当前面句子中的主语是everybody, nobody, somebody, everyone, no one ,someone, nothing, something时,反义疑问句中的代词用they。当前面句子中的主语为anything, everything, nothing, something 时,反义疑问句中的代词用it。
No one was hurt in the accident, were they?
没有人在这次事故中受伤,是不是?
Everything seems all right, doesn't it?
一切似乎都正常,是吗?
it,一般不确定都用it