Common Broken-Plural Patterns | Arabic (Modern Standard) Grammar

Broken plurals are not random collections of vowels. They cluster in recognizable templates, and five especially useful shapes are أَفْعَال ʾafʿāl, فُعُول fuʿūl, فِعَال fiʿāl, فُعَلَاء fuʿalāʾ, and مَفَاعِل mafāʿil. Recognizing a pattern makes reading and memory easier.

Recognition is not prediction. A singular noun selects its plural lexically, and two similar singulars can choose different patterns. Learn the attested pair first; use the pattern to organize what you know. The conceptual foundation is on Broken Plurals: A Working Overview.

Pattern map

The letters ف، ع، ل stand for root consonants. Extra letters and vowels in the template describe how a root is arranged, not a suffix that can be attached freely.

Pattern	Representative pairs	Typical case class
أَفْعَال ʾafʿāl	قَلَم/أَقْلَام، سَبَب/أَسْبَاب، طِفْل/أَطْفَال	usually triptote
فُعُول fuʿūl	بَيْت/بُيُوت، دَرْس/دُرُوس، قَلْب/قُلُوب	usually triptote
فِعَال fiʿāl	رَجُل/رِجَال، جَبَل/جِبَال، كَلْب/كِلَاب	usually triptote
فُعَلَاء fuʿalāʾ	زَمِيل/زُمَلَاء، فَقِير/فُقَرَاء، وَزِير/وُزَرَاء	diptote
مَفَاعِل mafāʿil	مَسْجِد/مَسَاجِد، مَكْتَب/مَكَاتِب، مَدْرَسَة/مَدَارِس	diptote

“Usually” matters. Lexical exceptions exist, and definiteness changes diptote genitive behavior. A pattern label is not a replacement for the full dictionary entry.

أفعال: a prefixed pattern

Pattern أَفْعَال adds initial hamzat al-qaṭʿ and often contains long ā before the final root consonant. It is common with many short concrete nouns, but that is a tendency rather than a semantic rule.

قلم، قلمان، أقلام.

qalam, qalamān, ʾaqlām.

A pen, two pens, pens.

سبب، أسباب؛ طفل، أطفال.

sabab, ʾasbāb; ṭifl, ʾaṭfāl.

A reason, reasons; a child, children.

Initial أ is a pronounced hamza, so أقلام begins ʾa-, not just a-. The plural is normally triptote:

هذه أقلام جديدة.

hādhihi ʾaqlāmun jadīda.

These are new pens. (Nominative -un connected.)

The pens are nonhuman, so demonstrative هذه and adjective جديدة are feminine singular despite the plural pattern.

فعول: internal expansion with long ū

Pattern فُعُول commonly inserts a syllable and long ū. Preserve that vowel length: بُيُوت buyūt, not buyut.

بيت، بيوت؛ درس، دروس.

bayt, buyūt; dars, durūs.

A house, houses; a lesson, lessons.

البيوت القديمة واسعة.

al-buyūtu l-qadīmatu wāsiʿa.

The old houses are spacious.

Again, nonhuman plural البيوت takes feminine singular adjectives. The lexical plural shape and the agreement shape do different jobs.

فعال: a long-ā pattern

Pattern فِعَال has initial i and long ā. It includes human nouns such as رجال and nonhuman nouns such as جبال and كلاب; the pattern does not decide agreement.

رجل، رجال؛ جبل، جبال.

rajul, rijāl; jabal, jibāl.

A man, men; a mountain, mountains.

وصل رجال جدد.

waṣala rijālun judud.

New men arrived.

The human plural takes masculine plural adjective جدد. Because the verb precedes its explicit plural subject, neutral formal MSA uses singular وصل.

الجبال العالية مغطاة بالثلج.

al-jibālu l-ʿāliyatu mughaṭṭātun bith-thalj.

The high mountains are covered with snow.

Both العالية and مغطاة are feminine singular because mountains are nonhuman.

فعلاء: human descriptors and diptote case

Pattern فُعَلَاء frequently pluralizes human adjectives, roles, and relationship nouns. It ends in اء -āʾ, with a pronounced final hamza. It is diptote: no tanwīn, and an indefinite genitive uses -a rather than -i.

زميل، زملاء؛ فقير، فقراء.

zamīl, zumalāʾ; faqīr, fuqarāʾ.

A colleague, colleagues; a poor person, poor people.

ساعدت زملاء جددا.

sāʿadtu zumalāʾa jududā.

I helped new colleagues.

Plural زملاءَ is diptote accusative without tanwīn. Human agreeing adjective جددًا is a triptote broken plural; at final pause it is pronounced jududā.

تحدثت مع زملاء جدد.

taḥaddathtu maʿa zumalāʾa judud.

