The second-person feminine singular imperfect is تَفْعَلِينَ. Its yāʾ and inflectional nūn drop before heavy emphasis, while the kasrah immediately before the heavy nūn remains.
تَفْعَلِينَ ← لَتَفْعَلِنَّ — you (one woman) will certainly do.
Compare لَتَفْعَلَنَّ addressed to one man. The prefix is the same, but the kasrah versus fatḥa before the emphatic nūn distinguishes the addressee's gender. This vowel matters in accurate translation.
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Second-person feminine singular takes kasrah
Emphatic Lām and the Heavy and Light Nūn Paradigms
The second-person feminine singular imperfect is تَفْعَلِينَ. Its yāʾ and inflectional nūn drop before heavy emphasis, while the kasrah immediately before the heavy nūn remains.
تَفْعَلِينَ ← لَتَفْعَلِنَّ — you (one woman) will certainly do.
Compare لَتَفْعَلَنَّ addressed to one man. The prefix is the same, but the kasrah versus fatḥa before the emphatic nūn distinguishes the addressee's gender. This vowel matters in accurate translation.