Both rules describe replacement of alif, but the preceding vowel determines which letter appears.
Preceding vowelResultExample
ḌammaWāwخَوَادِعُ
KasraYāʾمَفَاتِيحُ
Identify the vowel first, then the substitution, while keeping the plural pattern in view. The two rules must not be interchanged.
Opening interactive controls...
Miscellaneous Morphological Explanations: Eight Rules for Wāw, Yāʾ, Alif and Hamzah
Both rules describe replacement of alif, but the preceding vowel determines which letter appears.
Preceding vowelResultExample
ḌammaWāwخَوَادِعُ
KasraYāʾمَفَاتِيحُ
Identify the vowel first, then the substitution, while keeping the plural pattern in view. The two rules must not be interchanged.