Parsing of زَيْدٌ ضَارِبٌ أَبُوهُ عَمْرًا:
1. زَيْدٌ: mubtadaʾ, nominative with visible ḍamma.
2. ضَارِبٌ: predicate (khabar), nominative with visible ḍamma; it is a governing active participle.
Meaning: “Zayd is one whose father is striking ʿAmr.” Zayd himself is not the striker; the sentence reports the striking by his father.