The ordinary verb-first form is qāma al-Zaydūna. The source labels qāmū al-Zaydūna as weak relative to that norm.
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The Less Common Masculine Plural Pattern
Feminine Tāʾ in the Past Tense: Form and Agreement
The ordinary verb-first form is qāma al-Zaydūna. The source labels qāmū al-Zaydūna as weak relative to that norm.