当陈述句中的主语为 anybody, anyone, everybody, everyone, somebody...

      当陈述句中的主语为 anybody, anyone, everybody, everyone, somebody, someone, nobody, no one, these, those等时,附加（反意）疑问句中的主语用 they

Everyone knows the answer, don’t they?人人都知道答案,不是吗 ?
Nobody says a word about the incident, do they?对于这场事故人们守口如瓶,是吗 ?
No one wants to go, do they?没有人想走,是吗 ?
Everybody has arrived, haven’t they?人人都到了,是吧 ?

Note:陈述句主语为 such时,附加（反意）疑问句的主语单数用 it,复数用 they例如 :

Such is his trick, isn’t it?
Such are your excuses, aren’t they?