The interrogative pronouns who, whom, and whose are used only for reference to people. The interrogative pronouns which and what are used for reference to things.
Interrogative pronouns - Easy Learning Grammar
- Who is dancing with Lucy?
- Which of these books would you recommend?
- What do you do when you’re on holiday?
- Whose are these clothes?
- Who is that man over there?
- Who did this?
- Who controls the day-to-day running of the business?
- What happened next?
- What did you have for lunch?
- Which do you prefer, working in theatre or film?
- Which is your favourite Simpsons episode?
- Whose is that sports car outside?
- Whose side are you on?
- Whom is the object form of who. It is a very formal word and one which most speakers avoid using in casual conversation, when who could be used instead. When writing, however, it is usual to use whom.
- Who do you have in mind?
- Who were you speaking to?
- Whom have you in mind?
- To whom were you speaking?
- The object forms of the interrogative pronoun are used after a preposition. In informal and everyday usage, you can place the preposition at the end of the clause.
- Who does this belong to? Informal
- To whom does this belong? Formal