The source examples show three key checks: the noun is indefinite, it directly follows lā, and its form determines its case treatment.
If the noun is definite or another expression intervenes between it and lā, the special working pattern does not apply here.
Even with an indefinite noun, muḍāf, shabīh bi-l-muḍāf, and single non-construct nouns behave differently.
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Conditions for the Working Lā
Ism Inna and the Noun Governed by Lā of Generic Negation
The source examples show three key checks: the noun is indefinite, it directly follows lā, and its form determines its case treatment.
If the noun is definite or another expression intervenes between it and lā, the special working pattern does not apply here.
Even with an indefinite noun, muḍāf, shabīh bi-l-muḍāf, and single non-construct nouns behave differently.