Je is Esperanto's semantically open preposition: it marks a relationship without naming that relationship as precisely as al, de, per, pri, or a spatial preposition would. It is not a universal translation of English “at.” Modern usage concentrates it in several conventional patterns—especially clock time, measures, affected body parts, and certain adjective or verb complements.
A fallback, not a meaningless filler
The Fundamento permits je where no existing preposition fits, and also permits an accusative without a preposition in many such cases. That freedom does not make every choice equally clear. Contemporary neutral Esperanto prefers a specific preposition whenever the relation is established.
La kunveno komenciĝos je la naŭa.
The meeting will begin at nine.
Ni parolis pri la buĝeto dum la tuta mateno.
We talked about the budget all morning.
The clock-time je is conventional. By contrast, pri already expresses topic, so replacing it with je would hide useful information.
Clock time and other time points
The most frequent use is a clock point:
— Je kioma horo foriras la lasta trajno? — Je la deka kaj dek kvin.
— What time does the last train leave? — At ten fifteen.
Bonvolu telefoni al mi morgaŭ je la oka vespere.
Please call me tomorrow at eight in the evening.
The complement stays nominative: je la oka, not je la okan. Je already marks the temporal role.
Names of festivals and special occasions can also follow je:
Je Kristnasko la tuta familio kutime manĝas kune.
At Christmas the whole family usually eats together.
For days and dates, other constructions are normally clearer: lunde, la dek-duan de Majo, en 2027. Je is available for a time construed as an occasion, but it should not replace the ordinary calendar system.
Measure and difference
Je can introduce the amount by which two values differ:
La nova breto estas je dek centimetroj pli larĝa ol la malnova.
The new shelf is ten centimeters wider than the old one.
La bileto kostas je kvin eŭroj malpli en la retejo.
The ticket costs five euros less on the website.
An accusative measure is often more concise: dek centimetrojn pli larĝa, kvin eŭrojn malpli. Je is especially useful when the measure is long, strongly contrasted, or built around a word such as kiom, which cannot take -n:
Je kiom la dua propono estas pli multekosta?
By how much is the second proposal more expensive?
This is a genuine alternation between je + measure and bare accusative measure. Do not combine them as je dek centimetrojn.
The affected body part
With grabbing, holding, biting, or bodily impairment, je can identify the body part affected:
La patrino prenis la infanon je la mano antaŭ ol transiri la straton.
The mother took the child by the hand before crossing the street.
La hundo kaptis la ludilon je unu fino kaj ne volis ellasi ĝin.
The dog grabbed the toy by one end and would not let go.
This differs sharply from per, which marks an instrument. Li kaptis min je la brako means that my arm was grasped; li kaptis min per la brako would mean that he used an arm as the means of catching me.
The same affected-part relation appears in descriptions such as lama je unu piedo or malsana je la brusto, although contemporary speakers often choose a more explicit medical phrasing.
Content, abundance, lack, and states
Several adjectives and verbs conventionally allow je before the content or condition involved:
La regiono estas riĉa je mineraloj sed malriĉa je trinkebla akvo.
The region is rich in minerals but poor in drinking water.
Post la longa promenado ĉiuj estis soifaj je malvarma akvo.
After the long walk everyone was thirsty for cold water.
La malnova dosiero estas plena je eraroj.
The old file is full of errors.
De is also accepted in several of these frames: plena de eraroj, libera de mankoj. Per may be natural when something is physically covered by a material. The choice reflects construal: je leaves the content relation general; de presents filling or absence; per presents means or material coverage.
Do not generalize from one adjective to all others. Conventional complements still need to be learned with their heads; Verb–Preposition Frames explains this principle in detail.
Kredi je, kredi al, and kredi ion
This three-way contrast shows why precision matters:
Mi kredas je la valoro de libera edukado.
I believe in the value of free education.
Mi kredas al vi, sed mi volas kontroli la ciferojn.
I believe you, but I want to check the figures.
Mi ne kredas tiun onidiron.
I do not believe that rumor.
Kredi je affirms existence, reality, value, or efficacy. Kredi al persono means trusting that the person speaks truthfully. A direct object is the proposition or claim accepted as true. English uses believe for all three, but Esperanto exposes the semantic difference.
