أَقَائِمٌ زَيْدٌ؟ — مَا قَائِمٌ زَيْدٌ.
The first uses an interrogative hamza; the second uses negation. In both, Zaydun is the nominative agent governed by qāʾim.
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Question versus Negation
Ism al-Fāʿil: Formation, Governance, Conditions and Time
أَقَائِمٌ زَيْدٌ؟ — مَا قَائِمٌ زَيْدٌ.
The first uses an interrogative hamza; the second uses negation. In both, Zaydun is the nominative agent governed by qāʾim.