Verbs
Verbs in Arabic are based on a stem made up of three or four consonants. The set of consonants communicates the basic meaning of a verb. Changes to the vowels in between the consonants, along with prefixes and/or suffixes, specify grammatical functions such as tense, person and number, in addition to changes in the meaning of the verb that embody grammatical concepts such as causative, intensive, passive or reflexive.
Each particular lexical verb is specified by two stems, one used for the past tense and one used for non-past tenses along with as subjunctive and imperative moods. To the former stem, suffixes are added to mark the verb for person, number and gender, while to the latter stem, a combination of prefixes and suffixes are added. (Very approximately, the prefixes specify the person and the suffixes indicate number and gender.) The third person masculine singular past tense form serves as the "dictionary form" used to identify a verb, similar to the infinitive in English. (Arabic has no infinitive.) For example, the verb meaning "write" is often specified as kátab, which actually means "he wrote". In the paradigms below, a verb will be specified as kátab/yíktib (where kátab means "he wrote" and yíktib means "he writes"), indicating the past stem (katab-) and non-past stem (-ktib-, obtained by removing the prefix yi-).
The verb classes in Arabic are formed along two axes. One axis (described as "form I", "form II", etc.) is used to specify grammatical concepts such as causative, intensive, passive or reflexive, and involves varying the stem form. For example, from the root K-T-B "write" is derived form I kátab/yíktib "write", form II káttib/yikáttib "cause to write", form III ká:tib/yiká:tib "correspond", etc. The other axis is determined by the particular consonants making up the root. For example, defective verbs have a W or Y as the last root consonant, which is often reflected in paradigms with an extra final vowel in the stem (e.g. ráma/yírmi "throw" from R-M-Y); meanwhile, hollow verbs have a W or Y as the middle root consonant, and the stems of such verbs appear to have only two consonants (e.g. gá:b/yigí:b "bring" from G-Y-B).
Read more about this topic: Egyptian Arabic, Morphology
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