Elementary Arabic Morphology 3
Sound and Unsound Verbs
How many forms of verbs without increase letters are there with respect to their letters being sound or weak?
How many types of sound verbs are there?
How many types of unsound verbs are there?
How many types of cluster verbs are there?
When is a verb considered a verb with a hamza, a verb with double letters, or a verb with weak letters?
There are two types of verbs without increase letters: sound verbs, ex: أخَذَ and unsound verbs, ex: وَعَدَ.
There are three types of sound verbs: One, perfect verbs. These are verbs that do not have a hamza in its root nor any duplicate letters, for example: نَصَرَ. Two, Double-lettered verbs. These are verbs that have two identical letters in there root, for example: مَدَّ. Three, verbs that have a hamza in their root, for example: أکَلَ.
There are three types of unsound verbs: One, quasi-sound verbs. These are verbs whose first root letter is a weak letter, for example: وَعَدَ. Two, hollow verbs. These are verbs whose second root letter is a weak letter, for example: قالَ. Third, defective verbs. These are verbs whose third root letter is a weak letter, for example: دَعا.
There are two types of cluster verbs: a cluster verb whose first and third root letters are weak, for example: وَفیَ and a cluster verb whose second and third root letters are weak, for example: شَویَ.
Verbs with a hamza, a verb with double letters, or a verb with weak letters are only considered sound or unsound when the mentioned letters are in its root.