Recognize agent and patient participles using the verb's root and morphological process.
VerbActive participlePassive participle
قَالَقَائِلٌمَقُولٌ
بَاعَبَائِعٌمَبِيعٌ
خَافَخَائِفٌمَخُوفٌ
رَمَىرَامٍمَرْمِيٌّ
دَعَادَاعٍمَدْعُوٌّ
The hamzah in قَائِلٌ does not make the original root hamzated; the root is q–w–l and the hamzah is produced by the active-participle pattern.