Aḥsin is the fixed exclamatory verb in an imperative-like form; bā is additional; Zaydin is outwardly genitive but functions as the nominative-position subject in the dominant parsing.
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Parsing the Second Pattern
The Two Exclamatory Verbs: Forms, Rules and Parsing
Aḥsin is the fixed exclamatory verb in an imperative-like form; bā is additional; Zaydin is outwardly genitive but functions as the nominative-position subject in the dominant parsing.