Niʿma al-muʿallimu Khālidun shows a subject made definite with al-, followed by a nominative makhṣūṣ.
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Subject Pattern 1: With Al-
Verbs of Praise and Blame: Niʿma, Ḥabbadhā, Biʾsa, Sāʾa
Niʿma al-muʿallimu Khālidun shows a subject made definite with al-, followed by a nominative makhṣūṣ.