有一读者问：下面两个句子中的反意疑问句究竟哪个正确：
(1)He ought to be punished, oughtn't he?
(2)I ought to complain, shouldn't I?
陈述句部分如用肯定形式 ought to，其后的反意疑问句（或称作附加疑问句）既可以用 oughtn't，也可以用 shouldn't。再如：
(3)We ought to go now, oughtn't we ?
(4)We ought to go now, shouldn't we ?
