1.She has few friends,has she?
否定意义的词
（1）当陈述部分有never,seldom,hardly,few,little,barely,scarcely,nothing,none,rarely 等否定意义的词汇时,后面的反意疑问句则为肯定形式：
There are few apples in the basket,are there?
He can hardly swim,can he?
They seldom come late,do they?
2.That is very interesting,isn't it?
当陈述部分的主语是
( 1 )用one 时,后面的疑问句可用one/he.
(2)everything,anything,nothing,something时,附加疑问句中主语用it 不用 they
（3）this,that,或those,these时,附加疑问句中主语用it和they.
（4）everyone,everybody,someone,somebody,anyone,nobody等,附加疑问句中主语一般用he（书面语）/they（口头语）.
(5)不定式,动名词,其他短语,附加疑问句中主语一般用it.
（6）在there be句型中,附加疑问句中主语一般用be/情态动词/助动词+there.