A geminate or doubled Form I verb has identical second and third radicals: م-د-د in مَدَّ “extend,” ر-د-د in رَدَّ “return; reply,” and م-ر-ر in مَرَّ “pass.” When the two radicals stand together, Arabic normally contracts them under shadda: دّ، رّ. When certain consonant-initial endings follow, the stem unpacks and writes both radicals separately: رَدَدْنَا “we replied,” مَرَرْتُ “I passed.”
This is a morphological class, not a meaning. Geminate verbs can be transitive or intransitive, and their imperfect vowels, maṣdars, and prepositions remain lexical facts. This overview gives the class-wide map. The dedicated lessons on the geminate perfect, the geminate imperfect, jussive, and imperative, geminates in derived Forms, and the full مَدَّ-type paradigm provide the detailed conjugations.
A lexical class with varied principal parts
The safest dictionary record includes perfect, imperfect, maṣdar, and complement frame. The repeated radicals predict contraction; they do not predict the stem vowels or meaning.
| Root | Verified lexical set | Core meaning and valency |
|---|---|---|
| م-د-د | مَدَّ / يَمُدُّ / مَدّ | extend or supply; direct object, often إلى for an endpoint or بـ for what is supplied |
| ر-د-د | رَدَّ / يَرُدُّ / رَدّ | ردّ على “reply to”; ردّ الشيءَ “return or reject something” |
| ش-د-د | شَدَّ / يَشُدُّ / شَدّ | pull or tighten; direct object |
| م-ر-ر | مَرَّ / يَمُرُّ / مُرُور | pass; intransitive, commonly with بـ |
| ف-ر-ر | فَرَّ / يَفِرُّ / فِرَار | flee; intransitive, commonly with من |
| م-ل-ل | مَلَّ / يَمَلُّ / مَلَل، مَلَالَة | become bored or weary; commonly takes من or a direct maṣdar-like object |
ردت الباحثة على الاعتراض في ملحق منفصل.
raddati l-bāḥithatu ʿalā l-iʿtirāḍi fī mulḥaqin munfaṣil.
The researcher responded to the objection in a separate appendix. (Formal.)
مرت الحافلتان بالمحطة من دون أن تتوقفا.
marrati l-ḥāfilatāni bil-maḥaṭṭati min dūni ʾan tatawaqqafā.
The two buses passed the station without stopping. (Formal VSO; singular feminine verb.)
The first example requires على for the sense “reply to.” The second is intransitive and uses بـ for the place passed. English “pass the station” can be transitive, so omitting Arabic بـ is a real transfer error.
Lexical root gemination is not Form II gemination
In مَدَّ, shadda represents radical two plus radical three: م-د-د. Unpacked مَدَدْتُ exposes both. Form II also writes a shadda, but there it repeats only the second radical of an otherwise non-geminate root. دَرَّسَ “teach” is Form II from د-ر-س, not a verb from د-ر-ر. Its third radical س remains visible after رّ.
| Surface form | Analysis | Diagnostic form |
|---|---|---|
| رَدَّ | Form I, root ر-د-د; R2 = R3 | رَدَدْتُ |
| دَرَّسَ | Form II, root د-ر-س; pattern doubles R2 | دَرَّسْتُ, not *دَرَرْسْتُ |
| عَلَّمَ | Form II, root ع-ل-م; pattern doubles R2 | عَلَّمْنَا, not *عَلَلْمْنَا |
درست الأستاذة مساقين في الترجمة هذا الفصل.
darrasati l-ʾustādhatu misāqayni fī t-tarjamati hādhā l-faṣl.
The professor taught two translation courses this term. (Form II from د-ر-س.)
The unvocalized target درست could also represent “I studied” in another context; the spoken form and sentence identify Form II دَرَّسَتْ here. A shadda by itself is therefore not enough to diagnose the root.
