Ḥaḍara Zaydu bnu ʿAmrin: Zaydu is nominative subject with omitted tanwīn; bnu qualifies Zaydu and is mudāf; ʿAmrin is genitive mudāf ilayh.
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Full Parsing of Ibn Construction
Tanwīn: Five Types, Their Function, and Omission
Ḥaḍara Zaydu bnu ʿAmrin: Zaydu is nominative subject with omitted tanwīn; bnu qualifies Zaydu and is mudāf; ʿAmrin is genitive mudāf ilayh.