The textbook places six forms side by side: active prohibitive, passive prohibitive, active with heavy nūn, passive with heavy nūn, active with light nūn, and passive with light nūn. The active asks an agent to refrain; the passive asks that an action not be done to someone, leaving the agent unspecified.
Word / formMeaning / explanation
لَا يَفْعَلْlet him not do it.
لَا يُفْعَلْlet it not be done to him.
لَا يَفْعَلَنَّlet him certainly not do it.
لَا يَفْعَلَنْemphatic refusal with light nūn.
The prohibitive starts with lā; it is not built with the imperative or emphatic lām.