Laysa is a defective verb; Zaydun is its nominative subject. Bāʾ is additional; mutʿabin is its predicate, genitive in form and accusative in syntactic position.
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Parsing Laysa with Additional Bāʾ
Additional Particles: Seven Forms, Emphasis and Syntactic Case
Laysa is a defective verb; Zaydun is its nominative subject. Bāʾ is additional; mutʿabin is its predicate, genitive in form and accusative in syntactic position.