Who / whom

“Who” is a pronoun used as the subject of a sentence; “whom” is a pronoun used as the object of a sentence. When in doubt, remember that “whom” and the pronoun “him” both end in “m.” Ask yourself if the hypothetical answer to the question would contain “he” (“she”) or “him” (“her”). If it’s “him,” use “whom” (both ending in “m”). Correct: Who was that masked man? (“He was that masked man.”) Incorrect: Whom was that masked man? (“Him was that masked man.”) Correct: Brother William is the monk to whom I am most indebted (“I am most indebted to him,” not “I am most loyal to he”). See also “Who Versus Whom” by Mignon Fogarty