Accusative tanwīn typically turns into an ā-vowel at pause, such as Zayda. Tāʾ marbūṭa is an important exception.
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Pausing on Accusative Tanwīn
Tanwīn: Five Types, Their Function, and Omission
Accusative tanwīn typically turns into an ā-vowel at pause, such as Zayda. Tāʾ marbūṭa is an important exception.