Interrogative Pronoun

An interrogative pronoun asks a question. They are exactly the same words as a relative pronoun but relative pronouns do not ask a question.

Who is the teacher? What is for supper?

Note: the following sentence has a relative pronoun, not an interrogative pronoun.

I love books which speak well of liberty.

Greek:

The interrogative pronoun is spelled exactly as the indefinite pronoun except the interrogative pronoun always has an accent on the first syllable; see BBG 10.11 or here.

Hebrew:

See here (§8i) or this video.