Most Esperanto verbs have a subject, even though their invariant ending does not identify it. A limited but important set can form a complete clause with no subject at all: Pluvas, Tagiĝis, Temas pri mono, Estas malvarme. English inserts dummy it in such sentences; Esperanto does not invent a pronoun where no participant exists.
Subjectless clauses are part of the foundational system, not casual ellipsis. The difficulty is knowing which predicates genuinely allow them and which merely place a real subject after the verb.
What “impersonal” means here
An impersonal—or subjectless—clause describes an event or situation without assigning the subject role to any participant. Pluvas is complete: rain is occurring, but no entity is grammatically “doing” the raining.
Pluvas de la mateno, kaj la stratoj jam estas inunditaj.
It has been raining since morning, and the streets are already flooded.
Kiam ni atingis la montpasejon, jam mallumiĝis.
When we reached the mountain pass, it was already getting dark.
English it in these translations does not refer to an object. Esperanto ĝi always points to something understood from context, so it is not used as a weather placeholder.
Compare a genuinely referential pronoun:
Kia estas la vetero? — Ĝi estas pli bona ol hieraŭ.
What is the weather like? — It is better than yesterday.
Here ĝi means la vetero. It is a real subject and can be replaced by that noun. No such replacement exists in simple Pluvas.
Core subjectless verb types
Several small semantic groups regularly occur without subjects.
| Type | Frequent forms | Example meaning |
|---|---|---|
| weather | pluvi, neĝi, hajli, ŝtormi, fulmi, tondri | rain, snow, hail, storm, lightning/thunder occur |
| ambient transition | tagiĝi, vesperiĝi, mallumiĝi, heliĝi | dawn or a change in light occurs |
| topic | temi pri | the matter under discussion is... |
| general evaluation | esti + adverb | the overall situation is cold, late, necessary... |
Baldaŭ tagiĝos; ni atendu ankoraŭ duonhoron.
It will dawn soon; let's wait another half hour.
Hieraŭ fulmis kaj tondris, sed preskaŭ ne pluvis.
There was lightning and thunder yesterday, but it hardly rained.
These verbs normally have no object either. A place, time, duration, cause, or other circumstance can still be added: pluvis en la urbo, tondris dum horo, mallumiĝis pro la nuboj.
Temi pri: stating the topic
Subjectless temi normally takes a pri complement naming the topic.
Pri kio temas la mesaĝo? — Temas pri ŝanĝo de la horaro.
What is the message about? — It's about a change to the schedule.
Ne temas pri la prezo; temas pri la kvalito de la laboro.
It isn't about the price; it's about the quality of the work.
The English it has no Esperanto counterpart. Pri la prezo is a complement, not a subject, so it retains pri.
Temi can also have an ordinary subject when a specific work or event has a topic:
La dokumenta filmo temas pri la vivo de rifuĝintoj.
The documentary is about the lives of refugees.
That clause is not impersonal: la dokumenta filmo is the subject. The two constructions are both standard and differ in information structure.
Esti plus an adverb for an ambient condition
When esti describes the general situation rather than a noun, the description takes adverbial -e.
Estas varme en la kuirejo, sed ekstere estas frostige malvarme.
It is warm in the kitchen, but outside it is freezing cold.
Jam estas malfrue; ni daŭrigu morgaŭ.
It is already late; let's continue tomorrow.
Compare the subjectful version:
La kuirejo estas varma, sed la koridoro estas malvarma.
The kitchen is warm, but the corridor is cold.
Varma agrees with the noun subject kuirejo. Subjectless estas varme has no noun for an adjective to describe, so the predicative expression is adverbial.
An experiencer may be added with al or por without becoming the subject:
Ĉu estas al vi malvarme? Mi povas fermi la fenestron.
Are you cold? I can close the window.
Estis embarase por ĉiuj, kiam neniu memoris lian nomon.
It was embarrassing for everyone when nobody remembered his name.
These prepositional phrases name the person affected by the condition, but malvarme and embarase remain adverbial because no noun subject bears the property. A personal rewording such as Ĉu vi malvarmas? is also possible, but it has vi as an ordinary subject and is therefore a different construction.
This pattern also expresses evaluation and necessity:
Estas grave konservi kopion de ĉiuj dokumentoj.
It is important to keep a copy of all the documents.
Estas necese, ke ĉiu gasto montru sian bileton ĉe la enirejo.
It is necessary for every guest to show their ticket at the entrance.
In traditional analysis, the infinitive konservi... or the ke-clause can be treated as the semantic subject of the evaluation. Either way, grave/necesse describes an action or proposition, not a noun, so -e is required.
Conventional verbs instead of esti + adverb
Esperanto can often turn the descriptive root directly into a verb:
Necesas kontroli la adreson antaŭ ol sendi la pakaĵon.
It is necessary to check the address before sending the package.
Eblas pagi per karto aŭ per telefono.
It is possible to pay by card or by phone.
Sufiĉas unu ekzemplo por klarigi la regulon.
One example is enough to explain the rule.
Necesas and eblas are equivalent in core meaning to estas necese and estas eble. In sufiĉas unu ekzemplo, however, unu ekzemplo can be analyzed as a postverbal subject: one example is sufficient. Do not assume that every verb-first clause lacks a subject.
