___ ___?(完成反意疑问句）