ضَرَبَ زَيْدٌ عَمْرًا — Zayd struck ʿAmr: regular subject-first order.
ضَرَبَ عَمْرًا زَيْدٌ — It was ʿAmr whom Zayd struck: object-first order.
Zayd remains the subject and ʿAmr the object. Rearranging the words does not change their visible cases. Object fronting can provide discourse emphasis, but this is an explanatory observation rather than a new case rule.
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Subject Rules: Order, Ellipsis and Passive Promotion
ضَرَبَ زَيْدٌ عَمْرًا — Zayd struck ʿAmr: regular subject-first order.
ضَرَبَ عَمْرًا زَيْدٌ — It was ʿAmr whom Zayd struck: object-first order.
Zayd remains the subject and ʿAmr the object. Rearranging the words does not change their visible cases. Object fronting can provide discourse emphasis, but this is an explanatory observation rather than a new case rule.