Someone told me that you were ill ,but I forgot who.此句中,who 作什么成分,为什么不用whom?

Someone told me that you were ill ,but I forgot who.此句中,who 作什么成分,为什么不用whom?
Someone told me that you were ill ,but I forgot who.此句中,who 作什么成分,为什么不用whom?

Someone told me that you were ill ,but I forgot who.此句中,who 作什么成分,为什么不用whom?
做宾语……为什么不用whom……因为这种“省略形式”不能用whom……把句子子补充出来的话：forget who told me.而且口语中更常用who.
建议：遇到这种省略形式就把原句子补充出来……不容易错……

因为WHO 在前面的主句中是SOMEONE，所以是主语

因为相当于I forgot who (told me that).
有人告诉我说你病了，不过我记不起是谁（告诉我这件事了）。