لا النافية للجنس makes a categorical claim: no member of the class named after لا exists, applies, or has the stated property. In لا خطأَ في الحساب “there is no error in the calculation,” the speaker excludes the whole indefinite class “error,” not one previously identified error.
This is a nominal-clause architecture. It has no tense of its own and governs no verb mood. Its noun belongs to the accusative domain; its predicate follows the ordinary syntax of its form. English places no inside a noun phrase, but Arabic builds a negative predication: roughly “no X exists/is Y.” The construction is particularly frequent in formal argument, institutional language, maxims, and fixed expressions (formal).
From an affirmative existential claim to categorical negation
Compare a positive existential sentence with its categorical negative counterpart:
يوجد بديل عملي لهذه الخطة.
yūjadu badīlun ʿamaliyyun li-hādhihi l-khuṭṭa(h).
There is a practical alternative to this plan.
لا بديل عملي لهذه الخطة.
lā badīla ʿamaliyyun li-hādhihi l-khuṭṭa(h).
There is no practical alternative to this plan. (Categorical: no alternative qualifies.)
In the negative sentence, simple indefinite بديلَ is the noun of لا and is built on fatḥ without tanwīn. عمليٌّ is a one-word predicate and therefore nominative. This split—accusative-domain noun, nominative predicate—resembles إنّ, although the categorical noun has special forms of its own.
Common compact formulas include لا شكَّ “there is no doubt,” لا مانعَ “there is no objection,” لا مفرَّ “there is no escape,” and لا بأسَ “there is no harm/problem.” They are productive grammar, not unanalyzable translations of English idioms.
لا شك في أن البيانات تحتاج إلى مراجعة.
lā shakka fī ʾanna l-bayānāti taḥtāju ʾilā murājaʿa(h).
There is no doubt that the data need reviewing. (Formal.)
Three forms of the noun after لا
The form depends on whether the noun is simple, annexed, or completed by dependent material. This classification is genuinely difficult: it is syntactic, not merely a question of how many written words follow لا.
| Noun type | Form | Example |
|---|---|---|
| simple: neither annexed nor completed | built on its accusative marker; no tanwīn | لَا تَأْخِيرَ |
| annexed, مضاف | inflected accusative; no tanwīn | لَا طَالِبَ عِلْمٍ |
| شبه المضاف | inflected accusative, normally with tanwīn | لَا رَاغِبًا فِي التَّأْجِيلِ |
A simple singular is built on fatḥ. A simple dual or sound masculine plural is built on yāʾ, and a simple sound feminine plural is built on kasra, because those are the corresponding accusative markers.
لا موظفين غائبون عن جلسة اليوم.
lā muwaẓẓafīna ghāʾibūna ʿan jalsati l-yawm.
No employees are absent from today's session. (The simple plural noun is built on yāʾ; its predicate is nominative.)
An annexed noun is accusative, while its annex complement is genitive. Annexation itself removes tanwīn:
لا صاحب خبرة يستخف بهذه المخاطر.
lā ṣāḥiba khibratin yastakhiffu bi-hādhihi l-makhāṭir.
No experienced person takes these risks lightly. (Formal.)
Here صاحبَ خبرةٍ is the noun phrase governed by لا; the verbal sentence يستخف... is its predicate. By contrast, a participle completed by its own object or prepositional complement is شبه المضاف and normally carries explicit accusative tanwīn:
لا مهملا واجبه جدير بالترقية.
lā muhmilan wājibahu jadīrun bi-t-tarqiya(h).
No one who neglects his duty deserves promotion. (Formal.)
The predicate can be a word, phrase, or clause
A single inflected predicate is nominative, as in عمليٌّ above. A prepositional phrase or adverbial can serve as the predicate without receiving nominal accusative from لا:
لا أحد في المختبر بعد الثامنة.
lā ʾaḥada fī l-mukhtabari baʿda th-thāmina(h).
There is nobody in the laboratory after eight.
A verbal clause can also be the predicate. Categorical لا does not govern that verb's mood. The final-weak indicative يسعى therefore retains ى:
لا عضو في الفريق يسعى إلى تعطيل المشروع.
lā ʿuḍwa fī l-farīqi yasʿā ʾilā taʿṭīli l-mashrūʿ.
No member of the team is seeking to obstruct the project.
Compare a true mood governor. لم selects the jussive and deletes that weak letter: لم يسعَ. The spelling contrast proves that the first لا governs a noun, not the later verb.
Scope: “none” is stronger than “not all”
Categorical لا places the whole class under negation. It must not be used when the intended claim is merely that a universal statement has exceptions:
لا خبير يوافق على هذا الاستنتاج.
lā khabīra yuwāfiqu ʿalā hādhā l-istintāj.
