Inna governs aṭ-ṭāliba; the verbal clause yaktubu d-darsa is its nominative predicate slot, with an implied subject.
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Integrated Analysis: Inna with a Verbal Predicate
Comprehensive Review: Applied Arabic Parsing
Inna governs aṭ-ṭāliba; the verbal clause yaktubu d-darsa is its nominative predicate slot, with an implied subject.