What and which, used to ask questions about things
Who and whom, used to ask about people
Whose, used to ask about ownership
Examples: Interrogative pronounsWhose is this jacket?
What were your favorite classes at school?
Whom do you admire the most?
NoteAll English interrogative pronouns can also function as relative pronouns.
Relative pronouns A relative pronoun is used to introduce a relative clause—a phrase that usually supplies more information about the preceding noun. They have a lot in common with interrogative pronouns. The relative pronouns are:
Which(ever), that, and what(ever), used in relation to things
Who(ever) and whom(ever), used in relation to people
Whose, used to indicate ownership
Relative pronouns are often omitted in practice (e.g., “the book [that] I read”). There’s nothing wrong with doing this as long as it doesn’t create ambiguity.
Examples: Relative pronounsThe first thing that I thought of was a cloud.
It doesn’t matter whose it was; it’s ours now!
Whoever broke the chair should own up to it.
Indefinite pronouns Indefinite pronouns are words like “somebody” that refer to an unspecified person or thing. Many of them are formed using some combination of some-, any-, every-, or no- with -thing, -one, -where, or -body.
There are also various indefinite pronouns used to describe quantity, such as “little,” “many,” “none,” and “enough.” And there are distributive pronouns like “neither” and “each” that allow you to distinguish between options.
The impersonal pronoun “one” can also be regarded as indefinite.
Examples: Indefinite pronounsTry to think of somewhere nice to go for dinner.