there must be many people dancing 变反意疑问句

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there must be many people dancing 变反意疑问句

变反意疑问句
there must be many people dancing.isn't it?

Is there any people dancing??

There must be many people dancing,mustn't there?当陈述部分是there存在句时,附加疑问部分的主语也用there.而陈述部分带有情态动词must时,附加疑问部分通常用must.这样解释明白吗?