A maṣdar is a verbal noun that names an action or state without specifying a person or tense. The verbal nouns of unaugmented triliteral verbs do not all follow one compulsory pattern; attested usage is important.
نَصَرَ — نَصْرٌ: helping.
ضَرَبَ — ضَرْبٌ: striking.
سَمِعَ — سَمْعٌ: hearing.
فَتَحَ — فَتْحٌ: opening.
كَرُمَ — كَرَمٌ: nobility/generosity.
حَسِبَ — حِسَابٌ: calculation.
Learning a verb's class does not eliminate the need to learn its proper verbal noun.
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Verbal nouns and their classes
Verb Classes and the Six Unaugmented Triliteral Patterns
A maṣdar is a verbal noun that names an action or state without specifying a person or tense. The verbal nouns of unaugmented triliteral verbs do not all follow one compulsory pattern; attested usage is important.
نَصَرَ — نَصْرٌ: helping.
ضَرَبَ — ضَرْبٌ: striking.
سَمِعَ — سَمْعٌ: hearing.
فَتَحَ — فَتْحٌ: opening.
كَرُمَ — كَرَمٌ: nobility/generosity.
حَسِبَ — حِسَابٌ: calculation.
Learning a verb's class does not eliminate the need to learn its proper verbal noun.