The pronouns used in asking questions are called interrogative pronouns. They are:

• What

• Who

• Whose

• Whom

• Which

They are also called question words.

The following tells you how each question word or interrogative pronoun is used.

What is used when asking for a thing, an event, or an idea.

Example:
What does the doctor prescribe?

Who, whom, and whose are used to refer to person/s.

• Who refers to the subject of the sentence.

Example:
Who is your doctor?

• Whom refers to the object or receiver of the action.

Example:
To whom did you give the medicine?

• Whose shows possession.

Example:
Whose medicine is this?

Which is used for both persons and things.

Examples:
Which of these fruits will you choose for the patient?
Which nurse will bring the medicines?