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What structural change occurs in the active plural masculine second person command form اِفْعِلُنَّ when Heavy Noon is attached?

Conjugating the Imperative with Heavy Noon (Active & Passive)

• The first letter gets a Kasrah
• The subject pronoun Waaw is dropped, leaving a Dhummah
• An Alif-e-Faasil is inserted
• No change occurs