Lafīf Mafrūq Verbs | Arabic (Modern Standard) Grammar

A lafīf mafrūq verb (لفيف مفروق, “separated doubly weak”) has a weak first radical and a weak third radical, with a sound consonant between them. Form-I وَقَى / يَقِي “protect,” root و-ق-ي, and وَفَى / يَفِي “fulfill; suffice,” root و-ف-ي, are the core models. Their weak radicals are separated in the root, but both can disappear from a short surface form: لَمْ يَقِ and imperative قِ.

This is where mechanical root substitution fails badly. The initial wāw behaves like that of an assimilated verb: it is present in the perfect but absent from the active imperfect. The final yāʾ behaves like that of a final-weak verb: it changes under suffixation and disappears in the singular jussive. You must nevertheless verify each verb’s imperfect vowel, maṣdar, meaning, and complement frame. The doubly weak overview places this class beside the joined type.

The diagnostic chain

The smallest useful paradigm puts each weak radical in an environment where its behavior becomes visible:

Environment	و-ق-ي “protect”	و-ف-ي “fulfill; suffice”
perfect, 3 m.sg.	وَقَى	وَفَى
imperfect indicative	يَقِي	يَفِي
maṣdar	وِقَايَة	وَفَاء
perfect, 1 sg.	وَقَيْتُ	وَفَيْتُ
jussive, 3 m.sg.	لَمْ يَقِ	لَمْ يَفِ
imperative, 2 m.sg.	قِ	فِ

The first-radical و is not “gone from the verb.” It appears in وقى، وفيت، وقاية، وفاء but is absent from the active imperfect stems قي-، في-. The final ي appears plainly in وقيت، وفيت, carries long ī in يقي، يفي, and is deleted from singular jussive يقِ، يفِ.

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Use the chain وقى — يقي — وقيت — لم يقِ — قِ as a map of environments, not as a formula into which any root may be inserted. The parallel chain for وفى must still be learned with its own meanings and complements.

The perfect keeps initial wāw

In the perfect, initial wāw remains throughout. Final yāʾ appears as ى in the citation form, as ي before consonant-initial suffixes, disappears before feminine-singular ـتْ, and is reshaped before masculine-plural ـوا.

Subject	وقى	وفى
هو	وَقَى	وَفَى
هي	وَقَتْ	وَفَتْ
هما (m.)	وَقَيَا	وَفَيَا
هم	وَقَوْا	وَفَوْا
هنّ	وَقَيْنَ	وَفَيْنَ
أنا	وَقَيْتُ	وَفَيْتُ
نحن	وَقَيْنَا	وَفَيْنَا

Form I وقى normally takes a direct object for the protected person or thing and من for the danger: وقى الشيءَ من الضرر. This valency is independent of its morphology.

وقى العازل الأسلاك من الرطوبة طوال الشتاء.

waqā l-ʿāzilu l-ʾaslāka mina r-ruṭūbati ṭuwāla sh-shitāʾ.

The insulation protected the wires from moisture throughout the winter. (Formal.)

وقت المظلة الزائرين من أشعة الشمس المباشرة.

waqati l-miẓallatu z-zāʾirīna min ʾashiʿʿati sh-shamsi l-mubāshira.

The canopy protected the visitors from direct sunlight. (Feminine-singular perfect.)

وقيت هاتفي من الماء بغطاء محكم.

waqaytu hātifī mina l-māʾi bighiṭāʾin muḥkam.

I protected my phone from water with a tightly sealed case.

Form I وفى is especially (formal). With بـ, it means “fulfill, honor”: وفى بوعده / بعهده / بالتزامه. It can also mean “be sufficient for,” commonly in the negative expression لا يفي بالغرض “does not meet the need.” Form IV أوفى is also common, but it is a different derived form; do not silently mix its stem into this paradigm.

وفت الشركة بجميع التزاماتها قبل نهاية العقد.

wafati sh-sharikatu bijamīʿi ltizāmātihā qabla nihāyati l-ʿaqd.

The company fulfilled all its obligations before the contract ended. (Formal.)

المقاولتان وفتا بوعدهما وسلمتا المشروع في موعده.

al-muqāwilatāni wafatā biwaʿdihimā wa-sallamatā l-mashrūʿa fī mawʿidih.

The two contractors kept their promise and delivered the project on time. (Both female; full dual agreement.)

The active imperfect loses initial wāw

The active imperfects are يَقِي and يَفِي, not يوقي and يوفي. Person prefixes attach to the shortened stems: أَقِي، نَقِي، تَقِينَ and أَفِي، نَفِي، تَفِينَ. The spelling can be extremely short, but person and gender endings remain real.

هذه السترة تقي راكب الدراجة من الرياح الباردة.

hādhihi s-sutratu taqī rākiba d-darrājati mina r-riyāḥi l-bārida.

This jacket protects the cyclist from the cold wind.

الشركتان تفيان بالمعايير البيئية الجديدة.

ash-sharikatāni tafiyāni bil-maʿāyīri l-bīʾiyyati l-jadīda.

The two companies meet the new environmental standards. (Dual indicative.)

