Interrogative Pronouns: Who, Whom, Whose, Which, and What
Questions are essential for communication, enquiry, and academic discourse. In English, Interrogative Pronouns — who, whom, whose, which, and what — are used specifically to ask questions where the answer is a person, object, or selection. Mastering their syntax, case functions, and selection rules is crucial for formal writing and error-spotting exams.
Who acts as the subject interrogative pronoun; Whom acts as the object interrogative pronoun; Whose asks about possession; Which requests a choice from a specific, limited set; and What asks open-ended questions about things or categories.
✅ Subject Interrogative: Who called the office this morning?
✅ Object Interrogative: Whom did the committee select for the award?
✅ Which vs What: Which color do you prefer (red or blue)? vs What is your opinion?
1. Syntactic Breakdown of Interrogative Pronouns
| Pronoun | Grammatical Function | Refers To | Example Sentence |
|---|---|---|---|
| Who | Subject Case | Persons | "Who wrote this memorandum?" |
| Whom | Object Case (Verbs & Prepositions) | Persons | "To whom was the letter addressed?" |
| Whose | Possessive Case | Persons / Owners | "Whose jacket is hanging here?" |
| Which | Selective Choice (Bounded Set) | Persons or Things | "Which of these options do you select?" |
| What | Open Choice (Unbounded Set) | Things / Ideas / Actions | "What did the manager decide?" |
2. Who vs. Whom in Questions
To determine whether to use who or whom in a question, rephrase the sentence into a statement and substitute personal pronouns (he/she for subject, him/her for object):
- Question: (Who / Whom) did you invite to the seminar? → Statement: You invited him. → Object pronoun him requires Whom.
- Question: (Who / Whom) authored the report? → Statement: He authored the report. → Subject pronoun he requires Who.
3. Distinguishing Which vs. What
The distinction between which and what depends entirely on the size of the choice set:
- Which: Used when choosing from a restricted, known list of options (e.g., "Which of the two candidates did you hire?").
- What: Used when the possibilities are unlimited or open-ended (e.g., "What is your dream job?").
Never confuse possessive Whose with the contraction Who's (short for who is or who has). "Whose car is this?" is possessive. "Who's coming to dinner?" means who is coming.
4. Common Errors and Corrections
| ❌ Incorrect Usage | ✅ Correct Usage |
|---|---|
| Who did you give the keys to? (Formal) | To whom did you give the keys? |
| Who's bag was left on the chair? | Whose bag was left on the chair? |
| What of these two dresses looks better? | Which of these two dresses looks better? |
✍️ Quick Practice — Test Your Knowledge
Fill in the blank with the correct interrogative pronoun (Who, Whom, Whose, Which, What):
- To ________ should I submit the application form?
- ________ of the four seasons do you enjoy the most?
- ________ umbrella did you borrow during the storm?
Answers: 1. whom | 2. Which | 3. Whose
Summary & Key Takeaways
- Use Who for subjects and Whom for objects (especially after prepositions like to, with, for).
- Use Whose for possession; never confuse it with Who's (who is).
- Use Which for choices from a limited set; use What for open-ended questions.