Hey there! This is a great question about proper grammar usage. The correct phrase to use depends on the context and function of the phrase in a sentence.
If you are using the pronoun as the subject of the sentence or clause, you would use "who." For example, "Who is going to the party?" In this sentence, "who" is the subject of the sentence, and it stands in for the person or people going to the party.
On the other hand, if you are using the pronoun as the object of a preposition or a verb, you would use "whom." For example, "To whom should I address this letter?" In this sentence, "whom" is the object of the preposition "to," and it stands in for the person or people to whom you should address the letter.
It's important to note, however, that "whom" is generally considered more formal and often sounds overly formal in everyday conversation. In casual conversation, it's common to use "who" instead of "whom" in both subject and object positions.
So, in conclusion, the correct phrase to use in your question would be "for whom" as you are using it as the object of a preposition. I hope this helps! Let me know if you have any further questions.
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