陈述部分主语是指示代词或不定代词everything, that, nothing, this, 疑问部分主语用it。 Everything is ready, isn't it?
陈述部分主语是不定代词everybody, anyone, somebody, nobody, no one 等,疑问部分常用复数they,有时也用单数he。
Everyone knows the answer, don't they? (does he?)
Nobody knows about it, do they? (does he?)
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