Parsing of مَا ضَرَبَ زَيْدٌ عَمْرًا:
1. مَا: particle of negation; it has no syntactic case position.
2. ضَرَبَ: perfect verb, built on fatḥ.
3. زَيْدٌ: fāʿil, nominative with visible ḍamma.
4. عَمْرًا: direct object, accusative with visible fatḥa.
The verbal sentence is negated, but the basic verb–subject–object parsing remains unchanged.