ضَرَبَ زَيْدٌ عَمْرًا
Translation: Zayd struck ʿAmr.
ضَرَبَ: past verb, built on fatḥa.
زَيْدٌ: nominative subject (fāʿil), marked by ḍamma.
عَمْرًا: accusative direct object, marked by fatḥa.
The doer is the subject; the recipient of the action is the object.