The Differences between Who & Whom: According to the rules | American English

The Differences between Who & Whom:

According to the rules of formal grammar, who should be used in the subject position in a sentence, while whom should be used in the object position, and also after a preposition.

Examples

Who made this decision? [here, who is the subject of the sentence]

Whom do you think we should support? [here, whom is the object of support]
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