طَوَى — يَطْوِي — اِطْوِ
Translation: He folded — he folds — fold!
قَوِيَ — يَقْوَى — اِقْوَ
Translation: He became strong — he becomes strong — become strong!
In طَوَى the final yāʾ surfaces as alif in the perfect, remains yāʾ in the imperfect and is deleted in the imperative. قَوِيَ instead produces imperfect يَقْوَى, ending with alif maqṣūrah. Both roots have adjacent wāw and yāʾ; distinct morphological patterns explain the different outputs.
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Explaining طَوَى and قَوِيَ
Eight Short Paradigms: Lafīf and Defective Verbs with Morphological Explanations
طَوَى — يَطْوِي — اِطْوِ
Translation: He folded — he folds — fold!
قَوِيَ — يَقْوَى — اِقْوَ
Translation: He became strong — he becomes strong — become strong!
In طَوَى the final yāʾ surfaces as alif in the perfect, remains yāʾ in the imperfect and is deleted in the imperative. قَوِيَ instead produces imperfect يَقْوَى, ending with alif maqṣūrah. Both roots have adjacent wāw and yāʾ; distinct morphological patterns explain the different outputs.