Relative pronouns introduce relative clauses that clarify or specify the antecedent. For example, in "Trees, which are plants, need sunlight to grow," the word "which" is a relative pronoun.
Relative pronouns tie in relative clauses that clarify or specify the subject.
He who laughs last is the slowest to get the joke.
In the preceding sentence, "who" is a relative pronoun that introduces the relative clause "who laughs last"—which helps narrow down and define the antecedent noun phrase "He".
The main relative pronouns are:
- Which / Whichever
- Who / Whom / Whoever / Whomever