一道反意疑问句.There used to be a lot of trees around the place,_di

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一道反意疑问句
.There used to be a lot of trees around the place,_didn't there?
请问：为什么用didn't there 而不用aren't there呢?
规则一、陈述部分为There (Here) + be + 主语时,问句部分用动词+there(here)?形式
规则二、陈述部分用used to +主语时,问句部分用didn’t + 主语?或usedn’t +主语?

There used to be a lot of trees around the place,_didn't there?
注意这儿的BE是跟used to跑的,真正的谓语是used,在反意疑问句中,当然得用didn't

there used to be a lot of trees around the village,为什么用 didn There used to be a lot of pandas 怎样改为反意疑问句反义疑问句：There used to be a lot of trees here,____there?为什么可以用w There used to be反意疑问句 there used to be some trees in this field .完成反意疑问句 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 there used to be walls around the city of beijing改为一般疑问句 there are a lot of trees around the house.there are trees ar There used to be a village,后面的反意疑问句是wasn't there还是didn't the There used to be lots of old city walls in beijing 的反意疑问句 There used to be lots of old city walls in Beijing.反意疑问句如何用?