Quick answer: “Who’s” is a contraction of “who is” or “who has.” “Whose” shows possession — something belongs to someone. “Who’s coming to dinner?” (who is) vs. “Whose jacket is this?” (belongs to whom).
This follows the exact same pattern as its/it’s, and trips people up for the same reason — the apostrophe version isn’t the possessive one, which feels backwards at first.
| Term | Meaning / When to use | Example sentence |
|---|---|---|
| Who’s | Contraction of “who is” or “who has.” | “Who’s been eating my sandwich?” |
| Whose | Possessive — shows something belongs to someone. | “Whose car is parked outside?” |
The Expand-It Test
Replace the word with “who is” or “who has.” If it still makes sense, “who’s” is correct. “Who’s (who is) responsible for this?” works, so “who’s” is right. “Whose is this book” doesn’t expand to “who is this book,” so “whose” is correct there.
When to use Who’s
- “Who’s going to the party tonight?”
- “Who’s seen my keys?”
- “Do you know who’s calling?”
When to use Whose
- “Whose turn is it?”
- “I don’t know whose idea this was.”
- “The author, whose book just came out, is speaking tonight.”
Common Mistakes and Exceptions
Like “its,” “whose” belongs to the small group of possessive pronouns that never take an apostrophe (his, hers, its, ours, theirs, whose). If you find yourself writing “who’s” and it’s showing possession, that’s the mistake to catch — apostrophes in this family always mean a contraction, never ownership.
Frequently Asked Questions
Can “whose” refer to objects, not just people?
A: Yes — “the house whose roof is red” is grammatically correct, even though “whose” is often associated with people.
Is “who’s” ever correct as a possessive?
A: No — if you mean possession, “whose” (no apostrophe) is always the correct choice.
What’s the fastest way to remember this?
A: Pair it with its/it’s — both follow the identical rule, so once one clicks, the other does too.
