Four Ending Patterns to Recognize

Conjugating the Prohibitive with Heavy Noon (Active & Passive)

Heavy Noon changes the ending in predictable ways without changing the chosen active pattern.

ExampleWhat to notice
لَا تَفْعِلَنَّFathah immediately before Heavy Noon
لَا تَفْعِلَانِّAlif before Heavy Noon; Heavy Noon carries Kasrah
لَا تَفْعِلُنَّDhammah before Heavy Noon in masculine plural
لَا تَفْعِلِنَّKasrah before Heavy Noon in singular feminine Haadhir

Feminine plural uses Alif-e-Faasil: لَا تَفْعِلْنَانِّ.