«lā quwwata» can represent a noun built on fatḥ in the accusative syntactic position.
«lā quwwatan» with tanwīn presents an accusative declinable noun in a different analysis.
A final fatḥah alone does not settle the grammatical classification: distinguish mabnī from muʿrab manṣūb.
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Visible Fatḥ versus Accusative
Ism Inna and the Noun Governed by Lā of Generic Negation
«lā quwwata» can represent a noun built on fatḥ in the accusative syntactic position.
«lā quwwatan» with tanwīn presents an accusative declinable noun in a different analysis.
A final fatḥah alone does not settle the grammatical classification: distinguish mabnī from muʿrab manṣūb.