You haven't passed the exam,haven't you?

有这种“否定+否定”，或者“肯定+肯定”的附加疑问句？

1）Bob rarely got drunk, did he?
Few people know him, do they?
She seldom goes to the cinema, does she?
上述诸句算“肯定+肯定”的附加疑问句？即便语义上不是，那形式上也许算是吧！

2）在口语和非正式文体中，为了加强语气，只是表示某种惊奇、怀疑、反感、讽刺等感情而并不是为了寻求回答，这时前后两部分的肯定、否定是一致的。如：
　　Oh, he is a writer, is he?
　　You’ll not go, won’t you?

英语附加疑问句在英语所有疑问句中是结构最复杂、语义和语用功能最丰富的疑问句形式。
abstract:english tag questions have the most complicated structures and the most semantic and pragmatic functions among all kinds of english questions.this paper briefly explains the meaning of humanism and analyzes the implications,features and pragmatic functions of english tag questions;meanwhile it explores the relationship between the humanism and the use of english tag questions.inthe end,it summarizes the development ofthe pragmatic functions of english tag questions is the result of the development of the social culture.
也许这是一个没有明确答案的问题，因为主流语法对楼主所提的特殊附加疑问句现象是持排斥立场的。但存在就有其合理性。就我的孤陋寡闻，在口语中，“否定+否定”，或者“肯定+肯定”的附加疑问句是存在的，尤其在非正式英语表达中，更是何其之多。（本文所用的英语均来自网上，部分属限制级）