Do not treat the active table as 14 separate words. Group the endings by what prohibitive Jazm does.
ExampleEffectForms
لَا يَفْعُلْfinal Dhammah → Sukoon5
لَا يَفْعِلَاNoon-e-I'raabi drops7
لَا يَفْعُلْنَvisible ending remains2
Once the group is clear, the ending becomes easier to predict.
Opening interactive controls...
Conjugating the standard Prohibitive Verb (Active & Passive)
Do not treat the active table as 14 separate words. Group the endings by what prohibitive Jazm does.
ExampleEffectForms
لَا يَفْعُلْfinal Dhammah → Sukoon5
لَا يَفْعِلَاNoon-e-I'raabi drops7
لَا يَفْعُلْنَvisible ending remains2
Once the group is clear, the ending becomes easier to predict.