The six standard triliteral unaugmented classes are distinguished primarily by the vowel of the second radical in the perfect and imperfect:
Word / formMeaning / explanation
نَصَرَ يَنْصُرُfaʿala yafʿulu.
ضَرَبَ يَضْرِبُfaʿala yafʿilu.
سَمِعَ يَسْمَعُfaʿila yafʿalu.
فَتَحَ يَفْتَحُfaʿala yafʿalu.
كَرُمَ يَكْرُمُfaʿula yafʿulu.
حَسِبَ يَحْسِبُfaʿila yafʿilu.
A perfect form alone may fit multiple classes: learn its imperfect alongside it.
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Verb Classes and the Six Unaugmented Triliteral Patterns
The six standard triliteral unaugmented classes are distinguished primarily by the vowel of the second radical in the perfect and imperfect:
Word / formMeaning / explanation
نَصَرَ يَنْصُرُfaʿala yafʿulu.
ضَرَبَ يَضْرِبُfaʿala yafʿilu.
سَمِعَ يَسْمَعُfaʿila yafʿalu.
فَتَحَ يَفْتَحُfaʿala yafʿalu.
كَرُمَ يَكْرُمُfaʿula yafʿulu.
حَسِبَ يَحْسِبُfaʿila yafʿilu.
A perfect form alone may fit multiple classes: learn its imperfect alongside it.