Negative Commands with لا الناهية | Arabic (Modern Standard) Grammar

Modern Standard Arabic forms a negative command with لا الناهية, “prohibitive lā,” followed by a jussive imperfect: لا تكتبْ “Don’t write.” The verb still marks who is being addressed, but prohibitive لا governs its mood. A sound singular verb loses the final indicative vowel; forms ending in ـان، ـون, or ـين lose their nūn; a final-weak verb may lose an entire weak letter.

This is not ordinary present negation. أنت لا تكتبُ هنا عادةً means “You do not write here usually,” with indicative تكتبُ. لا تكتبْ هنا tells someone not to write here, with jussive تكتبْ. Ordinary unvocalized spelling can hide the final-vowel contrast, so syntax and communicative force matter. The positive imperative uses a different stem shape; a prohibition keeps لا + imperfect.

The smallest useful paradigm

Use regular Form I كَتَبَ / يَكْتُبُ “write,” root ك-ت-ب, to see the endings clearly:

Addressee	Indicative statement	Negative command	Change
you, masculine singular	تَكْتُبُ	لَا تَكْتُبْ	final -u removed
you, feminine singular	تَكْتُبِينَ	لَا تَكْتُبِي	nūn removed
you two	تَكْتُبَانِ	لَا تَكْتُبَا	nūn removed
you, masculine plural	تَكْتُبُونَ	لَا تَكْتُبُوا	nūn removed; separator alif written
you, feminine plural	تَكْتُبْنَ	لَا تَكْتُبْنَ	feminine-plural nūn remains

The nūn in تكتبنَ is the feminine-plural subject suffix, not the indicative nūn of the “five verbs,” so prohibitive mood does not delete it.

لا تكتب اسمك في هذه الخانة

lā taktubi smaka fī hādhihi l-khāna

Do not write your name in this box. (One male addressee.)

Underlying تكتبْ is jussive. A connecting i appears before اسمك after hamzat al-waṣl is elided; it prevents a difficult consonant cluster and is not an indicative mood ending.

لا تكتبي كلمة المرور في الرسالة

lā taktubī kalimata l-murūri fī r-risāla

Do not write the password in the message. (One female addressee.)

لا تكتبا الملاحظات قبل سماع التعليمات

lā taktubā l-mulāḥaẓāti qabla samāʿi t-taʿlīmāt

Do not write the notes before hearing the instructions. (Two addressees.)

لا تكتبوا أرقام الهواتف على اللوحة

lā taktubū ʾarqāma l-hawātifi ʿalā l-lawḥa

Do not write phone numbers on the board. (A male or mixed group.)

لا تكتبن الإجابات بقلم أحمر

lā taktubna l-ʾijābāti biqalamin ʾaḥmar

Do not write the answers in red pen. (A female group.)

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Learn the addressee endings as a set. Jussive deletes the n of -īna, -āni, and -ūna, but it keeps the subject suffix -na in feminine plural تكتبنَ.

Prohibition versus present-time negation

Negating a present habit or fact uses non-governing لا النافية with the indicative. It describes; it does not command.

لا يستخدم الموظف هذا المدخل في المساء

lā yastakhdimu l-muwaẓẓafu hādhā l-madkhala fī l-masāʾ

The employee does not use this entrance in the evening.

لا تستخدم هذا المدخل بعد السادسة

lā tastakhdim hādhā l-madkhala baʿda s-sādisa

Do not use this entrance after six. (One male addressee.)

The third-person statement has indicative يستخدمُ. The second-person prohibition has jussive تستخدمْ. English uses do not in both statements and commands, but Arabic distinguishes the governor, person, and mood.

Prohibitive لا normally addresses someone directly, so the second-person prefix is essential. Gender and number do not disappear merely because English “you” is invariant.

لا تدخلي المختبر من دون بطاقة

lā tadkhulī l-mukhtabara min dūni biṭāqa

Do not enter the laboratory without a card. (One female addressee.)

لا تدخلوا القاعة قبل وصول المشرف

lā tadkhulū l-qāʿata qabla wuṣūli l-mushrif

Do not enter the hall before the supervisor arrives. (A male or mixed group.)

Real complements stay governed by the lexical verb

The jussive changes mood, not the verb’s valency. Form V تَأَخَّرَ / يَتَأَخَّرُ “be late,” root ء-خ-ر, still selects عن when meaning “be late for.” Form VIII اِعْتَمَدَ / يَعْتَمِدُ “rely,” root ع-م-د, still selects على.

لا تتأخر عن الموعد مرة أخرى

lā tataʾakhkhar ʿani l-mawʿidi marratan ʾukhrā

Do not be late for the appointment again.

لا تعتمدوا على نسخة قديمة من الدليل

lā taʿtamidū ʿalā nuskhatin qadīmatin mina d-dalīl

Do not rely on an old version of the guide.

