The Dictionary distinguishes between eight primary Verb Forms:

Forms 2 & 5 provide the template for quadrilireal verbs too:

One more rare, non-productive form exists, with only a handful of attested terms:

Additionally, there is one form that is mainly retained in learned borrowings from Standard Arabic & so is not treated as a form native to the dialect, except for exactly one term: أعطى (ʔaʕṭa "to give").

Forms 4-9 all begin with consonant clusters, meaning epenthetic insertion before onset is possible for all of them. Forms 5 & 6 are thus sometimes represented orthographically with an epenthetic vowel (e.g. اتحمّم). My decision to retain the prescribed spellings — without removing the epenthetic vowel altogether — is to reflect mainstream practices & to avoid confusion, as not all speakers avoid initial consonant clusters.

Depending on its root, a verb may have an appearance that slightly differs from the base pattern; there are five primary Root Types that have an effect on verbal morphology:

Not all Root Types have an effect on every Verb Form. Here is a complete list of the eight Verb Forms:

Normally, the voweling of verbs is always entirely /a/ in the Past Tense & /i/ in the Present Tense. However, some Form 1A & 1B terms reverse that pattern. Additionally, multiple vowelings are possible for the Present Tense. Here are all the possible Form 1 vowelings: