أَحْمَدُ and أَحْمَدَ show that Aḥmad has different inflected forms.
جَاءَ أَحْمَدُ: Aḥmad is the nominative subject.
رَأَيْتُ أَحْمَدَ: Aḥmad is the accusative object.
مَرَرْتُ بِأَحْمَدَ: Aḥmad is genitive but marked with fatḥa.
Unlike an indeclinable noun, a diptote responds to changes in syntactic government.
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Munṣarif and Ghayr Munṣarif — Definitions, Causes and Parsing
أَحْمَدُ and أَحْمَدَ show that Aḥmad has different inflected forms.
جَاءَ أَحْمَدُ: Aḥmad is the nominative subject.
رَأَيْتُ أَحْمَدَ: Aḥmad is the accusative object.
مَرَرْتُ بِأَحْمَدَ: Aḥmad is genitive but marked with fatḥa.
Unlike an indeclinable noun, a diptote responds to changes in syntactic government.