In jāʾanī Zaydu bnu ʿAmrin, Zaydu is a nominative proper name without tanwīn; bnu is a nominative qualifying adjective and first member of an iḍāfa to ʿAmrin.
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The Core Ibn Example
Tanwīn: Five Types, Their Function, and Omission
In jāʾanī Zaydu bnu ʿAmrin, Zaydu is a nominative proper name without tanwīn; bnu is a nominative qualifying adjective and first member of an iḍāfa to ʿAmrin.