Correct Use of Interrogative Pronouns

Who

Who, whose and whom are used only of persons.

Who is this?
Who is that on the phone?
Whose is this pen?
Whom do you want to meet?

Which
Which is used for both persons and things.

Which is your car?
Which of you would like to participate?
Which is your favourite color?

What

What is used only of things.

What did you pay for this?
What did she say?
What on earth does she mean?

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