An Arabic verb packages several kinds of information at once. Its stem presents an event through the perfect or imperfect system; prefixes and suffixes identify person, number, and gender; particles can govern the imperfect's mood; internal vowels can mark active or passive voice; and a derived Form places the verb inside a larger lexical family.
This page is a map, not a wall of paradigms. The central example is regular Form I كَتَبَ — يَكْتُبُ — كِتَابَةً “write,” from root ك-ت-ب. Those verified principal parts are more useful than a decorative root chart because they tell you the actual perfect, imperfect, and verbal noun that this verb uses.
Two stem systems: perfect and imperfect
The perfect normally presents an event as complete or bounded. The imperfect presents it from within—as ongoing, repeated, expected, or not yet bounded. Context turns those viewpoints into natural English tenses.
كتب سامي الرسالة مساء أمس.
kataba sāmī r-risālata masāʾa ʾams.
Sami wrote the letter yesterday evening.
يكتب سامي الآن رسالة إلى الجامعة.
yaktubu sāmī l-ʾāna risālatan ʾilā l-jāmiʿa(h).
Sami is now writing a letter to the university.
يكتب سامي إلى أسرته كل أسبوع.
yaktubu sāmī ʾilā ʾusratihi kulla ʾusbūʿ.
Sami writes to his family every week.
The same imperfect يكتب becomes English “is writing” with الآن and “writes” with كل أسبوع. Arabic does not need a different stem for the English progressive. Conversely, a perfect may correspond to English simple past or present perfect depending on discourse; do not replace aspect with a one-to-one English tense label.
Agreement identifies the participants
Arabic finite verbs agree with their subject in person (I, you, he/she), number (singular, dual, plural), and often gender. Perfect forms mainly add suffixes; imperfect forms combine prefixes and suffixes.
| Subject | Perfect | Imperfect indicative |
|---|---|---|
| هو, he | كَتَبَ | يَكْتُبُ |
| هي, she | كَتَبَتْ | تَكْتُبُ |
| هما, they two (f.) | كَتَبَتَا | تَكْتُبَانِ |
| هم, they (m./mixed) | كَتَبُوا | يَكْتُبُونَ |
| أنا, I | كَتَبْتُ | أَكْتُبُ |
| نحن, we | كَتَبْنَا | نَكْتُبُ |
The endings often make an independent pronoun unnecessary. كتبتُ already means “I wrote,” while كتبتْ means “she wrote.” Fully vocalized text reveals the contrast even though ordinary unvocalized كتبت can represent several forms.
كتبت الطالبة الملخص وأرسلته إلى أستاذتها.
katabati ṭ-ṭālibatu l-mulakhkhaṣa wa-ʾarsalat-hu ʾilā ʾustādhatihā.
The student wrote the summary and sent it to her professor.
الطالبتان كتبتا الملخص معا.
aṭ-ṭālibatāni katabatā l-mulakhkhaṣa maʿan.
The two female students wrote the summary together.
Word order changes the amount of agreement
With the subject before the verb (SVO), the verb normally shows full agreement: الطلاب كتبوا. In neutral verb-first order (VSO), a preceding verb is normally singular even before a dual or plural overt subject: كتب الطلاب. It still shows appropriate gender in the singular where the system requires it.
كتب الطلاب التقرير بعد الزيارة.
kataba ṭ-ṭullābu t-taqrīra baʿda z-ziyāra(h).
The students wrote the report after the visit. (Neutral verb-first order.)
الطلاب كتبوا التقرير بعد الزيارة.
aṭ-ṭullābu katabū t-taqrīra baʿda z-ziyāra(h).
The students wrote the report after the visit. (Subject-first order with full plural agreement.)
This asymmetry is grammatical, not optional carelessness. It also explains why counting the subject alone is insufficient: first locate the verb relative to its overt subject.
Mood belongs to the imperfect
The ordinary imperfect indicative has endings such as ـُ in يكتبُ. Certain particles govern another mood. لن selects the subjunctive, here يكتبَ; لم selects the jussive, here يكتبْ, and gives the clause past negative meaning.
هو يكتب التقرير الآن.
huwa yaktubu t-taqrīra l-ʾān.
He is writing the report now. (Indicative yaktubu.)
لن يكتب التقرير اليوم.
lan yaktuba t-taqrīra l-yawm.
He will not write the report today. (Subjunctive after lan.)
لم يكتب التقرير أمس.
lam yaktub t-taqrīra ʾams.
He did not write the report yesterday. (Jussive after lam.)
Mood is not a free choice based on English tense. The Arabic governor determines it. The perfect itself does not alternate among indicative, subjunctive, and jussive forms.