هذه البطاريات لا تفي بحاجة المختبر اليومية.

hādhihi l-baṭṭāriyyātu lā tafī biḥājati l-mukhtabari l-yawmiyya.

These batteries do not meet the laboratory’s daily needs. (Nonhuman plural with feminine-singular agreement.)

Ordinary negative لا does not govern the jussive here; لا تفي remains indicative. Subjunctive لن يفيَ retains final yāʾ and pronounces fatḥa, while jussive لم يفِ deletes yāʾ.

Mood can remove the second weak radical from sight

The singular mood contrast follows the final-yāʾ pattern:

Mood	وقى / يقي	وفى / يفي
indicative	يَقِي	يَفِي
subjunctive after لن	لَنْ يَقِيَ	لَنْ يَفِيَ
jussive after لم	لَمْ يَقِ	لَمْ يَفِ

لن تقي القواعد وحدها المؤسسة من الأخطاء البشرية.

lan taqiya l-qawāʿidu waḥdahā l-muʾassasata mina l-ʾakhṭāʾi l-bashariyya.

Rules alone will not protect the organization from human error. (Subjunctive; nonhuman plural subject.)

لم يف المبلغ بتكاليف الإصلاح كاملة.

lam yafi l-mablaghu bitakālīfi l-ʾiṣlāḥi kāmila.

The amount did not cover the repair costs in full. (Jussive.)

In the five verbs, the agreement suffix controls the visible mood contrast. Indicative هما يقيان becomes لن يقيا / لم يقيا through nūn deletion; masculine-plural هم يقون becomes لن يقوا / لم يقوا. Feminine-plural هن يقين keeps nūn al-niswa in every mood.

المهندسات يقين الشبكة من الانقطاع بإضافة مصدر احتياطي.

al-muhandisātu yaqīna sh-shabakata mina l-inqiṭāʿi biʾiḍāfati maṣdarin iḥtiyāṭiyy.

The female engineers protect the network from outages by adding a backup source. (Feminine plural.)

Very short imperatives are complete forms

Second-person jussive تَقِ loses تـ to produce قِ; تَفِ similarly produces فِ. No hamzat al-waṣl is added because the surviving consonant already bears a vowel. Both are valid, but their one-letter shape is most at home in (formal/literary) language. Contemporary prose often chooses احمِ “protect!” or أوفِ “fulfill!” for immediate clarity.

ف بوعدك حتى إن تغيرت الظروف.

fi biwaʿdika ḥattā ʾin taghayyarati ẓ-ẓurūf.

Keep your promise even if circumstances change. (Formal/literary.)

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A one-letter imperative is not permission to delete letters freely. It is the regular outcome of one verified chain: active imperfect loss of initial wāw, jussive loss of final yāʾ, then removal of the second-person prefix.

Common Mistakes

Restoring initial wāw in the active imperfect

❌ الغطاء يوقي الجهاز من الغبار.

Incorrect for Form I وقى—the active imperfect is يقي, without root-initial و.

✅ الغطاء يقي الجهاز من الغبار والرطوبة.

al-ghiṭāʾu yaqī l-jihāza mina l-ghubāri war-ruṭūba.

The cover protects the device from dust and moisture.

Deleting initial wāw from the perfect

❌ قيت الملفات من الحذف بنسخة احتياطية.

Incorrect—initial و remains in the perfect; ‘I protected’ is وقيتُ.

✅ وقيت الملفات من الحذف بنسخة احتياطية.

waqaytu l-malafāti mina l-ḥadhfi binuskhatin iḥtiyāṭiyya.

I protected the files from deletion with a backup copy.

Keeping final yāʾ after لم

❌ لم يفي العرض بالغرض.

Incorrect in careful MSA—لم governs the jussive, so singular يفي loses final ي.

✅ لم يف العرض بالغرض المطلوب.

lam yafi l-ʿarḍu bil-gharaḍi l-maṭlūb.

The proposal did not serve the required purpose.

Deleting final yāʾ after لن

❌ لن يف المبلغ بكل النفقات.

Incorrect—the subjunctive retains final ي and adds audible fatḥa: لن يفيَ.

✅ لن يفي المبلغ بكل النفقات المتوقعة.

lan yafiya l-mablaghu bikulli n-nafaqāti l-mutawaqqaʿa.

The amount will not cover all expected expenses.

Losing dual agreement after a preverbal subject

❌ الشركتان تفي بالتزاماتهما.

Incorrect—after a preverbal dual subject, the indicative must show dual agreement: تفيان.

✅ الشركتان تفيان بالتزاماتهما في الموعد المحدد.

ash-sharikatāni tafiyāni bil-tizāmātihimā fī l-mawʿidi l-muḥaddad.

The two companies meet their obligations by the specified deadline.

Key Takeaways

Lafīf mafrūq roots have weak R1 and R3 separated by a sound middle radical.
Perfect وقى / وفى keeps initial wāw; active imperfect يقي / يفي drops it.
Suffixed perfect وقيت / وفيت reveals final yāʾ, while singular jussive يقِ / يفِ deletes it.
قِ and فِ are complete formal/literary imperatives, not abbreviations.
Verify the lexical complement: وقى ... من ... but وفى بـ....

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