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What is the formula to turn an active past verb فَعَلَ into passive past?

Conjugating the Passive Positive Past Tense (Maadhi Majhool)

• Change final letter to Sukoon
• Give Fa-letter a Dhummah (پیش) and Ayn-letter a Kasrah (زیر)
• Give Fa-letter a Kasrah and Laam-letter a Dhummah
• Add a prefix Alif at the beginning