主动 have been doing 被动 have been being done
Some stamps have been being collected by them since 2000.您好 我问的是现在完成进行时的被动语态结构 而您告诉我的是现在完成是的被动语态这就是现在完成进行时现在完成时是 Some stamps have been collected by them since 2000。你的句子主动是现在完成进行时，被动是现在完成时