تَقُولُ: «جَاءَنِي أَحْمَدُ، وَرَأَيْتُ أَحْمَدَ، وَمَرَرْتُ بِأَحْمَدَ».
Translation: Aḥmad came to me; I saw Aḥmad; I passed by Aḥmad.
أَحْمَدُ: nominative, with ḍamma but no tanwīn.
أَحْمَدَ: accusative, with fatḥa but no tanwīn.
بِأَحْمَدَ: genitive after a preposition, but the genitive sign is fatḥa, without tanwīn.
The visible fatḥa by itself does not prove that a noun is accusative; identify its syntactic position.
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Munṣarif and Ghayr Munṣarif — Definitions, Causes and Parsing
تَقُولُ: «جَاءَنِي أَحْمَدُ، وَرَأَيْتُ أَحْمَدَ، وَمَرَرْتُ بِأَحْمَدَ».
Translation: Aḥmad came to me; I saw Aḥmad; I passed by Aḥmad.
أَحْمَدُ: nominative, with ḍamma but no tanwīn.
أَحْمَدَ: accusative, with fatḥa but no tanwīn.
بِأَحْمَدَ: genitive after a preposition, but the genitive sign is fatḥa, without tanwīn.
The visible fatḥa by itself does not prove that a noun is accusative; identify its syntactic position.