فَإِنْ كَانَ بَعْدَ «لَا» نَكِرَةٌ مُفْرَدَةٌ، تُبْنَى عَلَى الْفَتْحِ، نَحْوُ: «لَا رَجُلَ فِي الدَّارِ».
Translation: If a single indefinite noun follows lā, it is built on fatḥ, as in “There is no man in the house.”
When the noun immediately following lā is an indefinite non-construct, non-quasi-construct expression, the book calls it mufrad in this syntactic sense.
In «لَا رَجُلَ فِي الدَّارِ», rajula is built on fatḥ and occupies the accusative slot as the noun of lā.
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Ism Inna and the Noun Governed by Lā of Generic Negation
فَإِنْ كَانَ بَعْدَ «لَا» نَكِرَةٌ مُفْرَدَةٌ، تُبْنَى عَلَى الْفَتْحِ، نَحْوُ: «لَا رَجُلَ فِي الدَّارِ».
Translation: If a single indefinite noun follows lā, it is built on fatḥ, as in “There is no man in the house.”
When the noun immediately following lā is an indefinite non-construct, non-quasi-construct expression, the book calls it mufrad in this syntactic sense.
In «لَا رَجُلَ فِي الدَّارِ», rajula is built on fatḥ and occupies the accusative slot as the noun of lā.