Adding نَّ mechanically to every imperfect is insufficient. Dual forms require a special arrangement, and feminine-plural forms include a separating alif after nūn al-niswah before the emphatic ending.
Masculine singular third person: لَيَخَافَنَّ
Masculine dual third person: لَيَخَافَانِّ
Feminine plural third person: لَيَخَفْنَانِّ
These forms preserve the person/number markers while applying emphasis; the resulting endings are not identical across all fourteen positions.
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How Emphasis Affects Person Endings
Complete Conjugation of Khāfa–Yakhāfu: Hollow Wāw from the Samiʿa Class
Adding نَّ mechanically to every imperfect is insufficient. Dual forms require a special arrangement, and feminine-plural forms include a separating alif after nūn al-niswah before the emphatic ending.
Masculine singular third person: لَيَخَافَنَّ
Masculine dual third person: لَيَخَافَانِّ
Feminine plural third person: لَيَخَفْنَانِّ
These forms preserve the person/number markers while applying emphasis; the resulting endings are not identical across all fourteen positions.