请问I am not as tall as your sister,后加are I还是am I还是aren't I

问题描述:

请问I am not as tall as your sister,后加are I还是am I还是aren't I

Aren't I
此题反意疑问句的用法.
反意疑问句:
助动词加not加主语I am not as tall as your sister这句话是否定吗