Nominative: جَاءَ أَحْمَدُ — subject with ḍamma.
Accusative: رَأَيْتُ أَحْمَدَ — object with fatḥa.
Genitive: مَرَرْتُ بِأَحْمَدَ — genitive noun with fatḥa.
Aḥmad changes syntactic case but never takes tanwīn here. Accusative and genitive look alike at the ending yet have different grammatical causes.
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Diptote Causes — Verb Patterns and Their Conditions
Nominative: جَاءَ أَحْمَدُ — subject with ḍamma.
Accusative: رَأَيْتُ أَحْمَدَ — object with fatḥa.
Genitive: مَرَرْتُ بِأَحْمَدَ — genitive noun with fatḥa.
Aḥmad changes syntactic case but never takes tanwīn here. Accusative and genitive look alike at the ending yet have different grammatical causes.