يَا زَيْدُ: built on ḍamma, accusative position.
يَا زَيْدَانِ: built on alif, accusative position.
يَا زَيْدُونَ: built on wāw, accusative position.
Do not confuse a fixed ending with the syntactic case position.
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Fixed Form vs Syntactic Position
Al-Munādā: Vocative Types and Rules
يَا زَيْدُ: built on ḍamma, accusative position.
يَا زَيْدَانِ: built on alif, accusative position.
يَا زَيْدُونَ: built on wāw, accusative position.
Do not confuse a fixed ending with the syntactic case position.