The compact contraction map
Contraction is normal when no consonant-initial ending forces the identical radicals apart. Unpacking appears before a defined set of consonant-initial suffixes and in certain mood/command environments.
| Environment | Typical result | Examples |
|---|---|---|
| unsuffixed 3 m.sg. perfect | contracted | مَدَّ، رَدَّ، مَرَّ |
| perfect with vowel-initial ending | contracted | رَدَّتْ، مَرَّا، شَدُّوا |
| perfect with consonant-initial ending | unpacked | رَدَدْتُ، مَرَرْنَا، شَدَدْنَ |
| ordinary imperfect | usually contracted | يَرُدُّ، يَمُرُّ، يَشُدُّ |
| imperfect before feminine-plural ـنَ | unpacked | يَرْدُدْنَ، يَمْرُرْنَ |
| bare singular jussive/imperative | contracted or unpacked standard variants | لَمْ يَرُدَّ / لَمْ يَرْدُدْ؛ رُدَّ / اُرْدُدْ |
The perfect contrast needs a phonological, not merely graphic, explanation. Third-feminine رَدَّتْ contains the vowel-initial ending -at: contracted stem radd- plus -at gives raddat. First-person رَدَدْتُ takes consonant-initial -tu. Arabic unpacks the radicals and exposes the stem vowel: radad-tu. Both forms display ت in Arabic script, but their suffixes do not begin the same way morphologically.
رددت على اعتراض العميل بعد استشارة الفريق القانوني.
radadtu ʿalā ʿtirāḍi l-ʿamīli baʿda stishārati l-farīqi l-qānūniyy.
I responded to the client’s objection after consulting the legal team. (Formal.)
مررنا بمخبز صغير في طريقنا إلى المحطة.
mararnā bimakhbazin ṣaghīrin fī ṭarīqinā ʾilā l-maḥaṭṭa.
We passed a small bakery on our way to the station. (Neutral MSA.)
شددن الحبال قبل أن تشتد الرياح.
shadadna l-ḥibāla qabla ʾan tashtadda r-riyāḥ.
They tightened the ropes before the wind grew stronger. (All-female subject understood.)
These examples deliberately use three roots. The detailed person-by-person distribution belongs on the geminate-perfect page.
The unfolded vowel is lexical
Unpacking does not always insert a. مَدَّ، رَدَّ، شَدَّ، مَرَّ, and فَرَّ expose a in مَدَدْتُ، رَدَدْتُ، شَدَدْتُ، مَرَرْتُ, and فَرَرْتُ. But مَلَّ / يَمَلُّ has first-person مَلِلْتُ, with i between the radicals. No reliable shortcut derives that hidden vowel from the English meaning or the unvocalized citation form.
مللت الانتظار في الطابور، فعدت في اليوم التالي.
maliltu l-intiẓāra fī ṭ-ṭābūri, faʿudtu fī l-yawmi t-tālī.
I got tired of waiting in line, so I returned the next day. (Neutral MSA.)
فررنا من المبنى حين انطلق جرس الإنذار.
fararnā mina l-mabnā ḥīna nṭalaqa jarasu l-ʾindhār.
We fled the building when the alarm went off. (Formal.)
The maṣdar is just as lexical: compare compact رَدّ، شَدّ with مُرُور and فِرَار, and the alternatives مَلَل، مَلَالَة. “Geminate” describes the root’s consonants; it does not assign one verbal-noun pattern.
Imperfect, mood, and feminine plural
The ordinary imperfect generally contracts: يَرُدُّ، يَشُدُّ، يَمُرُّ، يَفِرُّ، يَمَلُّ. This does not mean every geminate has u; يَفِرُّ has i, while يَمَلُّ has a before the doubled consonant. Learn each imperfect with its perfect.
يفر السكان من المنطقة كلما تجدد القصف.
yafirru s-sukkānu mina l-minṭaqati kullamā tajaddada l-qaṣf.
Residents flee the area whenever the shelling resumes. (News register; singular VSO verb before a human plural.)
الموظفات يمررن ببوابة الأمن قبل دخول المختبر.
al-muwaẓẓafātu yamrurna bibawwābati l-ʾamni qabla dukhūli l-mukhtabar.
The women employees pass through the security gate before entering the laboratory. (Subject-first; feminine plural.)
Feminine-plural ـنَ is consonant-initial, so يَمُرُّ unfolds to يَمْرُرْنَ. Its nūn is an agreement ending and remains under indicative, subjunctive, and jussive governors.
