The active masculine second-person heavy-nūn positions are:
Word / formMeaning / explanation
لَتَفْعَلَنَّsecond masculine singular
لَتَفْعَلَانِّsecond masculine dual
لَتَفْعَلُنَّsecond masculine plural
They mean: you (one man), you (two men), and you (men) will certainly do it. The second-person prefix tāʾ remains. A fatḥa before the emphatic nūn marks singular, a retained alif marks dual, and the preceding ḍamma identifies masculine plural.
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Emphatic Lām and the Heavy and Light Nūn Paradigms
The active masculine second-person heavy-nūn positions are:
Word / formMeaning / explanation
لَتَفْعَلَنَّsecond masculine singular
لَتَفْعَلَانِّsecond masculine dual
لَتَفْعَلُنَّsecond masculine plural
They mean: you (one man), you (two men), and you (men) will certainly do it. The second-person prefix tāʾ remains. A fatḥa before the emphatic nūn marks singular, a retained alif marks dual, and the preceding ḍamma identifies masculine plural.