«Lā ghulāma rajulin»: ghulāma is a muḍāf, and is accusative as a declinable noun.
«Lā rajula»: rajula is neither construct nor quasi-construct; it is built on fatḥ in the accusative position.
The visible vowel can look the same, yet “accusative declinable” and “indeclinable in the accusative position” describe different analyses.
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Why the Construct Noun Differs
Ism Inna and the Noun Governed by Lā of Generic Negation
«Lā ghulāma rajulin»: ghulāma is a muḍāf, and is accusative as a declinable noun.
«Lā rajula»: rajula is neither construct nor quasi-construct; it is built on fatḥ in the accusative position.
The visible vowel can look the same, yet “accusative declinable” and “indeclinable in the accusative position” describe different analyses.