"Whom"是英语语法中常用的关系代词，常在名词性从句中作宾语。例如："我不知道她邀请了谁参加聚会"或"你能告诉我你在等谁吗？"等。需要注意的是，"whom"只能作为宾语，不能作为主语，在名词性从句中需要根据语境确定使用"which"或"who"作为主语。
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I don't know whom she invited to the party. (我不知道她邀请了谁参加聚会。)
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Can you tell me whom you are waiting for? (你能告诉我你在等谁吗？)
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The teacher asked whom I had talked to about the project. (老师问我跟谁谈过关于这个项目的事情。)
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Whom did you see at the concert last night? (昨晚你在音乐会上见了谁？)
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She couldn't decide whom to vote for in the election. (她无法决定在选举中投票给谁。)
这些例句展示了whom在名词性从句中作宾语的用法。需要注意的是，whom只能作为宾语而不能作为主语，所以在名词性从句中要根据语境确定使用which或who作为主语。
