Anna with its subject and predicate can be interpreted like a verbal noun: anna Zaydan qāʾimun = qiyāmu Zaydin in this context.
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Anna and the Source-Like Clause
Inna and Its Sisters: Six Particles, Meanings, Government and Exceptions
Anna with its subject and predicate can be interpreted like a verbal noun: anna Zaydan qāʾimun = qiyāmu Zaydin in this context.