The same two-hamzah rule appears in two other Form IV constructions:
أُؤْمِنَ → أُومِنَ — ḍammah on the first hamzah calls for wāw; this is the passive perfect.
إِئْمَانًا → إِيمَانًا — kasrah on the first hamzah calls for yāʾ; this is the verbal noun.
One root can consequently display alif, wāw and yāʾ in different derivatives. The determining factor is the vowel on the preceding hamzah, not arbitrary spelling preference.
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The Patterns أُومِنَ and إِيمَانًا
Rules of Hamzated Forms: Lightening, Substitution, Elision and Short Paradigms
The same two-hamzah rule appears in two other Form IV constructions:
أُؤْمِنَ → أُومِنَ — ḍammah on the first hamzah calls for wāw; this is the passive perfect.
إِئْمَانًا → إِيمَانًا — kasrah on the first hamzah calls for yāʾ; this is the verbal noun.
One root can consequently display alif, wāw and yāʾ in different derivatives. The determining factor is the vowel on the preceding hamzah, not arbitrary spelling preference.