There are two kinds of emphatic nūn. The heavy nūn (thaqīlah) carries a shaddah; the light nūn (khafīfah) is a sākin nūn without shaddah.
لَيَفْعَلَنَّ — heavy nūn: he will certainly do it.
لَيَفْعَلَنْ — light nūn: he will certainly do it.
Both emphasise, but their morphology differs. The heavy-nūn table has forms in all fourteen person positions; the light-nūn table deliberately omits six positions. They are not freely interchangeable everywhere.
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Two forms of the emphatic nūn
Emphatic Lām and the Heavy and Light Nūn Paradigms
There are two kinds of emphatic nūn. The heavy nūn (thaqīlah) carries a shaddah; the light nūn (khafīfah) is a sākin nūn without shaddah.
لَيَفْعَلَنَّ — heavy nūn: he will certainly do it.
لَيَفْعَلَنْ — light nūn: he will certainly do it.
Both emphasise, but their morphology differs. The heavy-nūn table has forms in all fourteen person positions; the light-nūn table deliberately omits six positions. They are not freely interchangeable everywhere.