جَلَسَ / يَجْلِسُ is the basic formal-MSA verb “sit, sit down, be seated.” It is a sound Form-I verb from root ج-ل-س, so its consonants remain stable throughout the paradigm. The real difficulty is not the conjugation but the location frame: جلس على presents a supporting surface or seat, while جلس في locates the person inside a room, building, vehicle, or broader setting.
English uses sit on a chair but sit in an armchair, and often lets the type of seat decide the preposition. Arabic draws its own distinction. على الكرسي treats the chair as physical support; في الغرفة treats the room as the containing location. Both can appear together because they answer different spatial questions.
The posture contrast with standing is developed in وقف — stand.
Principal parts and lexical profile
| Item | Verified form | Meaning or use |
|---|---|---|
| root and Form | ج-ل-س، Form I | sound, usually intransitive verb |
| perfect | جَلَسَ | he sat / sat down |
| imperfect | يَجْلِسُ | he sits / is sitting |
| imperative | اِجْلِسْ | sit down! |
| maṣdar | جُلُوسٌ | sitting, being seated |
| active participle | جَالِسٌ | seated, sitting |
| basic passive | not productive | the central “sit” sense is intransitive |
| causative | أَجْلَسَ — يُجْلِسُ | seat someone / make someone sit |
Store جَلَسَ — يَجْلِسُ — اِجْلِسْ — جُلُوسًا together: Form I does not let you safely infer the imperfect vowel or maṣdar. The imperative begins with hamzat al-waṣl. It is pronounced ijlis initially, but the glottal onset disappears after a preceding vowel: واجلس wajlis.
جلس الضيوف في الصالة قبل بدء الحفل
jalasa ḍ-ḍuyūfu fī ṣ-ṣālati qabla badʾi l-ḥafl
The guests sat in the hall before the ceremony began. (Formal neutral.)
كان الحارس جالسا عند المدخل طوال الليل
kāna l-ḥārisu jālisan ʿinda l-madkhali ṭiwāla l-layl
The guard was sitting by the entrance all night. (Formal neutral.)
A compact working paradigm
Because جلس is sound, no radical disappears. The perfect uses جلسـ before suffixes, and the imperfect uses the stem ـجلسـ. Mood affects the final vowel in singular forms and deletes nūn in the five verbs.
| Environment | Form | Meaning |
|---|---|---|
| perfect, 1 sg. | جَلَسْتُ | I sat / sat down |
| indicative, 3 m.sg. | يَجْلِسُ | he sits / is sitting |
| subjunctive after لن | لَنْ يَجْلِسَ | he will not sit |
| jussive after لم | لَمْ يَجْلِسْ | he did not sit |
| imperative | اِجْلِسْ، اِجْلِسِي، اِجْلِسُوا | sit! (m.sg., f.sg., m./mixed pl.) |
لن نجلس هنا لأن المقاعد مبللة
lan najlisa hunā liʾanna l-maqāʿida muballala
We will not sit here because the seats are wet. (Formal neutral.)
اجلسي بجانب النافذة إذا أردت ضوءا أفضل
ijlisī bijānibi n-nāfidhati ʾidhā ʾaradti ḍawʾan ʾafḍal
Sit beside the window if you want better light. (Formal instruction to one woman.)
ادخل واجلس أمام مكتب الموظف
udkhul wajlis ʾamāma maktabi l-muwaẓẓaf
Come in and sit in front of the employee's desk. (Formal instruction; the imperative hamza elides after wa-.)
على: the supporting seat or surface
Use على when the complement is what physically supports the seated person: على كرسي، على المقعد، على الأرض، على حافة السرير. The phrase answers “on what?” rather than “within what place?” This is the ordinary Arabic frame even where English happens to choose in, as with many kinds of chair.
جلس الطفل على الأرض ليرتب ألعابه
jalasa ṭ-ṭiflu ʿalā l-ʾarḍi liyurattiba ʾalʿābah
The child sat on the floor to arrange his toys. (Formal neutral.)
جلست المريضة على كرسي قريب من الباب
jalasati l-marīḍatu ʿalā kursiyyin qarībin mina l-bāb
The patient sat on a chair near the door. (Formal neutral.)
في: the containing place or setting
Use في with a room, office, garden, café, vehicle, or other location understood as the setting around the sitter: في الغرفة، في المكتب، في الحافلة. It can also locate a meeting or session in an institution. في does not tell the listener what physical object supports the body.
جلسنا في المقهى حتى توقف المطر
jalasnā fī l-maqhā ḥattā tawaqqafa l-maṭar
We sat in the café until the rain stopped. (Formal neutral.)
جلس المدير في المقعد الخلفي من السيارة
jalasa l-mudīru fī l-maqʿadi l-khalfiyyi mina s-sayyāra
The director sat in the back seat of the car. (Formal neutral; في presents an enclosed seat position.)
