Kompreni: To Understand | Esperanto Grammar

Kompreni is the regular transitive verb “to understand”: mentally grasp a message, reason, system, person, or situation. It takes a direct object without a preposition, and it also introduces ke-clauses and embedded questions. The derivative ekkompreni highlights the moment when understanding begins—often English “realize.”

Complete regular paradigm

Form	Function	Typical translation
kompreni	infinitive	to understand
komprenas	present indicative	understand(s)
komprenis	past indicative	understood
komprenos	future indicative	will understand
komprenus	conditional	would understand
komprenu	volitive	understand!, be aware!, let ... understand

The stem kompren- remains unchanged, and the form does not vary by person or number: mi komprenas, ŝi komprenas, ili komprenas.

Mi komprenas la vortojn, sed ne la ŝercon malantaŭ ili.

I understand the words but not the joke behind them.

Ĉu vi komprenus la instrukciojn sen la bildoj?

Would you understand the instructions without the pictures?

Komprenu, ke ni ne povas ŝanĝi la kontrakton post la limdato.

Understand that we cannot change the contract after the deadline.

The volitive komprenu is less common as a bare command than aŭskultu or rigardu, because understanding cannot simply be willed. It naturally introduces a point the listener must recognize: Komprenu, ke....

A direct object without a preposition

The thing understood takes accusative -n. It can be language, speech, a text, an explanation, a rule, a mechanism, or a situation.

La aplikaĵo estas simpla, sed mi ankoraŭ ne komprenas ĝian serĉfunkcion.

The app is simple, but I still don't understand its search function.

Ŝi bone komprenas parolatan Esperanton, sed ankoraŭ hezitas paroli.

She understands spoken Esperanto well but still hesitates to speak.

Mi komprenas vian zorgon, tamen ni bezonas pli da pruvoj antaŭ ol decidi.

I understand your concern, but we need more evidence before deciding.

English “understand” is also transitive, but learners sometimes insert al because the object is a person or because other communication verbs take a recipient. Kompreni lin is correct: the person is what the subject mentally grasps.

Mi ne ĉiam konsentas kun mia frato, sed mi komprenas lin.

I don't always agree with my brother, but I understand him.

Understanding a person does not necessarily mean hearing their words, agreeing with them, or knowing them personally. It means grasping their meaning, reasons, or feelings.

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Whatever is mentally grasped—words, a system, a situation, or a person—is the direct object of kompreni and receives -n.

Understanding a fact: kompreni, ke...

A ke-clause presents a complete situation that has become intelligible.

Nun mi komprenas, ke la unua paŝo devas esti farita antaŭ la ĝisdatigo.

Now I understand that the first step has to be done before the update.

Ŝi ne komprenis, ke lia silento estis respondo.

She did not understand that his silence was an answer.

The embedded verb uses the tense demanded by its own time reference. Esperanto does not automatically backshift after komprenis. Compare komprenis, ke li estas malsana if the illness is presented as current with komprenis, ke li estis malsana if it is located in the past.

Kompreni tion, ke... is possible when tion has a discourse function—perhaps contrast or emphasis—but plain kompreni, ke... is normally lighter.

Understanding a question, reason, or method

An embedded question begins with kial, kiel, kio, kiu, ĉu, or another interrogative expression. It names the unknown relation that the subject does or does not grasp.

Mi komprenas, kial vi rifuzis la unuan proponon.

I understand why you rejected the first proposal.

La teknikisto tuj komprenis, kiel la akvo eniris la aparaton.

The technician immediately understood how the water entered the device.

Mi ne komprenas, ĉu la rabato validas nur hodiaŭ aŭ dum la tuta semajno.

I can't tell whether the discount is valid only today or throughout the week.

Do not add ke before an interrogative word: kompreni, kial..., not kompreni, ke kial.... The interrogative itself introduces the embedded question.

— Ĉu vi komprenas, kion ni devas fari? — Jes, unue ni konservu kopion.

— Do you understand what we have to do? — Yes, first let's save a copy.

Kompreni versus ekkompreni

Simple kompreni can describe a state, process, or achieved grasp. Ekkompreni explicitly profiles the transition from not understanding to understanding and therefore often corresponds to “realize,” “come to understand,” or “it dawned on.”

Kiam ŝi montris al mi la du datojn, mi ekkomprenis mian eraron.

When she showed me the two dates, I realized my mistake.

Nur post la dua legado mi ekkomprenis, kial la fino estas tiel ambigua.

Only after the second reading did I begin to understand why the ending is so ambiguous.

