A doubly weak verb has two weak radicals—و or ي—in its root. That label identifies the root, not one universal conjugation. Form-I وَقَى / يَقِي “protect,” root و-ق-ي, loses its initial wāw in the imperfect and its final yāʾ in a singular jussive. Form-I رَوَى / يَرْوِي “narrate; water,” root ر-و-ي, has adjacent weak radicals but does not lose an initial consonant. The two verbs therefore require different principal-part chains.
English speakers often try to apply two familiar weak-verb rules one after the other. That can produce plausible-looking forms which do not exist. The dependable method is lexical: verify the perfect, imperfect, maṣdar, a suffixed perfect, and a governed imperfect. The traditional labels لفيف مفروق “separated doubly weak” and لفيف مقرون “joined doubly weak” then explain why the verified forms cluster as they do.
Two classes, not one doubled rule
The two weak radicals may be separated by a sound radical or adjacent to each other. The dedicated lafīf mafrūq guide and lafīf maqrūn guide develop their full paradigms:
| Class | Root arrangement | Verified example | Diagnostic forms |
|---|---|---|---|
| lafīf mafrūq “separated” | weak R1 + sound R2 + weak R3 | وَقَى / يَقِي / وِقَايَة | وَقَيْتُ، لَمْ يَقِ، قِ |
| lafīf maqrūn “joined” | two adjacent weak radicals, commonly R2 + R3 | رَوَى / يَرْوِي / رِوَايَة | رَوَيْتُ، لَمْ يَرْوِ، اِرْوِ |
The radicals belong to the lexical root even when neither appears plainly in a short surface form. قِ qi is a complete imperative of وقى, not an abbreviation; يروي contains the effects of both و and ي, not an ordinary sound stem plus an optional vowel.
Separated weakness: وقى / يقي
Form I وَقَى / يَقِي / وِقَايَة “protect,” root و-ق-ي, is separated doubly weak. The perfect begins with root wāw, but the active imperfect drops it: يَقِي, not يَوْقِي. At the other edge, final yāʾ appears as ى in citation perfect وقى, returns as consonantal ي before endings such as ـتُ in وَقَيْتُ, and disappears in singular jussive لَمْ يَقِ.
| Environment | Form | What the two weak radicals do |
|---|---|---|
| perfect, 3 m.sg. | وَقَى | initial و remains; final ي surfaces as ى |
| perfect, 1 sg. | وَقَيْتُ | initial و and final ي are both visible |
| imperfect indicative | يَقِي | initial و is absent; final ي carries long ī |
| imperfect subjunctive | لَنْ يَقِيَ | final ي remains and takes audible fatḥa |
| imperfect jussive | لَمْ يَقِ | initial و remains absent; final ي is deleted |
| imperative, 2 m.sg. | قِ | the jussive stem remains after the prefix is removed |
The usual contemporary frame is وقى شخصًا/شيئًا من شيء “protect someone/something from something.” The object is direct; من introduces the danger.
وقى النظام الجديد بيانات العملاء من الوصول غير المصرح به.
waqā n-niẓāmu l-jadīdu bayānāti l-ʿumalāʾi mina l-wuṣūli ghayri l-muṣarraḥi bih.
The new system protected customers’ data from unauthorized access. (Formal.)
هذه الطبقة تقي الجهاز من الرطوبة.
hādhihi ṭ-ṭabaqatu taqī l-jihāza mina r-ruṭūba.
This layer protects the device from moisture. (Formal technical register.)
لن يقي هذا الإجراء الموظفين من جميع المخاطر.
lan yaqiya hādhā l-ʾijrāʾu l-muwaẓẓafīna min jamīʿi l-makhāṭir.
This measure will not protect the employees from every risk. (Subjunctive after لن.)
لم يق الغطاء الشاشة من الكسر.
lam yaqi l-ghiṭāʾu sh-shāshata mina l-kasr.
The cover did not protect the screen from breaking. (Jussive after لم.)
The one-letter command قِ is grammatical but strongly (formal/literary). Contemporary instructions often prefer احمِ from حَمَى / يَحْمِي because it is easier to recognize. Register choice does not make قِ morphologically incomplete.
ق نفسك من الاحتيال، ولا ترسل كلمة المرور إلى أحد.
qi nafsaka mina l-iḥtiyāli, wa-lā tursil kalimata l-murūri ʾilā ʾaḥad.
Protect yourself from fraud, and do not send your password to anyone. (Formal/literary use of قِ.)
Joined weakness: روى / يروي
Form I رَوَى / يَرْوِي / رِوَايَة “narrate; transmit,” root ر-و-ي, is joined doubly weak: its second and third radicals are adjacent. Its perfect citation form ends in ى, its imperfect ends in ي, and a consonant-initial suffix gives رَوَيْتُ. The middle wāw helps shape the diphthong aw in رَوَيْتُ; it is not a consonant that can simply be inserted before every ending.
روت الصحفية ما شاهدته من دون مبالغة.
rawati ṣ-ṣaḥafiyyatu mā shāhadathu min dūni mubālagha.
The journalist recounted what she had seen without exaggeration. (Formal.)
روى الشهود تفاصيل متشابهة عن الحادث.
rawā sh-shuhūdu tafāṣīla mutashābihatan ʿani l-ḥādith.
The witnesses recounted similar details about the incident. (Neutral formal VSO; singular verb before the human plural.)
