Few students have finished their homework.附加疑问句

have theyfew含否定意思，在附加疑问句中不考虑是吗？那哪些情况下，单词的肯定否定意义要考虑？考虑，所以用肯定。否定词有：no ,few,little,never,hardly,scarecely ....反义疑问句用 肯定。像unhappy，unlucky之类的要考虑么？不考虑。视为肯定。