The core meaning of sur is significant contact with a surface: support, attachment, pressure, or contact-based covering. The surface may be horizontal, vertical, curved, or conceptual. Directional -n distinguishes an established contact position from movement that creates one, while abstract uses preserve the idea of an effect, burden, or focus landing on a target.
Supported by a surface
The most familiar use is an object resting on top of a supporting surface:
La fakturo kaj la kvitanco kuŝas sur mia skribotablo.
The invoice and the receipt are lying on my desk.
Ni matenmanĝis sur la balkono antaŭ ol la strato fariĝis brua.
We had breakfast on the balcony before the street became noisy.
— Kie mi lasis miajn okulvitrojn? — Ili estas sur la breto apud la pordo.
— Where did I leave my glasses? — They are on the shelf beside the door.
These are static locations, so the complement has no -n. The contact may be direct or mediated by an obvious layer: a cup can be sur la tablo even when a tablecloth lies between them.
Vertical, curved, and bodily surfaces
A surface need not face upward. Attachment to a wall, a mark on skin, or clothing on a body can all use sur:
Sur la ekstera muro aperis longa fendo post la tertremo.
A long crack appeared on the outside wall after the earthquake.
Ŝi havis etan makulon de farbo sur la vango.
She had a small spot of paint on her cheek.
Li ankoraŭ havis sian malsekan mantelon sur si.
He still had his wet coat on.
The spatial model is contact with the relevant surface, not necessarily a literal “top.” The same explains kisi iun sur la frunto: the forehead is the contacted body surface.
La patrino kisis la infanon sur la frunto kaj estingis la lampon.
The mother kissed the child on the forehead and switched off the lamp.
Surface or containing space: sur versus en
Some places can be construed either as a surface or as an area with boundaries. Esperanto allows the speaker to choose the relevant image:
La infanoj ludas sur la korto, sed iliaj bicikloj restas en la garaĝo.
The children are playing in the courtyard, but their bicycles remain in the garage.
Sur la korto views the courtyard as ground surface. En la korto is also possible when its enclosed area matters. Similarly, sur la kampo foregrounds land surface; en la kampo foregrounds the surrounding space or vegetation.
Streets show the same accepted variation. Sur la strato is common when the roadway or public outdoor surface is salient; en la strato treats the street as an urban corridor. This is a genuine construal choice, not a regional dialect split.
By contrast, sur la ĉambro cannot normally mean “in the room,” because a room is canonically a container. Use en la ĉambro unless its outer surface is literally meant.
Position on a surface versus movement onto it
Add directional -n when an object or participant moves from elsewhere into a new surface-contact position:
Bonvolu meti la varman paton sur la lignan tabulon, ne rekte sur la tablon.
Please put the hot pan on the wooden board, not directly on the table.
La infano grimpis sur la seĝon por atingi la supran breton.
The child climbed onto the chair to reach the upper shelf.
Compare the resulting position:
La infano nun staras sur la seĝo kaj ne volas malsupreniri.
The child is now standing on the chair and does not want to climb down.
The logic is al loko sur X for sur X-n, versus en loko sur X for plain sur X. A motion verb does not automatically require -n; see Prepositions with Optional Directional -n for the general system:
Ŝi kuris sur la malseka trotuaro kaj preskaŭ glitis.
She ran on the wet sidewalk and almost slipped.
The running occurs while contact with the sidewalk continues. Ŝi kuris sur la trotuaron would mean that she ran from elsewhere onto it.
With verbs of attachment such as pendigi or fiksi, established usage sometimes leaves the complement unmarked because the verb and sur already present attachment rather than a path. When the endpoint contrast is important, a clear placement verb plus -n avoids doubt. This is accepted variation, not permission to add -n after every action verb.
Onto a person, responsibility, or burden
The contact image extends to things assumed by a person:
Post la demisio ŝi prenis sur sin la respondecon pri la tuta projekto.
After the resignation, she took responsibility for the entire project upon herself.
Ne metu la kulpon sur min pro decido, kiun mi ne faris.
Do not put the blame on me for a decision I did not make.
Directional -n appears because the burden or responsibility comes to rest figuratively on the person: sur sin, sur min. Once the state is established, plain sur is possible in a static description, though idiomatic wording with havi or a direct verb is often smoother.
Effects can similarly be directed at a target:
La novaĵo faris profundan impreson sur ĉiuj ĉeestantoj.
The news made a profound impression on everyone present.
This established efiko/impreso sur pattern identifies what receives the effect. It is not interchangeable with pri, which marks subject matter.
Topic, basis, and focus: resist English “on”
English freely uses on for a topic: a lecture on climate policy. Neutral Esperanto normally uses pri:
La profesoro prelegos pri klimata politiko, ne pri veterprognozado.
The professor will lecture on climate policy, not on weather forecasting.
