Then there is the objective case which involves the person place or thing that the subject is interacting with. When to use who Who like I he she we and they is used as the subject of a sentence. Pin On Nishu Subjective pronoun With whowhom did you argue. . Who - whose - whom - that and which - are relative pronouns. In recent years who often replaces whom. We use Whose because the pronoun is indicating that the book belongs to someone. For instance the answer to the question above is Aretha Franklin. Where is a relative adverb. If he sounds right you should use who. Use this they or them method to decide whether who or whom is correct. In the sentence is is the verb and the subject of the verb is who. As in the other instances whose could be replaced by another pronoun in the possessive case such as his her our my your etc. Objective pronoun You thanked whowhom. Which can serve as the sub...