الباحثتان ترويان القصة من منظورين مختلفين.
al-bāḥithatāni tarwiyāni l-qiṣṣata min manẓūrayni mukhtalifayn.
The two researchers narrate the story from two different perspectives. (Full dual agreement after the subject.)
لن يروي المتحدث تفاصيل المفاوضات.
lan yarwiya l-mutaḥaddithu tafāṣīla l-mufāwaḍāt.
The spokesperson will not recount the details of the negotiations. (Subjunctive.)
لم يرو التقرير إلا الوقائع التي أمكن التحقق منها.
lam yarwi t-taqrīru ʾillā l-waqāʾiʿa llatī ʾamkana t-taḥaqququ minhā.
The report recounted only the facts that could be verified. (Jussive.)
The same spelling family can have another established sense: روى الزرع “water the crops.” Learn the complement and context with the meaning rather than assuming that every occurrence concerns storytelling.
يروي المزارعون الأشجار عند الفجر لتقليل تبخر الماء.
yarwī l-muzāriʿūna l-ʾashjāra ʿinda l-fajri litaqlīli tabakhkhuri l-māʾ.
The farmers water the trees at dawn to reduce water evaporation. (Formal.)
Agreement and mood are separate layers
A doubly weak stem still obeys ordinary agreement. With a preverbal dual or plural subject, full agreement appears: الباحثتان ترويان. In neutral VSO, a preceding verb is normally singular before an explicit human plural: روى الشهود. Nonhuman plurals normally take feminine-singular agreement: الطبقات تقي “the layers protect.”
The five verbs also preserve their own mood system. Indicative هم يروون becomes لن يرووا / لم يرووا by deletion of nūn, whereas feminine-plural هن يروين keeps nūn al-niswa. Do not apply the unsuffixed 3 m.sg. shape لم يروِ to plural cells that carry their own agreement ending.
Common Mistakes
Restoring initial wāw in the imperfect of وقى
❌ هذا الطلاء يوقي المعدن من الصدأ.
Incorrect—Form I وقى loses initial wāw in the active imperfect; the form is يقي.
✅ هذا الطلاء يقي المعدن من الصدأ.
hādhā ṭ-ṭilāʾu yaqī l-maʿdina mina ṣ-ṣadaʾ.
This coating protects the metal from rust.
Keeping final yāʾ in a singular jussive
❌ لم يقي القناع العامل من الغبار.
Incorrect in careful MSA—after لم, singular يقي loses final ي: لم يقِ.
✅ لم يق القناع العامل من الغبار الدقيق.
lam yaqi l-qināʿu l-ʿāmila mina l-ghubāri d-daqīq.
The mask did not protect the worker from fine dust.
Treating joined روى like separated وقى
❌ الصحفي يري القصة بوضوح.
Incorrect for ‘narrates’—روى / يروي retains the joined-stem sequence; يري belongs to other analyses.
✅ الصحفي يروي القصة بوضوح ومن دون تهويل.
aṣ-ṣaḥafiyyu yarwī l-qiṣṣata biwuḍūḥin wa-min dūni tahwīl.
The journalist tells the story clearly and without sensationalism.
Copying the English past into an Arabic imperfect context
❌ أمس يروي الشاهد ما حدث أمام اللجنة.
Incorrect in a completed past narrative—use perfect روى unless a historical-present effect is deliberately intended.
✅ أمس روى الشاهد ما حدث أمام اللجنة.
ʾamsi rawā sh-shāhidu mā ḥadatha ʾamāma l-lajna.
Yesterday the witness recounted what happened before the committee.
Giving a verb-first plural full agreement
❌ رووا الشهود تفاصيل متطابقة.
Incorrect in neutral formal VSO—before the explicit human plural subject, use singular روى.
✅ روى الشهود تفاصيل متطابقة عن زمن الحادث.
rawā sh-shuhūdu tafāṣīla mutaṭābiqatan ʿan zamani l-ḥādith.
The witnesses recounted matching details about the time of the incident.
Key Takeaways
- “Doubly weak” identifies two و/ي radicals; it does not supply one conjugation rule.
- Separated و-ق-ي loses initial wāw in the active imperfect and final yāʾ in the singular jussive.
- Joined ر-و-ي has the verified chain روى / يروي / رويت / لم يروِ.
- Mood governors, agreement, complement frames, and register remain independent grammatical decisions.
- Memorize verified principal-part chains before generalizing across doubly weak roots.
Now practice Arabic
Reading grammar gets you part of the way. The exercises are where it sticks — free, no signup needed.
Start learning Arabic →Related Topics
- Form X Weak VerbsB1 — Conjugate final-weak, hollow, and initial-wāw Form X verbs through verified families such as استدعى، استقام، استطاع، and استوعب.
- Lafīf Mafrūq VerbsB1 — Conjugate separated doubly weak roots such as و-ق-ي and و-ف-ي across the perfect, imperfect, moods, and very short imperatives.
- Lafīf Maqrūn VerbsB1 — Conjugate joined doubly weak roots such as ر-و-ي and ط-و-ي through their suffix-driven perfect and mood alternations.
- Imperatives of Weak VerbsA2 — Derive weak-verb commands from the second-person jussive, preserving radical loss, helping vowels, and addressee suffixes.
- The Arabic Verb SystemA1 — See how Arabic verb stems, agreement, mood, voice, and derived Forms work together in complete sentences.