The perfect of a geminate Form I verb has two visibly different stems. مَدَّ “he extended” contracts the second and third radicals of root م-د-د under shadda, but مَدَدْتُ “I extended” unfolds them before the subject suffix ـتُ. The same rule gives مَدَّتْ “she extended” but مَدَدْنَ “they (f.) extended.”
English adds the same past ending regardless of subject and therefore gives learners no intuition for this split. In Arabic, first identify whether the suffix begins with a vowel or a consonant; then choose the contracted or unfolded stem. This page concentrates on perfect subject suffixes. The neighboring مَدَّ-type overview connects the alternation to the imperfect and command.
The complete مَدَّ perfect paradigm
The verified principal parts are مَدَّ / يَمُدُّ / مَدٌّ, Form I, root م-د-د. In the following table, shadda in مَدَّ represents both final radicals. In مَدَدْتُ, they appear separately.
| Person | Perfect | Meaning | Stem |
|---|---|---|---|
| هو | مَدَّ | he extended | contracted |
| هي | مَدَّتْ | she extended | contracted |
| هما (m.) | مَدَّا | they two extended | contracted |
| هما (f.) | مَدَّتَا | they two (f.) extended | contracted |
| هم | مَدُّوا | they (m.) extended | contracted |
| هن | مَدَدْنَ | they (f.) extended | unfolded |
| أنتَ | مَدَدْتَ | you (m.sg.) extended | unfolded |
| أنتِ | مَدَدْتِ | you (f.sg.) extended | unfolded |
| أنتما | مَدَدْتُمَا | you two extended | unfolded |
| أنتم | مَدَدْتُمْ | you (m.pl.) extended | unfolded |
| أنتن | مَدَدْتُنَّ | you (f.pl.) extended | unfolded |
| أنا | مَدَدْتُ | I extended | unfolded |
| نحن | مَدَدْنَا | we extended | unfolded |
مد المهندس الكابل بين المبنيين
madda l-muhandisu l-kābila bayna l-mabnayayni
The engineer ran the cable between the two buildings. (Formal.)
مدت المهندسة الكابل تحت الأرض
maddati l-muhandisatu l-kābila taḥta l-ʾarḍ
The engineer ran the cable underground. (Formal; feminine singular.)
مدا الحبل بين الشجرتين قبل نصب الخيمة
maddā l-ḥabla bayna sh-shajaratayni qabla naṣbi l-khayma
The two men stretched the rope between the two trees before pitching the tent. (Formal.)
مدوا شبكة المياه إلى القرى البعيدة
maddū shabakata l-miyāhi ʾilā l-qurā l-baʿīda
They extended the water network to the remote villages. (Formal, subject understood.)
The endings ـتْ، ـا، ـتَا، ـوا begin phonologically with a vowel or allow the contracted consonant to flow directly into the ending. They therefore keep مَدّـ. Written مدت is ambiguous without vowels: it can be maddat “she extended,” not madadtu “I extended.” The subject and vocalization resolve it.
Consonant-led suffixes expose both radicals
The suffix set ـتُ، ـتَ، ـتِ، ـتُمَا، ـتُمْ، ـتُنَّ، ـنَا and feminine-plural ـنَ uses the unfolded stem. Arabic inserts the lexical stem vowel between the identical radicals and places sukūn on the second: مَدَدْتُ, not مَدَّتُ.
مددت صلاحية الاشتراك شهرا إضافيا
madadtu ṣalāḥiyyata l-ishtirāki shahran ʾiḍāfiyyan
I extended the subscription by one additional month. (Formal.)
هل مددت فترة الحجز قبل انتهاء المهلة؟
hal madadta fatrata l-ḥajzi qabla ntihāʾi l-muhla?
Did you extend the booking period before the deadline expired? (Addressing one man; formal.)
مددنا أنابيب الري عبر الحقلين
madadnā ʾanābība r-rayyi ʿabra l-ḥaqlayn
We laid irrigation pipes across the two fields. (Formal.)
مددن أذرعهن أمام الكاميرا لإظهار التمرين
madadna ʾadhruʿahunna ʾamāma l-kāmīrā liʾiẓhāri t-tamrīn
They (f.) extended their arms toward the camera to demonstrate the exercise. (Formal.)
مَدَدْنَ and مَدَدْنَا differ only in the subject ending after the unfolded stem: short -na “they (f.)” versus long -nā “we.” Unvocalized مددنا can therefore be ambiguous in isolation; sentence context and the spoken form decide.
The inserted stem vowel is lexical
Unfolding does not mean “write the doubled consonant twice and always insert a.” The vowel belongs to the verb’s historical and lexical perfect pattern. مَدَّ gives مَدَدْتُ, شَدَّ / يَشُدُّ “pull tight” gives شَدَدْتُ, but مَلَّ / يَمَلُّ “become bored” gives مَلِلْتُ. The citation form hides this contrast because contraction removes the vowel between the identical radicals.
| Verified set | 1 sg. perfect | Meaning |
|---|---|---|
| مَدَّ / يَمُدُّ | مَدَدْتُ | I extended |
| شَدَّ / يَشُدُّ | شَدَدْتُ | I tightened / pulled |
| رَدَّ / يَرُدُّ | رَدَدْتُ | I returned / replied |
| مَلَّ / يَمَلُّ | مَلِلْتُ | I became bored |
شددت الحزام لأن الطريق الجبلي كان وعرا
shadadtu l-ḥizāma liʾanna ṭ-ṭarīqa l-jabaliyya kāna waʿran
I tightened the belt because the mountain road was rough. (Formal.)
