«Inna Zaydan qāʾimun»: Zaydan is an accusative declinable ism inna.
«Lā rajula fī l-dāri»: rajula is built on fatḥ in the accusative position.
«Lā ghulāma rajulin ...»: ghulāma is an accusative declinable construct noun of lā.
These analyses differ despite partly similar visible vowels.
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Inna and Lā Are Not Identical
Ism Inna and the Noun Governed by Lā of Generic Negation
«Inna Zaydan qāʾimun»: Zaydan is an accusative declinable ism inna.
«Lā rajula fī l-dāri»: rajula is built on fatḥ in the accusative position.
«Lā ghulāma rajulin ...»: ghulāma is an accusative declinable construct noun of lā.
These analyses differ despite partly similar visible vowels.