Why is the Relative Pronoun Missing?

Should I use a relative pronoun or not? See if you can translate the English sentence into Arabic before you listen to the explanations and translation. After studying here, check out the RELATIVE SENTENCE quiz podcast! Examples: · I met a professor who teaches at the university · قابلت أستاذًا يدرّس في الجامعة · The professor I met is from Iraq · الأستاذ الذي قابلته من العراق --- Examples: · I bought books · اشتريت كتبا · The books that I bought are interesting · الكتب التي اشتريتها ممتعة --- قابلته اشتريتها --- This episode is sponsored by · Anchor: The easiest way to make a podcast. <a href="https://anchor.fm/app">https://anchor.fm/app</a> --- Send in a voice message: https://anchor.fm/thouria-benferhat/message