Are “who” and “whom” subject or object pronouns?
"Who" is a subject pronoun while "whom" is an object pronoun.
Who is a subject pronoun . We know it's a subject pronoun because its use is asking for the subject in the answering sentence. Ex:
Q: Who is coming to dinner?
A: Bob is coming to dinner.
Whom is an object pronoun . We know it's an object pronoun because its use is asking for the object in the answering sentence. Ex:
Q: With whom will I speaking?
A: You will be speaking to your lawyer.
"You" is the subject while "your lawyer" is the object.