No expert agrees with this conclusion. (None at all.)
ليس كل خبير يوافق على هذا الاستنتاج.
laysa kullu khabīrin yuwāfiqu ʿalā hādhā l-istintāj.
Not every expert agrees with this conclusion. (Some may agree.)
The first claim excludes every expert; the second denies only total agreement. English learners often blur no expert and not every expert, but the difference is logically decisive. See Negation Scope with Quantifiers and Coordination for the wider system.
Repeating لا gives each coordinated class its own categorical domain:
لا تأخير في بدء المشروع ولا زيادة في الميزانية.
lā taʾkhīra fī badʾi l-mashrūʿi wa-lā ziyādata fī l-mīzāniyya(h).
There will be neither a delay in starting the project nor an increase in the budget. (Formal assurance.)
Time and answers come from the larger clause
Because categorical لا has no tense, context or an overt verb locates the claim in time. كان can place the construction in the past: لم يكن هناك أي اعتراض is often clearer than forcing a bare categorical formula to carry past time.
In a negative question, careful MSA uses بلى to overturn the negative proposition and نعم to confirm it:
أليس هناك أي حل لهذه المشكلة؟ بلى، هناك حل مؤقت.
ʾa-laysa hunāka ʾayyu ḥallin li-hādhihi l-mushkila(h)? balā, hunāka ḥallun muʾaqqat.
Isn't there any solution to this problem? Yes—there is a temporary solution.
أليس هناك أي اعتراض؟ نعم، لا اعتراض على الصيغة النهائية.
ʾa-laysa hunāka ʾayyu ʿtirāḍ? naʿam, lā ʿtirāḍa ʿalā ṣ-ṣīghati n-nihāʾiyya(h).
Isn't there any objection? That's right—there is no objection to the final wording.
Common Mistakes
Making a simple noun nominative or adding tanwīn
❌ لا بديل عملي لهذه الخطة.
lā badīlun ʿamaliyyun
Incorrect reading—the simple noun of categorical lā is built on fatḥ without tanwīn: badīla.
✅ لا بديل عملي لهذه الخطة.
lā badīla ʿamaliyyun li-hādhihi l-khuṭṭa(h).
There is no practical alternative to this plan.
Using categorical لا before a definite noun
❌ لا المدير موجود في مكتبه.
Incorrect—categorical lā denies an indefinite class, not one definite director.
✅ ليس المدير موجودا في مكتبه.
laysa l-mudīru mawjūdan fī maktabihi.
The director is not in his office.
Using ما with an imperfect as the neutral present pattern
❌ ما يسعى الفريق إلى التأجيل.
Incorrect as the neutral formal present negative—use lā plus the indicative imperfect.
✅ لا يسعى الفريق إلى التأجيل.
lā yasʿā l-farīqu ʾilā t-taʾjīl.
The team is not seeking a postponement.
Ignoring the jussive after لم
❌ لم يدعو الخبير إلى إلغاء المشروع.
Incorrect—lam requires the jussive, so final-weak yadʿū loses its final weak letter.
✅ لم يدع الخبير إلى إلغاء المشروع.
lam yadʿu l-khabīru ʾilā ʾilghāʾi l-mashrūʿ.
The expert did not call for cancelling the project.
Stretching one negator across every tense or answering by English habit
❌ ألا يوجد بديل أمس؟ نعم، وجد.
Incorrect—the present architecture clashes with yesterday, and naʿam would confirm rather than reverse the negative proposition.
✅ ألم يوجد بديل أمس؟ بلى، وجد بديل مؤقت.
ʾa-lam yūjad badīlun ʾams? balā, wujida badīlun muʾaqqat.
Wasn't there an alternative yesterday? Yes—a temporary alternative was found.
Key Takeaways
- لا النافية للجنس categorically excludes every member of an indefinite class.
- Its noun is in the accusative domain: simple nouns are built without tanwīn, annexed nouns are accusative without tanwīn, and شبه المضاف nouns are normally accusative with tanwīn.
- A one-word predicate is nominative; a verbal predicate keeps the mood required by its own clause.
- لا خبير... means “no expert,” whereas ليس كل خبير... means “not every expert.”
- After a negative question, بلى reverses the negation and نعم confirms it.
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Start learning Arabic →Related Topics
- Negation Scope with Quantifiers and CoordinationB2 — Control whether Arabic negation applies to every member, one constituent, or each coordinated alternative.
- بلى، بل، كلا and Correcting NegativesB2 — Confirm, reverse, or repair a proposition with بلى، بل، and كلا while keeping negative-question answers unambiguous.
- لا with Present and Habitual VerbsA1 — Negate present, habitual, and general verbal clauses with لا plus the indicative imperfect, and keep this pattern distinct from prohibition.