The last example shows that spatial construal matters. على المقعد focuses on the seat as support; في المقعد الخلفي من السيارة treats “the back seat” as an assigned position within the car. Neither preposition has a single English equivalent that works in every context.
جلس في الغرفة على مقعد خشبي قرب المدفأة
jalasa fī l-ghurfati ʿalā maqʿadin khashabiyyin qurba l-midfaʾa
He sat in the room on a wooden seat near the fireplace. (Formal; في gives the setting and على the support.)
Other location frames and ranked senses
عند places someone at or by a landmark; أمام، خلف، بجانب، قرب locate the sitter relationally. مع means “with” when companionship matters. More formal جلس إلى فلان can mean “sat with/beside someone,” but جلس مع is usually the clearer neutral contemporary choice for participating together.
جلس المحامي مع موكله لمراجعة الوثائق
jalasa l-muḥāmī maʿa muwakkilihi limurājaʿati l-wathāʾiq
The lawyer sat down with his client to review the documents. (Formal neutral.)
The primary sense is assuming or maintaining a seated posture. From it comes “sit down with someone” for a discussion, and the formal institutional use “convene/sit to consider a case,” especially with bodies such as courts or committees. In that institutional use, the subject is the body whose members meet.
جلست المحكمة للنظر في الطلب صباح الاثنين
jalasati l-maḥkamatu lin-naẓari fī ṭ-ṭalabi ṣabāḥa l-ithnayn
The court sat to consider the application on Monday morning. (Formal legal register.)
The basic verb is intransitive. To seat another person, use Form IV أجلس: أجلس الممرض المريض على الكرسي “the nurse seated the patient on the chair.” A bare passive of basic جلس is therefore not the normal equivalent of English “was seated”; use جلس, كان جالسا, or the passive of the causative أُجلس if someone made or placed the person in a seat.
أجلس المضيف الضيفة في المقعد الأمامي
ʾajlasa l-muḍīfu ḍ-ḍayfata fī l-maqʿadi l-ʾamāmī
The host seated the guest in the front seat. (Formal neutral; causative Form IV.)
High-frequency collocations
| Collocation | Meaning and register |
|---|---|
| جَلَسَ عَلَى كُرْسِيٍّ / الْأَرْضِ | sit on a chair / the ground (neutral) |
| جَلَسَ فِي الْغُرْفَةِ / الْمَكْتَبِ | sit in the room / office (neutral) |
| جَلَسَ مَعَ شَخْصٍ | sit down / meet with someone (neutral formal) |
| جَلَسَ لِلنَّظَرِ فِي | sit to consider (formal legal or institutional) |
| طُولُ الْجُلُوسِ | prolonged sitting (formal, especially health contexts) |
| مَكَانُ الْجُلُوسِ | seating area / place to sit (neutral formal) |
Common Mistakes
Copying the English seat preposition
❌ جلس في الكرسي قرب النافذة
Incorrect for the ordinary support reading—use على الكرسي; في is possible only with a context that construes the seat as an enclosed or assigned position.
✅ جلس على الكرسي قرب النافذة
jalasa ʿalā l-kursiyyi qurba n-nāfidha
He sat on the chair near the window.
Using على for the containing room
❌ جلسنا على قاعة الانتظار
Incorrect—the waiting room is the containing location, so it takes في.
✅ جلسنا في قاعة الانتظار
jalasnā fī qāʿati l-intiẓār
We sat in the waiting room.
Using the intransitive verb with a direct object
❌ جلس الممرض المريض على الكرسي
Incorrect for ‘the nurse seated the patient’—basic جلس is intransitive; use causative أجلس.
✅ أجلس الممرض المريض على الكرسي
ʾajlasa l-mumarriḍu l-marīḍa ʿalā l-kursī
The nurse seated the patient on the chair.
Giving the imperative a permanent pronounced hamza
❌ واجلس هنا من فضلك
wa-ʾijlis hunā min faḍlik
Incorrect connected reading—the initial hamza is hamzat al-waṣl and elides after wa-.
✅ واجلس هنا من فضلك
wajlis hunā min faḍlik
And sit here, please.
Key Takeaways
- Learn جلس، يجلس، اجلس، جلوس، جالس as one verified bundle.
- على identifies the supporting seat or surface; في identifies the containing place or setting.
- Both phrases may occur together because they answer different spatial questions.
- Basic جلس is intransitive; use أجلس when someone seats another person.
- In formal institutional prose, a court or committee may يجلس للنظر في a matter.
Now practice Arabic
Reading grammar gets you part of the way. The exercises are where it sticks — free, no signup needed.
Start learning Arabic →Related Topics
- سار — walkB1 — Conjugate the hollow-yāʾ verb سار and use its movement, progress, route, and process-development frames accurately.
- وقف — standB1 — Conjugate the assimilated verb وقف, use its posture and stopping frames, and distinguish it from the causative أوقف.
- كان — beA2 — Reference the hollow verb كان across its full paradigm, copular and existential senses, predicate case, conditionals, and high-frequency collocations.