In niʿma rajulan Zaydun, the verb has a concealed subject pronoun. Rajulan is an accusative tamyīz identifying that pronoun, and Zaydun is the praised person.
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Subject Pattern 3: Concealed Pronoun
Verbs of Praise and Blame: Niʿma, Ḥabbadhā, Biʾsa, Sāʾa
In niʿma rajulan Zaydun, the verb has a concealed subject pronoun. Rajulan is an accusative tamyīz identifying that pronoun, and Zaydun is the praised person.