حَضَرَ الطَّالِبَانِ.
Translation: The two students arrived.
حَضَرَ: past-tense verb, built on fatḥa.
الطَّالِبَانِ: subject (fāʿil), nominative with alif because it is dual.
Main point: Alif is the nominative sign here, instead of the usual ḍamma on a singular noun.