So then you’d ask this question: “Sheila, whom did you hit yesterday?” What if you know who did something but you don’t know who was on the receiving end of that action? Maybe you know that Sheila was in a fight yesterday, but you don’t know who is walking around today with a black eye. When to Use Whom as the Object of a Sentence You should also use whom when you are asking about the object of a prepositional phrase. The trickier question is this: How do you use whom correctly in a sentence? Use whom in questions when you want to know what person something is being done to-that is, when you want to figure out the object of the verb. Who ate my leftover spaghetti and meatballs?.Who threw the ball that broke Carol’s stained glass window?.You use who in questions when you want to know what person is doing something-that is, when you want to discover the subject of the verb. You probably already know how to use who in a sentence. Pro tip: While knowing how to use whom correctly in formal writing can definitely up your grammar cred, it’s no longer common in everyday conversation, so don’t worry about answering the phone with an elegant and correct “To whom am I speaking?”

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