If the first remaining letter is silent, add Hamzat-ul-Wasl at the beginning so the form can be pronounced.
Example after removing the Mudhaari' prefix:
نْصُرُ
The initial Noon is silent, so a helper Hamza is required.
The next question is: which vowel should that Hamza carry?
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Case B: The First Remaining Letter Is Silent
The Imperative Verb (Fi'l Amr) - Concept & Construction
If the first remaining letter is silent, add Hamzat-ul-Wasl at the beginning so the form can be pronounced.
Example after removing the Mudhaari' prefix:
نْصُرُ
The initial Noon is silent, so a helper Hamza is required.
The next question is: which vowel should that Hamza carry?