What is Form I in Arabic?

Form I (also written Form 1 or the fa'ala pattern) is the basic, underived verb pattern built directly on a three-consonant root. The nine other major forms add prefixes, doubled consonants, or long vowels to derive related meanings like causative or reflexive, but Form I is the foundation taught first.

Why does Arabic have dual forms?

Arabic grammatically distinguishes exactly two from three-or-more, so alongside singular and plural it has a dual number used for pairs. Verbs therefore have separate dual conjugations in the second and third persons, which this table includes.

How do the perfect and imperfect tenses differ?

The perfect (past) tense is built with suffixes only on the root vowel pattern fa'al-, as in katab-tu 'I wrote'. The imperfect (present/future) uses a set of prefixes (a-, ta-, ya-, na-) plus sometimes suffixes around the stem -ktub-, as in a-ktub-u 'I write'.

Does Arabic mark gender on verbs?

Yes. From the second person onward Arabic distinguishes masculine and feminine, including in the plural and dual. The first person (I, we) is the only person that does not mark gender. This is why the table has separate masculine and feminine rows.

What are the imperfect stem vowels?

Form I imperfect verbs take one of three stem vowels (a, i, or u) that is not predictable from the root and must be memorized per verb. This tool defaults to u for illustration; substitute the correct stem vowel for your specific verb when you know it.

Arabic Verb Conjugation Reference

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Arabic conjugates its verbs by mapping a three-consonant root onto fixed templates. Form I — the basic fa’ala pattern — is the starting point. This tool takes the three root letters and builds the complete paradigm for the perfect (past) and imperfect (present) tenses across every person, gender, and number, including the dual.

How it works

Write the root as three consonants C1-C2-C3 (for kataba, “to write”, that is k-t-b). The two tenses use different machinery:

perfect (past):     C1aC2aC3 + personal SUFFIX        (katab-tu = I wrote)
imperfect (present): PREFIX + C1C2uC3 + personal suffix (a-ktub-u = I write)

The perfect uses suffixes only. The imperfect uses a prefix (a- 1sg, na- 1pl, ta- 2nd and 3fsg, ya- 3rd) plus, in the duals and plurals, an additional suffix. Arabic marks gender from the second person onward and has a distinct dual for pairs, giving thirteen cells in the full paradigm. The imperfect stem vowel (the vowel on C2) is lexically fixed per verb — a, i, or u — and must be learned individually; this tool illustrates with u.

Example and notes

For k-t-b: the perfect “she wrote” is katab-at → katabat; “they (m.) wrote” is katab-uu → katabuu. The imperfect “I write” is a-ktub-u → aktubu; “you (f.sg) write” is ta-ktub-iina → taktubiina. Note the duals such as “the two of them (m.) write,” ya-ktub-aani → yaktubaani. Substitute the correct stem vowel for your specific verb (for example yajlisu “he sits” uses i), and remember that weak or doubled roots follow modified rules not shown in this sound-root paradigm.