Companion sense: مَرَرْتُ بِنَدْمَانٍ — genitive after bi-, kasra and tanwīn.
Regretful sense: مَرَرْتُ بِنَدْمَانَ — genitive after bi-, fatḥa and no tanwīn.
These are teaching examples; each must be understood with its specifically stated meaning.
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Nadmān in the Genitive: Two Readings
Diptote Causes — Additional Alif and Nūn and Their Conditions
Companion sense: مَرَرْتُ بِنَدْمَانٍ — genitive after bi-, kasra and tanwīn.
Regretful sense: مَرَرْتُ بِنَدْمَانَ — genitive after bi-, fatḥa and no tanwīn.
These are teaching examples; each must be understood with its specifically stated meaning.