Can you give someone a sentence with the word whom?

Answer 1

To whom it may concern

Who is a subject pronoun; it is used as the subject of a verb. Whom is an object pronoun. If you find you can replace who/whom with he, she, or they, who is correct. If you find you've replaced who/whom with him, her, or them, then whom is correct.

Answer 2

yes, the word "whom" can be used in a sentence like: Whom does it belong to?It is formal English.