. 当陈述部分有never,seldom, hardly,few,little,barely, scarcely, nothing 等否定词时,后面的疑问句则表示为:
There are few apples in the basket, are there?
He can hardly swim, can he?
They seldom come late, do they?
这里写的很详细
http://zhidao.baidu.com/question/74241773.html?si=1