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?)
资料来源:
http://cb.yyzb.cn/GrammerOnline/right.jsp?id=256当陈述部分的主语是everything, anything, something, nothing等表示物的不定代词时,反意疑问句部分的主语用it。
Everything has gone wrong today, hasn”t it?
资料来源:
http://www2.chinaedu.com/101resource004/wenjianku/200752/101ktb/lanmu1/f20e0374/f20e0374.htm