To identify a triliteral unaugmented class reliably:
1. Identify the three radicals, separating any derivational extras.
2. Read the fully vocalised third-person masculine singular perfect.
3. Check the attested third-person masculine singular imperfect.
4. Compare the second radical's vowels with the six class patterns.
For example, عَلِمَ يَعْلَمُ has kasrah then fatḥah on lām (its second radical), making it the samiʿa class rather than the fataḥa class.
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Reliable identification of a verb class
Verb Classes and the Six Unaugmented Triliteral Patterns
To identify a triliteral unaugmented class reliably:
1. Identify the three radicals, separating any derivational extras.
2. Read the fully vocalised third-person masculine singular perfect.
3. Check the attested third-person masculine singular imperfect.
4. Compare the second radical's vowels with the six class patterns.
For example, عَلِمَ يَعْلَمُ has kasrah then fatḥah on lām (its second radical), making it the samiʿa class rather than the fataḥa class.