A general formation rule is to prefix لَـ to the active or passive imperfect, remove any applicable indicative inflectional nūn, and attach an emphatic nūn. The person endings are not treated identically in every form.
يَفْعَلُ ← لَيَفْعَلَنَّ — he will certainly do it.
تُفْعَلُ ← لَتُفْعَلَنَّ — it will certainly be done to her.
The first example is active and the second passive. Emphasis is present in both, while the internal vowel pattern continues to distinguish the voices.
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How the prefix and suffix work together
Emphatic Lām and the Heavy and Light Nūn Paradigms
A general formation rule is to prefix لَـ to the active or passive imperfect, remove any applicable indicative inflectional nūn, and attach an emphatic nūn. The person endings are not treated identically in every form.
يَفْعَلُ ← لَيَفْعَلَنَّ — he will certainly do it.
تُفْعَلُ ← لَتُفْعَلَنَّ — it will certainly be done to her.
The first example is active and the second passive. Emphasis is present in both, while the internal vowel pattern continues to distinguish the voices.