反义疑问句：There used to be a lot of trees here,____there?为什么可以用w

反义疑问句：There used to be a lot of trees here,____there?为什么可以用w there used to be a lot of trees around the village,为什么用 didn there are a lot of trees ,_____?反义疑问句 There used to be a bookstore near here.（改为反义疑问句） There used to be a lot of tall trees on that mountain,_____? There used to be a lot of trees.变为否定句 过去这儿常有很多鸟儿歌唱.There used to be a lot of birds (----) here. There used to be a lot of pandas 怎样改为反意疑问句 there used to be a lot of manatees是什么意思 There used to be a lot of pandas,_______ ______? There used to be some cities wall.的反义疑问句 There used to be.的反义疑问句是怎么样的?