The ek- prefix contributes onset regularly. It does not make the verb past by itself; tense still comes from the final ending. Thus ekkomprenis consists of ek- + kompren- + -is. The onset can be gradual in reality, but the speaker selects the point at which comprehension emerged.

Failure versus wrong understanding

Ne kompreni means fail to understand. Miskompreni means form an understanding, but an incorrect one. This distinction changes what happened mentally.

Mi ne komprenis la demandon, do mi petis, ke ŝi ripetu ĝin.

I didn't understand the question, so I asked her to repeat it.

Mi miskomprenis la demandon kaj respondis pri tute alia temo.

I misunderstood the question and answered about a completely different topic.

English speakers sometimes use “didn't understand” for both situations. Esperanto can make the difference explicit and often should when the consequence matters.

Other productive family members

subkompreni — understand something unstated, take as implicit;
komprenigi — cause someone to understand, make clear to someone;
komprenebla / nekomprenebla — understandable / incomprehensible;
komprenema — inclined and willing to understand, understanding in attitude;
memkompreneble — self-evidently, of course;
kompreno — understanding, comprehension.

El la invito oni subkomprenis, ke ĉiu gasto mem pagos sian vojaĝon.

It was understood from the invitation that each guest would pay for their own journey.

Here the unstated content is nevertheless recoverable. Subkompreni may describe what a reader supplies implicitly; in active author-focused English, “imply” may instead require subkomprenigi or an explicit phrasing.

Komprenigi has two useful valency patterns because it causativizes a transitive verb:

Fine mi sukcesis komprenigi al li la diferencon inter la du tarifoj.

I finally managed to make him understand the difference between the two rates.

La kuracisto komprenigis al ni, ke la resaniĝo daŭros plurajn monatojn.

The doctor made it clear to us that recovery would take several months.

The content can be the direct object or clause, with the understander marked by al. PMEG also attests the pattern with the understander as direct object, especially before a ke-clause. Keeping content direct and the person in an al-phrase is often easiest to parse.

Participles and passive voice

Time relation	Active	Passive
ongoing	komprenanta — understanding	komprenata — being understood
earlier/completed	kompreninta — having understood	komprenita — understood
later/intended	komprenonta — about to understand	komprenota — to be understood

La averto estis tuj komprenita, kvankam ĝi enhavis nur tri vortojn.

The warning was understood immediately, although it contained only three words.

Ne komprenante la instrukcion, li haltigis la maŝinon kaj vokis sian kontroliston.

Not understanding the instruction, he stopped the machine and called his supervisor.

Frequency, register, and status

Kompreni is extremely frequent and neutral across all registers. Ekkompreni, miskompreni, komprenebla, and komprenigi are also ordinary; subkompreni appears especially in analytical and (academic) discussion of implicit content. Foundational norm: kompren-, the regular endings, and direct-object use are Fundamental. Accepted variation: causative komprenigi permits more than one role arrangement. Pedagogical recommendation: use the content as object and the understander with al when that makes the roles clearest. Attested usage: direct objects, factual clauses, embedded questions, and the major derivatives are all widespread.

See Ki-Correlative Embedded Questions for the internal case and role of words such as kion and kiu.

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Use ne kompreni for no successful interpretation and miskompreni for a successful but wrong interpretation.

Common Mistakes

Adding al before the thing understood

❌ Mi ne komprenas al tiu regulo.

Incorrect — the rule understood is a direct object.

✅ Mi ne komprenas tiun regulon.

I don't understand that rule.

Omitting accusative agreement

❌ Ĉu vi komprenis mia lasta mesaĝo?

Incorrect — the message is the direct object, and its possessive adjective must agree.

✅ Ĉu vi komprenis mian lastan mesaĝon?

Did you understand my last message?

Omitting ke before a proposition

❌ Mi komprenas vi bezonas pli da tempo.

Incorrect — a complete factual clause requires ke.

✅ Mi komprenas, ke vi bezonas pli da tempo.

I understand that you need more time.

Adding ke before an embedded question

❌ Mi ne komprenas, ke kial la pordo ne malfermiĝas.

Incorrect — kial itself introduces the embedded question.

✅ Mi ne komprenas, kial la pordo ne malfermiĝas.

I don't understand why the door won't open.

Key Takeaways

Kompreni is fully regular and takes the understood person, thing, or message as a direct object.
A fact follows ke; an embedded question begins directly with kial, kiel, ĉu, or another interrogative.
Ekkompreni profiles realization, while miskompreni means reach the wrong interpretation.
Komprenigi means cause understanding and can arrange the content and understander in more than one standard way.

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