Kāna aṭ-ṭālibu yaqraʾu: the noun is nominative ism kāna. The verbal clause occupies the accusative khabar kāna slot, but yaqraʾu itself remains indicative.
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A Verbal Predicate with Kāna
Choosing the Correct Parsing: Meaning, Governance and Context
Kāna aṭ-ṭālibu yaqraʾu: the noun is nominative ism kāna. The verbal clause occupies the accusative khabar kāna slot, but yaqraʾu itself remains indicative.