The three source paradigms differ in the vowel on the middle radical.
Weight
Middle-radical vowel
Simple example
يَفْعَلُ
Fatḥah
هُوَ يَفْتَحُ الْبَابَ
يَفْعِلُ
Kasrah
هُوَ يَضْرِبُ الْكُرَةَ
يَفْعُلُ
Ḍammah
هُوَ يَكْتُبُ الدَّرْسَ
The table compares pronunciation and form only; each example still has its own lexical meaning.
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Present-Tense Verb: Signs and Three Paradigms
The three source paradigms differ in the vowel on the middle radical.
Weight
Middle-radical vowel
Simple example
يَفْعَلُ
Fatḥah
هُوَ يَفْتَحُ الْبَابَ
يَفْعِلُ
Kasrah
هُوَ يَضْرِبُ الْكُرَةَ
يَفْعُلُ
Ḍammah
هُوَ يَكْتُبُ الدَّرْسَ
The table compares pronunciation and form only; each example still has its own lexical meaning.