Mubtasiman is the accusative predicate of kāna but a circumstantial ḥāl after jāʾa; an identical word ending need not imply the same role.
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Integrated Analysis: Kāna and Ḥāl
Comprehensive Review: Applied Arabic Parsing
Mubtasiman is the accusative predicate of kāna but a circumstantial ḥāl after jāʾa; an identical word ending need not imply the same role.