left是anything的定语,left的逻辑主语是anything,left与anything之间是动宾关系,所以用表示被动的过去分词left.如果是主谓关系,则用表示主动的现在分词,如Is there anybody leaving for Beijing?
还可以通过下列变式来理解
Is there anyting left to eat?=Is there anything that is left to eat?
Is there anbody leaving for Beijing?=Is there anybody who is leaving for shanghai?