Al-muʿallimūna is nominative with wāw as a sound masculine plural. Yashraḥūna is indicative by retaining nūn; its wāw is the plural subject pronoun. Do not confuse nominal case markers with verb mood markers.
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Case 2: Wāw and Retained Nūn
Advanced Parsing Workshop: Integrated Grammar
Al-muʿallimūna is nominative with wāw as a sound masculine plural. Yashraḥūna is indicative by retaining nūn; its wāw is the plural subject pronoun. Do not confuse nominal case markers with verb mood markers.