Direct verb formation is normal only where the resulting verb has a conventional clear meaning. Esperanto word-building is productive, but a learner cannot safely replace every esti + adjective phrase with a newly invented verb.
Impersonal passives and infinitive subjects
When a passive description applies to an infinitive or whole situation, Esperanto uses an adverbial participle.
Estas malpermesate fumi en la stacidomo.
Smoking is prohibited in the station.
Estas rekomendate kontroli la horaron antaŭ la vojaĝo.
It is recommended to check the timetable before the trip.
Malpermesate and rekomendate are -e forms because they characterize the action fumi/kontroli, not a noun. Compare Fumado estas malpermesita, where noun subject fumado takes agreeing adjective malpermesita.
This impersonal passive pattern is useful in (formal) notices and administrative writing. In everyday conversation, an active construction with oni is often lighter: Oni ne rajtas fumi ĉi tie.
Oni is generic, not impersonal filler
Oni means an unspecified human agent: “people,” “one,” or generic “you.” It is a real subject.
En tiu restoracio oni servas tagmanĝon ĝis la tria.
That restaurant serves lunch until three.
The servers are unspecified people. By contrast, no hidden person causes the grammatical event in pluvas. Do not add oni to weather or ambient predicates.
An ordinary action verb still needs a subject. Esperanto's invariant ending does not make arbitrary subject omission possible:
Oni frapas ĉe la pordo. — Mi tuj rigardos, kiu estas tie.
Someone is knocking at the door. — I'll check who is there right away.
The generic human agent is relevant, so oni appears.
Subjectless versus existential clauses
Estas problemo en la sistemo often translates English “there is a problem,” but problemo is the entity being introduced and normally counts as a postverbal subject. It remains nominative.
En la ĉambro estas tri novaj seĝoj.
There are three new chairs in the room.
This differs from subjectless En la ĉambro estas tro malhele por legi “It is too dark in the room to read.” The first presents things; the second evaluates the ambient condition.
Word order helps information flow but does not create an object. The existential clauses page develops these presentational subjects.
Tense and mood still work normally
Subjectless verbs use the same invariant endings as every other verb:
| Ending | Example | Value |
|---|---|---|
| -i | pluvi | neutral infinitive |
| -as | pluvas | present/ongoing fact |
| -is | pluvis | past fact |
| -os | pluvos | future prediction |
| -us | pluvus | imagined weather |
| -u | pluvu | wished-for weather |
Se pluvus morgaŭ, ni okazigus la koncerton interne.
If it rained tomorrow, we would hold the concert indoors.
There is no person or number agreement because there is no subject—and even subjectful verbs use the same invariant form. -Us is conditional stance, not past tense; -u can voice a wish such as Pluvu nokte, sed estu sune tage!
Common Mistakes
Adding English dummy it
❌ Ĝi pluvas forte.
Incorrect — ĝi must refer to something; weather pluvi is subjectless.
✅ Pluvas forte.
It is raining hard.
Using an adjective in a subjectless condition
❌ Estas malvarma ĉi tie.
Incorrect without a noun subject — describe the situation with an adverb.
✅ Estas malvarme ĉi tie.
It is cold here.
Treating a postverbal subject as an object
❌ Estas problemon kun la karto.
Incorrect — the introduced problem is nominative, not an object.
✅ Estas problemo kun la karto.
There is a problem with the card.
Making a passive participle agree with an infinitive
❌ Estas malpermesita fumi ĉi tie.
Incorrect in the subjectless pattern — the participle describing fumi must be adverbial.
✅ Estas malpermesate fumi ĉi tie.
Smoking is prohibited here.
Adding esti as an English-style auxiliary
❌ Estas pluvas ekstere.
Incorrect — a finite weather verb does not take an auxiliary.
✅ Pluvas ekstere.
It is raining outside.
Key Takeaways
- True impersonal verbs form complete clauses without a subject; Esperanto adds neither dummy ĝi nor dummy oni.
- Weather verbs, ambient transitions, and subjectless temi pri are central patterns.
- Use esti + adverb for a general condition: estas varme, estas grave, estas necese.
- Oni is a genuine generic human subject, and existential nouns after estas are genuine presentational subjects.
- Subjectless verbs take the ordinary -i, -as, -is, -os, -us, -u endings without English-style auxiliaries.
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Start learning Esperanto →Related Topics
- Expressing the SubjectB1 — Learn how Esperanto expresses subjects with noun phrases, pronouns, clauses, and controlled omission despite invariant verb forms.
- Weather and Environmental VerbsB2 — Describe rain, snow, storms, light, temperature, and environmental change with subjectless and subjectful Esperanto verb patterns.
- Esti: To BeA2 — A complete reference to esti for identity, properties, location, existence, impersonal conditions, participial auxiliaries, and productive derivatives.
- OniB1 — Use oni for generic or unidentified human agents, with precise contrasts to vi, ili, passives, and reflexive si.
- Existential ClausesB2 — Present people, things, and situations with existential estas while keeping existence distinct from location and identification.