反意疑问句中,不定代词指人用they/he?指物用it/they?

当陈述部分的主语是everyone,everybody,someone,nobody,no one,none,anyone,somebody等合成不定代词时,在非正式文体中,附加疑问句中的主语通常用he或they.例如：
Someone opened the door,didn't he/they?有人开了门,是不是?
Nobody went to the cinema,did they?没人去看电影,是吗?
当陈述部分的主语是everything,nothing,something,anything等合成词,附加疑问句中的主语用it.例如：
Nothing serious happened,did it?什么事情也没有发生,对吗?
Everything is ready,isn't it?一切准备就绪了,不是吗?