Several imperfect forms end in -āni, -ūna or -īna. The final nūn in these endings is the inflectional nūn. It remains in the indicative but is deleted in both the subjunctive and jussive.
Word / formMeaning / explanation
يَفْعَلَانِ ← لَنْ يَفْعَلَاthe two males will not do.
يَفْعَلُونَ ← لَنْ يَفْعَلُواthe males will not do.
تَفْعَلِينَ ← لَنْ تَفْعَلِيyou (fem. singular) will not do.
The retained alif, wāw or yāʾ still identifies the dual, masculine plural or second-person feminine singular position.