When you see Laa before a Mudhaari' verb, check the ending:
• ending unchanged → it may be simple negation
• Sukoon or Noon-drop → it is the prohibitive use taught here
Then read the meaning as forbidding an action.
Core pattern: لَا تَنْصُرْ = Do not help!
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A Simple Recognition Map
The Prohibitive Verb (Fi'l Nahi) - Concept & Construction
When you see Laa before a Mudhaari' verb, check the ending:
• ending unchanged → it may be simple negation
• Sukoon or Noon-drop → it is the prohibitive use taught here
Then read the meaning as forbidding an action.
Core pattern: لَا تَنْصُرْ = Do not help!