* Pronoun: This is the most common use of "who." It acts as a subject or object pronoun, replacing a noun that refers to a person.
* Subject: *Who* are you?
* Object: I know *who* did it.
* Interrogative Adjective: When used to ask a question about a specific person, "who" acts as an adjective modifying a noun.
* *Who* is the author of this book? (Modifies "author")
* Relative Pronoun: "Who" can introduce a relative clause, providing additional information about a noun in the main clause.
* The woman *who* lives next door is a doctor. (Relates to "woman")
Let me know if you'd like examples of other parts of speech!