A hollow verb has wāw or yāʾ as its middle root letter, e.g., q-w-l and b-y-ʿ. Its passive requires weak-letter adjustments.
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Hollow Verbs Need Special Treatment
The Passive Verb: Past, Imperfect, and Proxy Subject
A hollow verb has wāw or yāʾ as its middle root letter, e.g., q-w-l and b-y-ʿ. Its passive requires weak-letter adjustments.