Some abstract expressions retain a surface-like relation. A conclusion may be bazita sur datumoj, because the data serve as its support; attention may be directed sur ion in older or emphatically directional phrasing. Nevertheless, general topic is pri, not sur.
La raporto estas bazita sur intervjuoj kun kvindek loĝantoj.
The report is based on interviews with fifty residents.
Ni koncentru la atenton sur la du problemojn, kiujn ni povas solvi hodiaŭ.
Let us focus our attention on the two problems we can solve today.
The last sentence contains directional -n: attention is metaphorically directed onto a new target. A static la atento estas sur la problemo is possible but often heavier than la atento koncentriĝas pri/al.... For internationally clear prose, keep pri for topic, sur for support, target, or effect.
Vague je cannot replace conventional sur in either physical or established abstract uses: bazi la decidon sur pruvoj, not je pruvoj. A bare accusative works only where the verb itself takes a direct object; it does not independently mean “on a surface.”
Instruments played “on” a surface
With some musical instruments, sur presents the contacted instrument surface:
Ŝi ludis la melodion sur piano, dum ŝia frato akompanis ŝin per violono.
She played the melody on a piano while her brother accompanied her with a violin.
Per presents an instrument as the means used; sur presents the performance on the instrument's playable surface or system. Both construals are possible in appropriate contexts. When a separate tool is involved, the roles become clear: ludi gitaron per plektro, “play a guitar with a pick.”
Looking or directing action onto a target
Directional sur + -n can mark the endpoint of gaze, attack, selection, or another directed action:
Ĉiuj okuloj subite fiksiĝis sur la novan parolanton.
All eyes suddenly fixed on the new speaker.
De la montopinto ni rigardis malsupren sur la lumigitan urbon.
From the mountaintop we looked down at the illuminated city.
This use is standard, but a lexical verb may select another construction: rigardi ion commonly takes a direct object, and ataki iun does too. Do not mechanically place sur after every English verb followed by on.
Derived forms and compounds
Literal compounds include surtabla “on the table/tabletop,” surtera “on land/ground,” surmeti “put on,” and surskribo “inscription.” Surhavi means be wearing or have on one's person.
Bonvolu surmeti protektajn okulvitrojn antaŭ ol ekuzi la maŝinon.
Please put on safety glasses before you start using the machine.
Compounds can lexicalize. Surskribo is not simply any text physically above something; it is writing placed on a surface. Use separate words when the attachment or direction must remain explicit.
Norm and register
Surface contact, support, bodily contact, and directional sur + -n are foundational. The courtyard, street, field, and sky alternations with en reflect accepted differences in construal. They should not be “corrected” without considering the intended image.
Abstract burdens, effects, and bases are standard across registers. Dense expressions such as bazi konkludon sur datumoj are especially common in (formal) and (academic) writing. Using sur as a general topic marker under English influence is not recommended; pri is the stable international choice.
Common Mistakes
Omitting -n after clear placement onto a surface
❌ Mi metis la ŝlosilojn sur la breto.
Incorrect for the placement meaning — the keys move onto the shelf.
✅ Mi metis la ŝlosilojn sur la breton.
I put the keys on the shelf.
Adding -n for movement that stays on the surface
❌ Ni promenis sur la plaĝon dum du horoj.
Wrong for the intended activity on the beach — this says we walked onto the beach.
✅ Ni promenis sur la plaĝo dum du horoj.
We walked on the beach for two hours.
Using sur for higher position without contact
❌ La aviadilo flugas sur la nuboj.
Wrong for the intended position above the clouds — sur implies relevant contact or support.
✅ La aviadilo flugas super la nuboj.
The plane is flying above the clouds.
Calquing English topic “on”
❌ Mi legis artikolon sur artefarita inteligenteco.
Incorrect as a neutral topic expression — use pri.
✅ Mi legis artikolon pri artefarita inteligenteco.
I read an article on artificial intelligence.
Key Takeaways
- Sur profiles contact, support, attachment, pressure, or contact-based covering.
- Plain sur marks an established relation or motion on a surface; sur + -n marks movement onto it.
- Places such as courtyards, streets, and fields permit sur/en according to surface versus containing-space construal.
- Abstract sur can mark a burden, effect, supporting basis, or directed focus, but general topic takes pri.
- Contrast sur with contactless super, containing en, and instrumental per.
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- SuperB2 — Use super for a higher position normally without contact, movement into that position, covering, and figurative superiority or control.
- SubB2 — Use sub for a lower position, movement into that position, covering relations, and figurative dependence or control.
- EnB1 — Use en for location within a place, period, or state, and add directional -n when something enters a new interior or result.
- PriB2 — Use pri to mark a topic, concern, or matter that an action, text, thought, or relationship is about.
- PerB1 — Use per for an instrument, means, method, channel, or intermediary through which an action is carried out.
- Prepositions with Optional Directional -NA1 — Learn when local Esperanto prepositions combine with directional -n, when they describe a static location, and where accepted variation reflects different viewpoints.