Interrogative Pronouns

Interrogative Pronouns
These are used to ask questions.

Example
Who has the files?

Who, Whose, Whom
These are used to refer to people.

Examples

Who took my money?
Whose MP3 player is this?
Whom did you speak with?

Which
This is used to refer to persons or things of a limited number.

Examples
Which of these outfits is yours?
Which of the boys us your borther?

What
This is used to refer to things or activities.

Examples
What is that?
What is going on?