Question

Someone told me that you were ill ,but I forgot who.此句中,who

Answer 1

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……