رَمَى comes from ر م ي. The final yāʾ appears as alif maqṣūrah in the perfect, while the underlying yāʾ is visible in the indicative imperfect and other derivatives.
CategoryFormMeaning
Active perfectرَمَىhe threw
Active imperfectيَرْمِيhe throws
Passive perfectرُمِيَit was thrown
Passive imperfectيُرْمَىit is thrown
Active participleرَامٍthrower
Passive participleمَرْمِيٌّthrown
Imperativeاِرْمِthrow!
Prohibitionلا تَرْمِdo not throw!
The final kasrah in اِرْمِ and لا تَرْمِ remains when the weak yāʾ is lost through the jussive process.