You ought to be here half an hour earlier,don’t you?
问题描述:
You ought to be here half an hour earlier,don’t you?
答
You ought to have been here half an hour earlier, oughtn't/shouldn't you?
你本该半小时前就到这了,不是吗?
半小时前本该来了,所以用have been
反义问句用oughtn't或shouldn['t都可以的.