Active and passive voice can share one spelling
Arabic marks passive voice primarily through internal vowels. In unvocalized prose, context and syntax often distinguish كَتَبَ “he wrote” from كُتِبَ “it was written.” The subject of an active clause is the agent; the nominative element after a passive verb is the affected participant.
كتب المقرر محضر الجلسة قبل الظهر.
kataba l-muqarriru maḥḍara l-jalsati qabla ẓ-ẓuhr.
The rapporteur wrote the meeting minutes before noon. (Active.)
كتب المحضر قبل مغادرة الأعضاء.
kutiba l-maḥḍaru qabla mughādarati l-ʾaʿḍāʾ.
The minutes were written before the members left. (Passive.)
English usually adds be to form a passive. Arabic changes the verb's vowel pattern, so a reliable reading of unvocalized text must use clause structure, not letters alone.
Derived Forms are lexical families
The numbered Forms I–X describe recurring stem shapes. Form I كتب is the basic lexical verb “write”; Form III كاتب has attested meanings including “correspond with”; Form VIII اكتتب means “subscribe” or “take up shares” in relevant contexts. The meanings are related historically but not computed by one formula.
كاتبت الباحثة الأرشيف للحصول على نسخة من الوثيقة.
kātabati l-bāḥithatu l-ʾarshīfa lil-ḥuṣūli ʿalā nuskhatin mina l-wathīqa(h).
The researcher corresponded with the archive to obtain a copy of the document.
Learn each actual verb with its Form, principal parts, meanings, and complements. Form X اِسْتَخْدَمَ — يَسْتَخْدِمُ — اِسْتِخْدَامًا “use,” for example, is from خ-د-م and normally takes a direct object. See Form X for that pattern's full behavior.
Irregular shape does not mean irregular meaning
Weak, hamzated, and geminate roots undergo predictable classes of stem change, but each verb's actual principal parts must be verified:
| Class | Verified principal parts | What to notice |
|---|---|---|
| hollow weak, ق-و-ل | قَالَ — يَقُولُ — قَوْلًا | middle و surfaces outside قال |
| hamzated, ق-ر-ء | قَرَأَ — يَقْرَأُ — قِرَاءَةً | hamza remains a radical but changes seat |
| geminate, م-د-د | مَدَّ — يَمُدُّ — مَدًّا | two د radicals contract under shadda |
قلنا الحقيقة ومددنا الموعد حتى الخميس.
qulnā l-ḥaqīqata wa-madadnā l-mawʿida ḥattā l-khamīs.
We told the truth and extended the deadline until Thursday.
The regular-looking inventions qālnā and maddnā are not the forms. قلنا shortens the hollow stem, while مددنا unfolds the geminate radicals.
Common Mistakes
Substituting an English tense mechanically
❌ يكتب سامي الرسالة أمس.
Incorrect for a completed event yesterday — the ungoverned imperfect presents the wrong viewpoint here.
✅ كتب سامي الرسالة أمس.
kataba sāmī r-risālata ʾams.
Sami wrote the letter yesterday.
Losing feminine dual agreement
❌ الطالبتان كتبوا الملخص.
Incorrect — a subject-first feminine dual requires كتبتا, not masculine plural كتبوا.
✅ الطالبتان كتبتا الملخص.
aṭ-ṭālibatāni katabatā l-mulakhkhaṣ.
The two female students wrote the summary.
Using full plural agreement in neutral VSO
❌ كتبوا الطلاب التقرير.
Incorrect as neutral verb-first order with an overt plural subject — use singular كتب before الطلاب.
✅ كتب الطلاب التقرير.
kataba ṭ-ṭullābu t-taqrīr.
The students wrote the report.
Ignoring the particle's mood government
❌ لن يكتب التقرير اليوم.
lan yaktubu t-taqrīra l-yawm
Incorrect reading — lan governs subjunctive yaktuba, not indicative yaktubu.
✅ لن يكتب التقرير اليوم.
lan yaktuba t-taqrīra l-yawm.
He will not write the report today.
Regularizing weak or geminate stems
❌ قالنا الحقيقة ومدنا الموعد.
Incorrect — the attested first-person plural forms are قلنا and مددنا.
✅ قلنا الحقيقة ومددنا الموعد.
qulnā l-ḥaqīqata wa-madadnā l-mawʿid.
We told the truth and extended the deadline.
Key Takeaways
- Perfect and imperfect are stem systems whose viewpoint combines with context to create tense readings.
- Verb endings identify person, number, and gender; neutral VSO and subject-first SVO differ in plural and dual agreement.
- Governors such as لن and لم select imperfect mood; the perfect has no mood contrast.
- Internal vowels can distinguish active from passive even when ordinary unvocalized spelling is identical.
- Derived Forms organize attested lexical verbs, not automatic meanings.
- Verified principal parts expose the real behavior of regular, weak, hamzated, and geminate verbs.
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