Egyptian Arabic uses the suffix ـين -īn to form the regular plural of many masculine nouns referring to people, especially professions, nationalities, and roles. Thus موظف “employee” becomes موظفين “employees,” and مهندس “engineer” becomes مهندسين “engineers.” The spelling resembles one part of the formal MSA case system, but everyday Egyptian has one invariant plural ending: -īn.
The suffix is productive, not universal. Many extremely common masculine human nouns instead have lexical broken plurals, so the plural still needs to be learned with the singular. Unless marked otherwise, the examples represent mainstream Cairene (informal) usage.
The Core Pattern
Attach ـين directly to a suitable masculine singular stem. In mainstream Cairene speech, its vowel is long ī.
| Singular | Meaning | Plural | Romanization |
|---|---|---|---|
| موظف | employee | موظفين | muwaẓẓafīn |
| مهندس | engineer | مهندسين | muhandisīn |
| مدرس | teacher | مدرسين | mudarrisīn |
| مصري | Egyptian | مصريين | maṣriyyīn |
| مسؤول | official; person responsible | مسؤولين | masʾūlīn |
With a stem ending in ي, as in مصري, the spelling has يين and the pronunciation has a long or doubled y-like transition: maṣriyyīn. This is ordinary (informal) Egyptian morphology, not an added word.
الموظفين وصلوا بدري النهارده.
il-muwaẓẓafīn wiṣlu badri innaharda.
The employees arrived early today.
إحنا محتاجين مهندسين عندهم خبرة.
iḥna muḥtāgīn muhandisīn ʿanduhum khibra.
We need engineers who have experience.
في مدرسين جداد في المدرسة.
fī mudarrisīn gudād fil-madrasa.
There are new teachers at the school.
Human Plural Agreement
Because these nouns normally refer to people, they take human plural agreement in mainstream Egyptian: دول “these/those,” a plural adjective where one exists, and a plural verb or pronoun.
المهندسين الجداد شافوا المكان.
il-muhandisīn il-gudād shāfu il-makān.
The new engineers saw the place.
دول مسؤولين عن المشروع كله.
dōl masʾūlīn ʿan il-mashrūʿ kullu.
These people are responsible for the whole project.
This agreement contrasts with the common feminine-singular agreement pattern used for many nonhuman plurals.
الموظفين الجداد وصلوا، والكتب الجديدة وصلت بعدهم.
il-muwaẓẓafīn il-gudād wiṣlu, wil-kotob il-gidīda wiṣlit baʿduhum.
The new employees arrived, and the new books arrived after them.
The human noun has plural الجداد وصلوا. The nonhuman plural has feminine singular الجديدة وصلت in this careful mainstream pattern. Actual Egyptian nonhuman agreement is more variable than the strict classroom rule inherited from MSA, especially when objects are salient or personified; see human and nonhuman plurals.
Which Nouns Do Not Take -ين?
There is no completely reliable meaning-based test. Profession and nationality nouns often take ـين, but several high-frequency human nouns have inherited broken plurals.
| Singular | Actual plural | Not the usual plural |
|---|---|---|
| ولد “boy” | ولاد | ولدين |
| راجل “man” | رجالة | راجلين |
| دكتور “doctor” | دكاترة | دكتورين |
| صاحب “friend; owner” | صحاب | صاحبين |
The forms in the last column naturally mean “two boys,” “two men,” “two doctors,” and “two friends/owners” when pronounced with dual -ēn; they are not the ordinary plurals. This is genuinely lexical, so memorization is unavoidable.
الدكاترة مستنيين نتيجة التحليل.
id-dakatra mistanniyyīn natīgit it-taḥlīl.
The doctors are waiting for the test result.
صحابي المصريين جايين بكرة.
ṣoḥābi il-maṣriyyīn gayyīn bukra.
My Egyptian friends are coming tomorrow.
In the second example, the noun صحاب is broken, while the nationality adjective مصريين and participle جايين use ـين. A single noun phrase can therefore contain more than one plural strategy.
Plural -īn versus Dual -ēn
Unvocalized Arabic writes both the sound masculine plural suffix and the Egyptian dual suffix with ين. Cairene speech normally distinguishes them by vowel:
| Function | Form | Pronunciation | Example |
|---|---|---|---|
| sound masculine plural | موظفين | muwaẓẓafīn | employees |
| dual | موظفين | muwaẓẓafēn | two employees |
| dual of a noun with a broken plural | كتابين | kitabēn | two books |
Context, a number, and the vowel in speech resolve the ambiguity.
