陈述部分的主语是 everybody, everyone, anybody, anyone, somebody, someone, nobody, no one, none, neither 时, 其反意疑问句的主语需用复数代词they.例如：
Everyone is here, aren't they? 大家都到了,是吗?
No one knows about it, do they? 没有人知道这件事,对吗?
选B