musthave的反问疑问Youmusthaveleftyourbaginthetheatre,haven'tyou?你一定是把包落在剧场了,是不是?AuntLiumusthavegottotheU.S.A.yesterday,didn'tshe?刘大婶昨天准是到了美国了,对不?两句话,前面同样是

　　musthave的反问疑问

　　Youmusthaveleftyourbaginthetheatre,haven'tyou?你一定是把包落在剧场了,是不是?AuntLiumusthavegottotheU.S.A.yesterday,didn'tshe?刘大婶昨天准是到了美国了,对不?两句话,前面同样是musthave为什么一个是haven'tyou

　　didn'tshe

　　怎么分辨