your sister does not get up early,dose she?________,but she gets up late on weekends.划线部分为什么要用yes,she does来回答?像这样的题该怎么做?如果前面得问句是肯定的话,又该怎么做?麻烦高手给讲讲,谢谢!应该是dosen·t she,我打错了!