Nāʾib al-fāʿil is nominative, but its sign varies by noun class: ḍamma, dual alif, sound-masculine plural wāw and sound-feminine plural ḍamma.
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Proxy-Subject Case Signs
The Passive Verb: Past, Imperfect, and Proxy Subject
Nāʾib al-fāʿil is nominative, but its sign varies by noun class: ḍamma, dual alif, sound-masculine plural wāw and sound-feminine plural ḍamma.