ضَرَبَ زَيْدٌ عَمْرًا: ʿAmr is the direct object.
ضَرَبَ زَيْدٌ ضَرْبًا: ḍarban is the absolute object.
ضَرَبَ زَيْدٌ عَمْرًا ضَرْبًا: both grammatical roles coexist.
An accusative nominal is not identified by ending alone; identify its function.
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Direct Object vs Absolute Object
Al-Mafʿūl Bih: Definition, Fronting and Omission
ضَرَبَ زَيْدٌ عَمْرًا: ʿAmr is the direct object.
ضَرَبَ زَيْدٌ ضَرْبًا: ḍarban is the absolute object.
ضَرَبَ زَيْدٌ عَمْرًا ضَرْبًا: both grammatical roles coexist.
An accusative nominal is not identified by ending alone; identify its function.