The same root can undergo different weak-radical operations in different patterns.
قَالَ — يَقُولُ has an active imperfect with wāw preserved after vowel transfer under Rule 5.
قِيلَ — يُقَالُ has a passive imperfect with alif after transfer plus substitution under Rule 6.
بَاعَ — يَبِيعُ retains yāʾ, whereas passive بِيعَ — يُبَاعُ shows alif in its imperfect.
The verbal pattern (active or passive) helps determine the surface form along with the root.
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Active versus Passive Imperfect
Hollow Verbs: Seven Iʿlāl Rules and Three Short Paradigms
The same root can undergo different weak-radical operations in different patterns.
قَالَ — يَقُولُ has an active imperfect with wāw preserved after vowel transfer under Rule 5.
قِيلَ — يُقَالُ has a passive imperfect with alif after transfer plus substitution under Rule 6.
بَاعَ — يَبِيعُ retains yāʾ, whereas passive بِيعَ — يُبَاعُ shows alif in its imperfect.
The verbal pattern (active or passive) helps determine the surface form along with the root.