About the Arabic verb ﻞِﻌﻔﻟﺍ
The majority of Arabic verbs are called tri-literal because they are derived from three consonants, called a root. Some verbs are derived from four consonants; such verbs are called quadri-literal. Deriving verbs from their roots follows set patterns. In Modern Standard Arabic (MSA) there are 10 common tri-literal verb forms. These forms are designated I through X. One difference between the verb forms is in the stem constituent of each. Again, the tri-literal verb is derived from a tri-co.