رددت على الرسالتين بعد مراجعة المرفقات
radadtu ʿalā r-risālatayni baʿda murājaʿati l-murfaqāt
I replied to the two messages after reviewing the attachments. (Formal.)
مللت الانتظار، فخرجت لأشرب القهوة
maliltu l-intiẓāra, fakharajtu liʾashraba l-qahwa
I got tired of waiting, so I went out for coffee. (Neutral MSA.)
There is no completely reliable way to recover the hidden vowel from an unvocalized third-person citation form alone. A serious dictionary entry, a vocalized corpus, or a verified conjugation gives it. This arbitrariness deserves memorization rather than a fabricated rule.
Attached objects come after the complete subject form
A subject suffix is part of the finite verb; an object clitic then attaches outside it. مَدَدْتُهُ means “I extended it”: مَدَدْـ is the unfolded stem, ـتُ marks the subject, and ـهُ is the object. Do not let the object clitic erase the subject contrast.
مددته إلى نهاية الممر ثم ثبتناه في مكانه
madadtuhu ʾilā nihāyati l-mamarri thumma thabbatnāhu fī makānih
I extended it to the end of the corridor, and then we fixed it in place. (Formal.)
مدتهما الشركة بالخوادم اللازمة للعمل عن بعد
maddat-humā sh-sharikatu bil-khawādimi l-lāzimati lil-ʿamali ʿan buʿd
The company supplied the two of them with the servers needed for remote work. (Formal.)
In the second example, مَدَّتْ is the contracted feminine-singular subject form; ـهُمَا is the dual object. A following explicit subject الشركة explains the feminine verb.
Perfect aspect and agreement still operate normally
Gemination changes the stem, not the meaning of the perfect. The perfect presents the event as bounded or complete in its reference frame. It also follows ordinary agreement: subject-first clauses show full agreement, whereas a verb before an explicit human plural subject is normally singular in neutral formal VSO.
المهندسات مددن الشبكة قبل افتتاح المبنى
al-muhandisātu madadna sh-shabakata qabla ftitāḥi l-mabnā
The women engineers extended the network before the building opened. (Formal SVO; full feminine-plural agreement.)
مد المهندسون الشبكة قبل افتتاح المبنى
madda l-muhandisūna sh-shabakata qabla ftitāḥi l-mabnā
The engineers extended the network before the building opened. (Formal VSO; singular verb.)
Common Mistakes
Contracting before the first-person suffix
❌ مدت الموعد أسبوعا
Incorrect if the subject is ‘I’—مدّت means ‘she extended’; first singular is مددتُ.
✅ مددت الموعد أسبوعا بعد موافقة الفريق
madadtu l-mawʿida ʾusbūʿan baʿda muwāfaqati l-farīq
I extended the deadline by a week after the team approved.
Using the wrong unfolded vowel
❌ مللت الانتظار
malaltu l-intiẓār
Incorrect reading—the verified first singular of ملّ is مَلِلْتُ with i between the radicals.
✅ مللت الانتظار في الطابور الطويل
maliltu l-intiẓāra fī ṭ-ṭābūri ṭ-ṭawīl
I became bored waiting in the long queue.
Confusing feminine singular and feminine plural
❌ المهندسات مدت الشبكة
Incorrect in a subject-first clause—feminine-plural المهندسات requires مددنَ, not feminine-singular مدّت.
✅ المهندسات مددن الشبكة خلال يومين
al-muhandisātu madadna sh-shabakata khilāla yawmayn
The women engineers extended the network within two days.
Giving a verb-first clause full plural agreement
❌ مدوا العمال الأنابيب عبر الحقل
Incorrect in neutral formal VSO—use singular مدّ before the overt plural subject.
✅ مد العمال الأنابيب عبر الحقل
madda l-ʿummālu l-ʾanābība ʿabra l-ḥaql
The workers laid the pipes across the field.
Forgetting that an object clitic follows the subject ending
❌ مدته إلى الباب
Incorrect for ‘I extended it’—مدّته means ‘she extended it’; first singular is مددتهُ.
✅ مددته إلى الباب ثم فصلت التيار
madadtuhu ʾilā l-bābi thumma faṣaltu t-tayyār
I ran it to the door and then disconnected the power.
Key Takeaways
- Contract مَدّـ in مَدَّ، مَدَّتْ، مَدَّا، مَدَّتَا، مَدُّوا.
- Unfold to مَدَدْـ before ـتُ/ـتَ/ـتِ، ـتُمَا، ـتُمْ، ـتُنَّ، ـنَا and feminine-plural ـنَ.
- The hidden vowel is lexical: compare مَدَدْتُ with مَلِلْتُ.
- Subject endings come before object clitics: مَدَدْتُهُ “I extended it.”
- Geminate stems still follow ordinary perfect aspect and SVO–VSO agreement.
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