«مَا زَيْدٌ قَائِمًا» = Zayd is not standing.
mā: negative particle operating here like laysa.
Zaydun: ism mā, nominative with a visible ḍammah.
qāʾiman: khabar mā, accusative with fatḥah and tanwīn.
There is no lexical verb that makes Zayd a fāʿil; Zayd is the noun governed by this negative particle.
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Full Parsing: Mā Zaydun Qāʾiman
The Predicate of Mā and Lā Resembling Laysa
«مَا زَيْدٌ قَائِمًا» = Zayd is not standing.
mā: negative particle operating here like laysa.
Zaydun: ism mā, nominative with a visible ḍammah.
qāʾiman: khabar mā, accusative with fatḥah and tanwīn.
There is no lexical verb that makes Zayd a fāʿil; Zayd is the noun governed by this negative particle.