Kompreneble, la vegetarano kontrolis la ingrediencojn.

Kompreneble means of course, obviously, or understandably, depending on context.

It ends in -e because -e is the Esperanto ending for an adverb. Adverbs describe a whole action or sentence, not a noun.

• komprenebla = understandable, comprehensible
• kompreneble = understandably / of course

In this sentence, Kompreneble comments on the whole statement: Of course, the vegetarian checked the ingredients.

The comma shows that kompreneble is being used as a sentence adverb, setting up the speaker’s attitude toward the whole sentence.

So:

• Kompreneble, la vegetarano kontrolis la ingrediencojn. = Of course, the vegetarian checked the ingredients.

The comma is natural here, much like in English after of course at the beginning of a sentence.

La is the Esperanto definite article, meaning the.

It appears twice because both nouns are definite:

• la vegetarano = the vegetarian
• la ingrediencojn = the ingredients

Just like in English, if both nouns are definite, both can take the.

Vegetarano means a vegetarian or the vegetarian, depending on whether la is present.

It is built like this:

• vegetar- = vegetarian-related root
• -an- / -ano often refers to a member, follower, or person associated with something
• -o = noun ending

So vegetarano is a person who is a vegetarian.

In Esperanto, every noun ends in -o.

So:

• vegetarano = vegetarian
• ingredienco = ingredient

This makes parts of speech very easy to recognize. If you see -o, you know you are looking at a noun.

Kontrolis is the past-tense form of the verb kontroli = to check or to inspect.

Esperanto verb endings are regular:

• -as = present
• -is = past
• -os = future
• -us = conditional
• -u = imperative / jussive
• -i = infinitive

So:

• kontrolas = checks / is checking
• kontrolis = checked
• kontrolos = will check

In this sentence, kontrolis means checked.

Because it is both plural and a direct object.

Breakdown:

• ingredienco = ingredient
• ingrediencoj = ingredients
• ingrediencojn = ingredientsn = the ingredients as the direct object

In Esperanto:

• -j marks plural
• -n marks the accusative, which usually shows the direct object

So la ingrediencojn means the ingredients as the thing being checked.

The -n shows which noun receives the action of the verb.

In this sentence:

• la vegetarano = the one doing the checking
• la ingrediencojn = the thing being checked

Because Esperanto marks the direct object with -n, the roles are clear even if the word order changes.

For example, both of these mean the same thing:

• La vegetarano kontrolis la ingrediencojn.
• La ingrediencojn kontrolis la vegetarano.

The -n makes it clear that the ingredients are the object, not the subject.

Yes. Esperanto word order is fairly flexible because the grammar endings show the roles of the words.

The most neutral order is:

• Kompreneble, la vegetarano kontrolis la ingrediencojn.

But you could also say:

• Kompreneble, la ingrediencojn kontrolis la vegetarano.

That might put more emphasis on the ingredients.

Even so, the usual beginner-friendly pattern is still:

subject + verb + object

So the original sentence is the most straightforward version.

It is a normal Esperanto word, even though it is clearly related to words found in several European languages, such as control or contrôle.

Esperanto often uses internationally familiar roots, then applies its own regular grammar:

• kontroli = to check
• kontrolas = checks
• kontrolis = checked
• kontrolo = a check / inspection

So even if the root looks familiar, the way it behaves is fully Esperanto.

A simple pronunciation guide is:

kom-pre-NE-ble, la ve-ge-ta-RA-no kon-TRO-lis la in-gre-di-en-TSOYN

A few helpful points:

• Esperanto stress is almost always on the second-to-last syllable.
  • komprenEble
  • vegetarAno
  • kontrolIs
  • ingrediencOjn
• c is pronounced like ts
• j sounds like English y
• oj sounds roughly like oy

So ingrediencojn is approximately in-gre-di-en-tsoyn.

No. Vegetarano refers to a person who is vegetarian.

If you want to talk about something vegetarian as an adjective, you would use:

• vegetara = vegetarian

For example:

• vegetara manĝo = a vegetarian meal

So:

• vegetarano = vegetarian person
• vegetara = vegetarian, describing something

Not always. It depends on tone and context.

Possible translations include:

• of course
• naturally
• obviously
• understandably

In this sentence, of course is probably the most natural translation, because it suggests that checking the ingredients is exactly what you would expect a vegetarian to do.