Compare the same grammatical slot in active and passive voice.
PassiveActiveSlot
سُمِعَسَمِعَPast
يُسْمَعُيَسْمَعُMudhaari'
مَسْمُوْعٌسَامِعٌParticiple
The root stays the same; the pattern tells you whether the form is active or passive.
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Active and Passive Side by Side
Trilateral Bare Regular - Bab 3: Sami'a Yasma'u Introduction
Compare the same grammatical slot in active and passive voice.
PassiveActiveSlot
سُمِعَسَمِعَPast
يُسْمَعُيَسْمَعُMudhaari'
مَسْمُوْعٌسَامِعٌParticiple
The root stays the same; the pattern tells you whether the form is active or passive.