For a bare singular, subjunctive stays contracted: لَنْ يَرُدَّ. Jussive can be unpacked لَمْ يَرْدُدْ or contracted لَمْ يَرُدَّ; the fatḥa in the contracted jussive resolves the final cluster and is not a subjunctive marker. The masculine-singular imperative likewise permits unpacked اُرْدُدْ and contracted رُدَّ. These variants and the full agreement forms are treated on the geminate imperfect and imperative page.
لم يرد المحامي على السؤال المتعلق بالعقد.
lam yarudda l-muḥāmī ʿalā s-suʾāli l-mutaʿalliqi bil-ʿaqd.
The lawyer did not answer the question concerning the contract. (Contracted jussive.)
لن يمر القطار بهذه المحطة أثناء أعمال الصيانة.
lan yamurra l-qiṭāru bihādhihi l-maḥaṭṭati ʾathnāʾa ʾaʿmāli ṣ-ṣiyāna.
The train will not pass through this station during maintenance work. (Subjunctive after lan.)
Derived Forms require a second analysis
A geminate root can enter derived Forms: اِمْتَدَّ “extend (intransitively)” is Form VIII from م-د-د, and اِسْتَعَدَّ “prepare” is Form X from ع-د-د. The derived prefix or infix is not part of the root, and the lexical meaning cannot be calculated from “geminate” alone. The derived-Form lesson separates these layers in detail.
امتد الصف إلى خارج المبنى قبل فتح الأبواب.
imtadda ṣ-ṣaffu ʾilā khāriji l-mabnā qabla fatḥi l-ʾabwāb.
The queue extended outside the building before the doors opened. (Formal.)
Common Mistakes
Calling every shadda a geminate root
❌ جذر درس في معنى التعليم هو د ر ر.
Incorrect — دَرَّسَ is Form II from د-ر-س; the pattern doubles its second radical.
✅ درست الأستاذة النحو لطلاب السنة الأولى.
darrasati l-ʾustādhatu n-naḥwa liṭullābi s-sanati l-ʾūlā.
The professor taught grammar to first-year students.
Treating third-feminine -at like first-person -tu
❌ أنا ردت على الرسالة صباحا.
Incorrect for ‘I replied’ — first-person -tu is consonant-initial and requires the unpacked stem رَدَدْتُ.
✅ أنا رددت على الرسالة بعد مراجعة الأرقام.
ʾanā radadtu ʿalā r-risālati baʿda murājaʿati l-ʾarqām.
I replied to the message after checking the figures.
Assuming the unfolded vowel is always a
❌ مللت الانتظار ساعتين.
malaltu l-intiẓāra sāʿatayn
Incorrect reading — the verified first-person form is مَلِلْتُ with i between the radicals.
✅ مللت الانتظار ساعتين من دون أي تحديث.
maliltu l-intiẓāra sāʿatayni min dūni ʾayyi taḥdīth.
I became tired of waiting for two hours without any update.
Using full plural agreement in neutral VSO
❌ شدوا العمال الحبال قبل العاصفة.
Incorrect in neutral formal-MSA VSO — the verb before an overt human plural is singular.
✅ شد العمال الحبال قبل وصول العاصفة.
shadda l-ʿummālu l-ḥibāla qabla wuṣūli l-ʿāṣifa.
The workers tightened the ropes before the storm arrived.
Key Takeaways
- A Form I geminate root has identical R2 and R3; shadda contracts both, while selected environments unpack them.
- Form II دَرَّسَ or عَلَّمَ has pattern-supplied gemination and a non-identical R3: it is a different analysis.
- Perfect -at is vowel-initial and preserves contraction; -tu, -nā, and feminine-plural -na are consonant-initial and expose both radicals.
- Imperfect vowels, unfolded vowels, maṣdars, meanings, and valency remain lexical: compare يَمُرُّ، يَفِرُّ، يَمَلُّ and مَرَرْتُ، فَرَرْتُ، مَلِلْتُ.
- Detailed paradigms belong to the linked perfect, imperfect/imperative, derived-Form, and مَدَّ-type lessons.
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