反意疑问句的特点是：前肯后否,前否后肯.
The cat is unhealthy,is it?因为unhealthy是否定的,所以后面要用肯定形式.
Everyone like the show,don't they?指人的复合不定代词做主语时,变反义疑问句主语常会用复数形式they.
Something is in the box,isn't it?主语是something,anything等指事或物时,附加问句主语用it