The student in wa-ṭ-ṭālibu is a coordinated nominative subject. In muʿallimu ṭ-ṭālibi, aṭ-ṭālibi is a genitive possessor in an iḍāfah.
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Case 9: Coordination versus Iḍāfah
Advanced Parsing Workshop: Integrated Grammar
The student in wa-ṭ-ṭālibu is a coordinated nominative subject. In muʿallimu ṭ-ṭālibi, aṭ-ṭālibi is a genitive possessor in an iḍāfah.