Begin with the corresponding active addressed Mudhaari' form.
For the basic singular masculine model:
تَنْصُرُ
The first derivational step is to remove the Mudhaari' prefix.
تَنْصُرُ
becomes
نْصُرُ
First rule: drop the initial Mudhaari' marker before deciding the next step.
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Step 1: Start from the Addressed Mudhaari'
The Imperative Verb (Fi'l Amr) - Concept & Construction
Begin with the corresponding active addressed Mudhaari' form.
For the basic singular masculine model:
تَنْصُرُ
The first derivational step is to remove the Mudhaari' prefix.
تَنْصُرُ
becomes
نْصُرُ
First rule: drop the initial Mudhaari' marker before deciding the next step.