«مَا إِنْ زَيْدٌ قَائِمٌ»
mā: negative, not governing here.
in: added particle; it is not inna with accusative governance.
Zaydun: nominative mubtadaʾ.
qāʾimun: nominative predicate.
Do not confuse this in with «إِنَّ زَيْدًا قَائِمٌ», which has a different particle and case pattern.
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Parsing: Mā In Zaydun Qāʾimun
The Predicate of Mā and Lā Resembling Laysa
«مَا إِنْ زَيْدٌ قَائِمٌ»
mā: negative, not governing here.
in: added particle; it is not inna with accusative governance.
Zaydun: nominative mubtadaʾ.
qāʾimun: nominative predicate.
Do not confuse this in with «إِنَّ زَيْدًا قَائِمٌ», which has a different particle and case pattern.