Main Relative Pronouns:
* who: refers to people (subject of the clause)
* whom: refers to people (object of the clause)
* whose: refers to possession (for people or things)
* which: refers to things or animals
* that: can refer to people, things, or animals (can be used in place of who, whom, or which in many cases)
Less Common Relative Pronouns:
* what: used when referring to the whole of something, often in a defining clause (e.g., "This is what I need.")
* where: refers to places
* when: refers to time
* why: refers to reasons
Important Notes:
* That is often used as a universal relative pronoun and can be used in place of "who," "whom," or "which" in many cases.
* "Whom" is becoming increasingly uncommon in modern English, with "who" often used in its place.
* The choice of relative pronoun depends on the grammatical function of the pronoun within the relative clause.
* Relative pronouns introduce relative clauses, which provide additional information about a noun or pronoun.
Let me know if you have any other questions about relative pronouns or how to use them in sentences!