رَأَيْتُ أَحْمَدَ. — I saw Aḥmad.
رَأَيْتُ: past verb with تُ as its subject pronoun.
أَحْمَدَ: direct object, accusative with fatḥa.
There is no tanwīn on Aḥmad because the name is diptote.
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Aḥmad in the Accusative
Diptote Causes — Verb Patterns and Their Conditions
رَأَيْتُ أَحْمَدَ. — I saw Aḥmad.
رَأَيْتُ: past verb with تُ as its subject pronoun.
أَحْمَدَ: direct object, accusative with fatḥa.
There is no tanwīn on Aḥmad because the name is diptote.