I spoke with new colleagues. (Indefinite diptote genitive -a.)

When definite, genitive -i returns:

تحدثت مع الزملاء الجدد.

taḥaddathtu maʿa z-zumalāʾi l-judud.

I spoke with the new colleagues.

The adjective is grammatically genitive plural too, but final pause masks its short ending.

مفاعل: places, institutions, and diptote case

Pattern مَفَاعِل is frequent in plurals of place and instrument nouns beginning with م, though not every such noun selects it. It is a classic diptote pattern.

مسجد، مساجد؛ مكتب، مكاتب؛ مدرسة، مدارس.

masjid, masājid; maktab, makātib; madrasa, madāris.

A mosque, mosques; an office, offices; a school, schools.

زرت مساجد تاريخية.

zurtu masājida tārīkhiyya.

I visited historic mosques. (Diptote accusative -a.)

صليت في مساجد تاريخية.

ṣallaytu fī masājida tārīkhiyya.

I prayed in historic mosques. (Indefinite diptote genitive -a.)

صليت في المساجد التاريخية.

ṣallaytu fī l-masājidi t-tārīkhiyya.

I prayed in the historic mosques. (Definite genitive -i.)

Pattern does not equal one meaning

The same pattern can hold people, animals, objects, and abstractions. Conversely, related meanings may use different patterns. كاتب kātib “writer” commonly has كتّاب kuttāb, while كتاب kitāb “book” has كتب kutub. Root overlap does not make their plural forms interchangeable.

Some nouns have more than one accepted plural. شهر shahr has أشهر ʾashhur and شهور shuhūr in contemporary MSA, with preferences shaped by construction, frequency, and style. There is no responsible one-line rule that replaces observing actual usage.

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Say the pair aloud with its long vowels and hamza: bayt–buyūt, qalam–ʾaqlām, zamīl–zumalāʾ. The pattern becomes a pronounceable rhythm rather than an abstract label.

Case summary across the five patterns

Patterns	Indefinite nominative	Indefinite accusative	Indefinite genitive
أفعال، فعول، فعال	-un	-an	-in
فعلاء، مفاعل	-u, no tanwīn	-a, no tanwīn	-a, no tanwīn

Diptotes with الـ, and diptotes used as the construct head of an iḍāfa, use genitive -i. Merely being the dependent term does not itself trigger that restoration. This is why the pattern must be learned together with case class rather than as a vowel melody alone.

Contemporary informational use

تعمل مكاتب الوزارة في مدن مختلفة.

taʿmalu makātibu l-wizārati fī mudunin mukhtalifa.

The ministry's offices operate in different cities.

مكاتب follows مفاعل and is nominative diptote, but it is definite through iḍāfa and takes no tanwīn. مدن is a different, triptote broken pattern and takes genitive -in. Both nonhuman plurals trigger feminine singular agreement: تعمل and مختلفة.

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For each plural, store four facts when relevant: singular pair, vocalized template, triptote or diptote case, and human or nonhuman agreement. Pattern recognition supplies only the second fact.

Common Mistakes

Creating a sound plural when the noun has a broken one

❌ قلمون

Incorrect — the ordinary plural of قلم is أقلام.

✅ أقلام.

ʾaqlām.

Pens.

❌ الكتب يعملون في الصحيفة

Incorrect for ‘the writers work at the newspaper’ — كتب means books.

✅ الكتاب يعملون في الصحيفة.

al-kuttābu yaʿmalūna fī ṣ-ṣaḥīfa.

The writers work at the newspaper.

Treating a diptote pattern as triptote

❌ صليت في مساجد

Incorrect full reading if مساجد is pronounced masājidin; indefinite مفاعل takes genitive -a without tanwīn.

✅ صليت في مساجد.

ṣallaytu fī masājida.

I prayed in mosques. (Correct diptote genitive.)

Using plural agreement with a nonhuman pattern

❌ البيوت القديمون واسعون

Incorrect — nonhuman بيوت takes feminine singular agreement.

✅ البيوت القديمة واسعة.

al-buyūtu l-qadīmatu wāsiʿa.

The old houses are spacious.

Adding a numeral to a plural for exactly two

❌ اثنان أقلام

Incorrect for neutral ‘two pens’ — use the dual noun.

✅ قلمان.

qalamān.

Two pens.

Key Takeaways

Recognize أفعال، فعول، فعال، فعلاء، مفاعل, but verify each noun's actual plural.
أفعال، فعول، فعال are generally triptote; فعلاء and مفاعل are diptote.
Pattern does not determine gender, humanness, or agreement.
Learn the singular–plural pair, vocalized rhythm, case class, and agreement behavior together.

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