must + have + done 是对过去情况的推测,当陈述部分没有明确的表示过去的时间状语时,附加疑问要用have的相应形式；当陈述部分有明确的过去时间状语时,附加疑问要用过去时.
You must have lived here for a long time ,haven’t you
You must have seen him yesterday ,didn’t you