مَا زَيْدٌ قَائِمًا — Zaydun: ism of working mā; qāʾiman: its khabar.
لَا طَالِبٌ غَائِبًا — ṭālibun: ism of lā like laysa; ghāʾiban: its khabar.
لَا رَجُلَ قَائِمٌ — rajula: ism of generic lā; qāʾimun: its khabar.
Identify the specific particle use before assigning case and syntactic role.