وَمَا ضَرَبَ زَيْدٌ عَمْرًا.
Translation: And Zayd did not strike ʿAmr.
مَا is a particle of negation. ضَرَبَ is a perfect verb. زَيْدٌ is the striker and therefore the fāʿil. عَمْرًا receives the striking and is the direct object. Negation does not change their syntactic roles or case assignments.
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Al-Marfūʿāt: The Fāʿil, Its Definition and Full Parsing
وَمَا ضَرَبَ زَيْدٌ عَمْرًا.
Translation: And Zayd did not strike ʿAmr.
مَا is a particle of negation. ضَرَبَ is a perfect verb. زَيْدٌ is the striker and therefore the fāʿil. عَمْرًا receives the striking and is the direct object. Negation does not change their syntactic roles or case assignments.