الموظفين كلهم حضروا الاجتماع.
il-muwaẓẓafīn kulluhum ḥaḍaru il-igtimāʿ.
All the employees attended the meeting.
موظفين بس حضروا الاجتماع.
muwaẓẓafēn bass ḥaḍaru il-igtimāʿ.
Only two employees attended the meeting.
Egyptian -īn and Formal MSA Endings
Formal MSA distinguishes nominative ـونَ -ūna from accusative/genitive ـينَ -īna. That case alternation is (formal) and belongs to MSA, not ordinary Egyptian conversation. Egyptian keeps ـين -īn whether the noun is a subject, an object, or follows a preposition.
المحاسبين راجعوا الأرقام.
il-muḥāsibīn rāgaʿu il-arʾām.
The accountants reviewed the figures.
كلمت المحاسبين بعد الاجتماع.
kallimt il-muḥāsibīn baʿd il-igtimāʿ.
I spoke to the accountants after the meeting.
اتفقنا مع المحاسبين على ميعاد جديد.
ittafaʾna maʿ il-muḥāsibīn ʿala mīʿād gidīd.
We agreed on a new time with the accountants.
The ending is unchanged in all three grammatical positions. Code-switching into MSA can be appropriate in a speech, news report, or official reading, but alternating -ūn/-īn inside otherwise colloquial Cairene is not the everyday Egyptian system.
A Short Noun-Phrase Exchange
مين مستني بره؟
mīn mistanni barra?
Who's waiting outside?
الموظفين الجداد؛ المدير جوه.
il-muwaẓẓafīn il-gudād; il-mudīr guwwa.
The new employees; the manager is inside.
The reply uses a plural noun plus a plural adjective, while singular المدير remains morphologically separate.
Common Mistakes
1. Using -ين as a universal English-style plural
❌ حطيت الكتابين على الرف.
Incorrect for the intended meaning 'I put the books on the shelf' — كتابين means two books.
✅ حطيت الكتب على الرف.
ḥaṭṭēt il-kotob ʿala ir-raff.
I put the books on the shelf.
2. Writing the suffix as a separate word
❌ الموظف ين وصلوا.
Incorrect — the plural suffix attaches directly to the noun.
✅ الموظفين وصلوا.
il-muwaẓẓafīn wiṣlu.
The employees arrived.
3. Leaving the surrounding words singular
❌ دول موظف جديد.
Incorrect — the noun and adjective must be plural after دول.
✅ دول موظفين جداد.
dōl muwaẓẓafīn gudād.
These are new employees.
4. Adding the masculine suffix to a feminine human noun
❌ الموظفةين مستنيين.
Incorrect — the regular feminine human plural uses -ات.
✅ الموظفات مستنيين.
il-muwaẓẓafāt mistanniyyīn.
The female employees are waiting.
5. Mixing an MSA nominative form into Egyptian syntax
❌ قابلت الموظفون امبارح.
Incorrect hybrid — Egyptian uses invariant الموظفين, and formal MSA would also require the accusative form here.
✅ قابلت الموظفين امبارح.
ʾābilt il-muwaẓẓafīn imbāriḥ.
I met the employees yesterday.
Key Takeaways
- ـين -īn regularly pluralizes many masculine human nouns, especially professions and nationalities.
- It is selective: ولاد، رجالة، دكاترة، صحاب are common broken plurals that must be learned.
- Human plural nouns normally trigger plural demonstratives, adjectives, verbs, and pronouns.
- Written ين can represent plural -īn or dual -ēn; speech and context distinguish them.
- Egyptian -īn is invariant. Do not import the formal MSA -ūn/-īn case alternation into everyday Cairene.
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- Sound Feminine Plural ـاتA2 — Form and use Egyptian Arabic plurals in ـات while recognizing the feminine nouns and nonhuman nouns that take other plural patterns.
- Broken Plurals: A Working OverviewA2 — Understand how Egyptian Arabic forms lexical plurals by reshaping noun stems and how those plurals control agreement.
- Human and Non-Human Plural NounsB1 — Choose plural or feminine-singular agreement with Egyptian plural nouns according to humanness, animacy, and discourse context.
- Adjectives with Human PluralsA2 — Use Egyptian plural adjective forms with male, female, and mixed human groups while keeping definiteness and predicate structure separate.
- Adding MSA Case Endings and TanwīnA2 — Remove productive MSA case vowels and tanwīn from ordinary Cairene speech while recognizing careful formal quotation and fixed lexical endings.