°Relative pronouns are used to combine two sentences or clauses that share a common element, such as a noun or pronoun.
°Spanish has three frequently-used relative pronouns. ¡Atención! Even though interrogative words (qué, quién, etc.) always carry an accent, relative pronouns never carry a written accent.
°"Que" is the most frequently used relative pronoun. It can refer to things or to people. Unlike its English counterpart, "that", "que" is never omitted.
°The relative pronoun "quien" refers only to people, adn is often used after a preposition or the personal "a". "Quien" has two forms: "quien" (singular) and "quienes" (plural).
°"Quien(es)" is occasionally used instead of "que" in clauses set off by commas.
°Unlike "que" and "quien(es)", "lo que" doesn't refer to a specific noun. It refers to an idea, a situation, or a past event and means "what, that which, or the thing that."