مَا زَيْدٌ قَائِمًا
Translation: Zayd is not standing.
مَا: negative particle working like laysa; indeclinable.
زَيْدٌ: nominative ism mā, visible ḍamma.
قَائِمًا: accusative khabar mā, visible fatḥa.
The underlying nominal sentence was زَيْدٌ قَائِمٌ. This working mā leaves the ism nominative and changes the predicate to accusative.
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Ism of Mā and Lā Resembling Laysa; Khabar of Lā of Generic Negation
مَا زَيْدٌ قَائِمًا
Translation: Zayd is not standing.
مَا: negative particle working like laysa; indeclinable.
زَيْدٌ: nominative ism mā, visible ḍamma.
قَائِمًا: accusative khabar mā, visible fatḥa.
The underlying nominal sentence was زَيْدٌ قَائِمٌ. This working mā leaves the ism nominative and changes the predicate to accusative.