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Verbs

Verbs in Literary Arabic are marked for person (first, second, or third), gender, and number. They are conjugated in two major paradigms (past and non-past); two voices (active and passive); and six moods (indicative, imperative, subjunctive, jussive, shorter energetic and longer energetic); the fifth and sixth moods, the energetics, exist only in Classical Arabic but not in MSA. There are two participles, active and passive, and a verbal noun, but no infinitive.

The past and non-past paradigms are sometimes termed perfective and imperfective, indicating the fact that they actually represent a combination of tense and aspect. The moods other than the indicative occur only in the non-past, and the future tense is signaled by prefixing سَـ sa- or سَوْفَ sawfa onto the non-past. The past and non-past differ in the form of the stem (e.g., past كَتَبـ katab- vs. non-past ـكْتُبـ -ktub-), and use completely different sets of affixes for indicating person, number and gender: In the past, the person, number and gender are fused into a single suffixal morpheme, while in the non-past, a combination of prefixes (primarily encoding person) and suffixes (primarily encoding gender and number) are used. The passive voice uses the same person/number/gender affixes but changes the vowels of the stem.

The following shows a paradigm of a regular Arabic verb, كَتَبَ kataba 'to write'. In Modern Standard, the energetic mood, in either long or short form, which has the same meaning, is almost never used.