Working lā: «لَا رَجُلَ فِي الدَّارِ»; rajula is built on fatḥ in the accusative slot.
Non-working lā, definite noun: «لَا زَيْدٌ ...»; Zaydun is nominative.
Non-working lā, intervening phrase: «لَا فِي الدَّارِ رَجُلٌ ...»; rajulun is nominative.
Check definiteness and adjacency before choosing an analysis.
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Working versus Non-Working Lā
Ism Inna and the Noun Governed by Lā of Generic Negation
Working lā: «لَا رَجُلَ فِي الدَّارِ»; rajula is built on fatḥ in the accusative slot.
Non-working lā, definite noun: «لَا زَيْدٌ ...»; Zaydun is nominative.
Non-working lā, intervening phrase: «لَا فِي الدَّارِ رَجُلٌ ...»; rajulun is nominative.
Check definiteness and adjacency before choosing an analysis.