Yā is an indeclinable particle; Zaydu is a proper-name vocative built on ḍamma in an accusative syntactic position. Iqraʾ is an imperative with an implicit subject.
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Parsing a Proper-Name Vocative
Vocative Particles: Five Forms, Uses and Parsing
Yā is an indeclinable particle; Zaydu is a proper-name vocative built on ḍamma in an accusative syntactic position. Iqraʾ is an imperative with an implicit subject.