صَحِيفَةٌ → صَحَائِفُ
Translation: A written sheet → written sheets.
First locate the radicals ṣ–ḥ–f, then recognize the broken-plural pattern. The pattern supplies an alif; the additional lengthening element after it becomes hamzah. Thus the analysis leads to صَحَائِفُ, not merely to a mechanical spelling with yāʾ such as صَحَايِفُ. The original root radicals remain identifiable.
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How صَحَائِفُ Is Formed
Miscellaneous Morphological Explanations: Eight Rules for Wāw, Yāʾ, Alif and Hamzah
صَحِيفَةٌ → صَحَائِفُ
Translation: A written sheet → written sheets.
First locate the radicals ṣ–ḥ–f, then recognize the broken-plural pattern. The pattern supplies an alif; the additional lengthening element after it becomes hamzah. Thus the analysis leads to صَحَائِفُ, not merely to a mechanical spelling with yāʾ such as صَحَايِفُ. The original root radicals remain identifiable.