Other established abstract patterns
Several expressions retain conventional je:
- kalkuli je helpo — count on help;
- veti je rezulto/premio — stake or bet on a result/prize;
- je mia surprizo — to my surprise;
- ŝanĝi ion je io alia — change something into/for something else, though more specific alternatives are often preferred.
Vi povas kalkuli je nia helpo dum la translokiĝo.
You can count on our help during the move.
Je mia surprizo, la kliento tuj akceptis la unuan proponon.
To my surprise, the client immediately accepted the first proposal.
These are lexicalized or construction-specific islands, not evidence that je may replace every abstract preposition.
Where je should give way to something precise
Use al for a target or recipient, pri for a topic, per for an instrument, de for source or separation, and an ordinary local preposition for place:
| Meaning | Clear form | Avoid as neutral usage |
|---|---|---|
| reply to a person | respondi al ŝi | respondi je ŝi |
| talk about a plan | paroli pri plano | paroli je plano |
| write with a pen | skribi per plumo | skribi je plumo |
| wait at the station | atendi ĉe la stacidomo | atendi je la stacidomo |
Early Esperanto used je more widely. Such examples are (archaic) or author-specific where present-day usage has settled on a clearer preposition. They remain understandable but are not the best productive model.
Case and word formation
Like ordinary prepositions, je normally takes a complement without accusative -n: je la sesa, je unu metro, je la brako. Where an accusative can replace je, choose one construction or the other: je tri tagoj pli frue or tri tagojn pli frue.
Experimental object-marking je—for example, using it merely to avoid adding -n to a name or quotation—is nonstandard. Direct objects still use the accusative or a clearly supported alternative construction.
Unlike spatial prepositions, je does not productively form a useful family such as a common jea adjective or jee adverb. Its semantic openness provides too little content for ordinary compounds. Established full expressions are clearer.
Norm and usage
The fallback role of je is foundational, as are the option of replacing it with -n where meaning permits and its conventional use for clock time. Modern usage is narrower than early usage. The pedagogical recommendation is not “avoid je,” but “reserve it for a real gap or an established pattern.”
In both (informal) and (formal) Esperanto, je la oka, je kiom, preni je la mano, and kredi je are normal. In (formal) prose, a more precise preposition is particularly valuable when several abstract complements compete.
Common Mistakes
Adding accusative after je
❌ La filmo komenciĝas je la okan.
Incorrect — je already marks the clock time.
✅ La filmo komenciĝas je la oka.
The film begins at eight.
Using je for an ordinary location
❌ Mi atendos vin je la stacidomo.
Incorrect as the neutral location expression — use ĉe or en.
✅ Mi atendos vin ĉe la stacidomo.
I will wait for you at the station.
Hiding an established recipient relation
❌ Bonvolu respondi je mia demando.
Incorrect in the conventional frame — respondi takes al.
✅ Bonvolu respondi al mia demando.
Please answer my question.
Using nonstandard je as an object marker
❌ Ŝi tre amas je siajn nevojn.
Incorrect — je is not a standard direct-object marker, and the phrase also double-marks the role.
✅ Ŝi tre amas siajn nevojn.
She loves her nephews very much.
Key Takeaways
- Je is semantically open, but modern usage favors it in conventional patterns or where no precise preposition fits.
- Its main productive uses include clock time, measure differences, affected body parts, and selected complements.
- Kredi je, kredi al, and kredi ion express different relationships.
- A complement after je normally has no -n; accusative measure is an alternative, not an addition.
- Prefer a precise conventional preposition over vague je whenever one exists.
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Start learning Esperanto →Related Topics
- AlA2 — Use al for movement toward a goal, recipients, orientation, and abstract targets without adding an unnecessary accusative ending.
- DeA2 — Use de for movement or development away from a source and for relationships such as possession, authorship, composition, time, and passive agency.
- PerB1 — Use per for an instrument, means, method, channel, or intermediary through which an action is carried out.
- PriB2 — Use pri to mark a topic, concern, or matter that an action, text, thought, or relationship is about.
- Telling Clock TimeA1 — Ask and tell the time in Esperanto with ordinal hours, cardinal minutes, fractions, day-part expressions, and the correct time prepositions.
- No Accusative after Ordinary PrepositionsA1 — Learn why ordinary Esperanto prepositions take unmarked complements and how to distinguish them from directional and exceptional combinations with -n.