First recognize the ending; then learn its name.
In يَفْعَلَانِ, يَفْعَلُونَ and تَفْعَلِينَ, the final nūn belongs to the inflectional ending. This is called نونِ اعرابی—the inflectional nūn.
It is not the feminine-plural nūn of يَفْعَلْنَ. Keep the two endings distinct when identifying the second and third groups.
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Three Groups of Imperfect Forms
First recognize the ending; then learn its name.
In يَفْعَلَانِ, يَفْعَلُونَ and تَفْعَلِينَ, the final nūn belongs to the inflectional ending. This is called نونِ اعرابی—the inflectional nūn.
It is not the feminine-plural nūn of يَفْعَلْنَ. Keep the two endings distinct when identifying the second and third groups.