楼主!
must have done 表示肯定推测的现在完成时态（已经完成了过去的动作）
must 表示肯定推测 have done 表示已经做了什么事 是现在完成时态
加 not 表示对现在完成时态的否定 句中表示肯定没有足够的钱 不是对must的否定（对must的否定表示 肯定没有做）
He must have not had enough money to get something .这个句子中mus
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