A pattern label does not supply the English preposition. Learn the attested verb, its principal parts, and its complements.

Weak-final verbs delete a letter

For final-weak Form I دَعَا / يَدْعُو “call/invite,” root د-ع-و, jussive تَدْعُ loses written final و. For رَمَى / يَرْمِي “throw,” root ر-م-ي, jussive تَرْمِ loses ي.

لا تدع أحدا إلى الدخول من دون تصريح

lā tadʿu ʾaḥadan ʾilā d-dukhūli min dūni taṣrīḥ

Do not invite anyone to enter without authorization.

لا ترم البطاريات مع النفايات العادية

lā tarmi l-baṭṭāriyāti maʿa n-nufāyāti l-ʿādiyya

Do not throw batteries away with ordinary waste. (One male addressee.)

The surviving u in تدعُ and i in ترمِ belong to the shortened stem; they are not indicative endings. “Add sukūn” is therefore not a complete account of jussive formation.

Do not confuse لا تَدْعُ “do not invite,” from دَعَا / يَدْعُو and root د-ع-و, with لا تَدَعْ “do not leave/let,” conventionally associated with وَدَعَ / يَدَعُ and root و-د-ع. Unvocalized لا تدع can represent either form, so meaning and the verified lexical family matter.

Geminate verbs can contract or unfold

With geminate Form I رَدَّ / يَرُدُّ “reply/return,” root ر-د-د, formal Arabic permits contracted jussive لا تَرُدَّ and an expanded form لا تَرْدُدْ in the appropriate singular environment. The contracted form is very common.

لا ترد على الرسالة قبل مراجعة المرفقات

lā tarudda ʿalā r-risālati qabla murājaʿati l-murfaqāt

Do not reply to the message before reviewing the attachments.

The final fatḥa prevents an unpronounceable contracted ending; it does not make the verb subjunctive. Geminate alternatives are part of the verified paradigm, not a reason to regularize every verb by analogy.

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Identify the jussive by governor plus stem behavior. A surviving short vowel in لا تدعُ or لا تردَّ can belong to the stem or phonological repair even though the verb is jussive.

Register and force

The construction is standard (formal) MSA. Its social force ranges from advice to firm prohibition according to vocabulary, politeness, and context. Add من فضلك “please” or a reason when appropriate; grammar alone does not make an order courteous.

لا تغلقوا النوافذ من فضلكم، فالقاعة حارة

lā tughliqū n-nawāfidha min faḍlikum, fal-qāʿatu ḥārra

Please do not close the windows; the hall is hot.

Regional colloquial varieties use different negative-command systems (regional). Do not insert an unlabelled dialect particle into formal prose.

Common Mistakes

Keeping the indicative nūn after prohibitive لا

❌ لا تكتبون الأسماء هنا

Incorrect as a command—prohibitive لا requires jussive تكتبوا.

✅ لا تكتبوا الأسماء قبل التحقق منها

lā taktubū l-ʾasmāʾa qabla t-taḥaqquqi minhā

Do not write the names before verifying them.

Using one genderless form for every “you”

❌ لا تدخلي يا خالد

Incorrect — masculine singular Khalid requires تدخل, not feminine تدخلي.

✅ لا تدخل يا خالد قبل بدء الجلسة

lā tadkhul yā khālidu qabla badʾi l-jalsa

Do not enter, Khalid, before the session begins.

Treating ordinary present negation as a command

❌ لا يراجع المدير الملفات عادة

Incorrectly treated as a command—this third-person indicative means ‘The director does not usually review the files.’

✅ لا تراجع هذه الملفات الآن

lā turājiʿ hādhihi l-milaffāti l-ʾān

Do not review these files now. (One male addressee.)

Retaining a final weak letter

❌ لا ترمي الأوراق هنا يا طارق

Incorrect for masculine singular Tariq—jussive ترمِ loses final ي.

✅ لا ترم الأوراق قرب المدفأة

lā tarmi l-ʾawrāqa qurba l-midfaʾa

Do not throw the papers near the heater.

Assuming every jussive ends in audible sukūn

❌ لا تدعو أحدا يا سامر

Incorrect as a command to one man—the masculine singular jussive is تدعُ, written تدع without final و.

✅ لا تدع ضيفا إلى الاجتماع قبل تأكيد الموعد

lā tadʿu ḍayfan ʾilā l-ijtimāʿi qabla taʾkīdi l-mawʿid

Do not invite a guest to the meeting before confirming the time.

Key Takeaways

Negative commands use لا الناهية + jussive imperfect; present statements use non-governing لا + indicative.
Sound singulars lose the final mood vowel, the five verbs lose nūn, and feminine plural ـنَ remains.
Final-weak jussives delete a weak letter, while geminate verbs can use contracted or expanded standard forms.
Preserve the lexical verb’s person agreement and complements; English “don’t” does not supply them.

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