The feminine-plural nūn (nūn al-niswah) marks feminine plural third- and second-person forms. Unlike the nūn of indicative inflection, it is not deleted by the prohibitive; it remains part of the feminine plural form.
يَفْعَلْنَ → لَا يَفْعَلْنَ — let those women not act.
تَفْعَلْنَ → لَا تَفْعَلْنَ — do not act (women).
These forms are already built with their feminine-plural nūn rather than ordinary indicative nūn. Emphatic heavy nūn can also require a separating alif, treated later in the paradigm.
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The feminine-plural nūn remains
The Prohibitive: Active and Passive Paradigms with Emphatic Nūn
The feminine-plural nūn (nūn al-niswah) marks feminine plural third- and second-person forms. Unlike the nūn of indicative inflection, it is not deleted by the prohibitive; it remains part of the feminine plural form.
يَفْعَلْنَ → لَا يَفْعَلْنَ — let those women not act.
تَفْعَلْنَ → لَا تَفْعَلْنَ — do not act (women).
These forms are already built with their feminine-plural nūn rather than ordinary indicative nūn. Emphatic heavy nūn can also require a separating alif, treated later in the paradigm.