مَرَرْتُ بِأَحْمَدَ. — I passed by Aḥmad.
مَرَرْتُ: past verb with تُ as the subject.
بِـ: preposition.
أَحْمَدَ: genitive noun; since it is diptote, its ordinary genitive is marked by fatḥa.
This fatḥa indicates genitive case here, not accusative.
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Aḥmad in the Genitive
Diptote Causes — Verb Patterns and Their Conditions
مَرَرْتُ بِأَحْمَدَ. — I passed by Aḥmad.
مَرَرْتُ: past verb with تُ as the subject.
بِـ: preposition.
أَحْمَدَ: genitive noun; since it is diptote, its ordinary genitive is marked by fatḥa.
This fatḥa indicates genitive case here, not accusative.