She is unhappy,（）she?(反意疑问句)

is she? 它把否定的not转移到unhappy上去了

isn't

参考：
“she is unhappy,isn't she?______because he failed in the exam选择”
http://zhidao.baidu.com/question/26246459.html?fr=qrl

isn't 英语反义疑问句中有两类否定词：一类是由否定前缀或后缀构成的，这类词在改反义疑问句时视为肯定词，后面要用否定，就像这题；另一类是本身就是否定词，例如seldom, hardly 等，它们被视为否定，后面要用肯定

She is unhappy, isn't she?

对比：
She is not a freshman, is she?

is she? 因为前面的is+后面的unhappy是否定的(un代表的否定)前否后肯 所以用is she ? !!!

isn't