Who which that whose
That can replace both in defining clauses.
| Pronoun | Refers to | Example |
|---|---|---|
| who | people | the woman who sings |
| which | things | the car which broke |
| that | people or things | the film that I saw |
| whose | possession | the man whose car was stolen |
No commas — the clause is essential to the meaning.
Use commas — the clause can be removed without changing meaning.