La inspektoro kontrolas la dokumenton.

La is the Esperanto definite article, meaning the. It does not change for gender, number, or case, so the same form is used everywhere.

It appears twice because both nouns are definite:

• la inspektoro = the inspector
• la dokumenton = the document

Esperanto has no indefinite article, so there is no separate word for a or an.

In Esperanto, nouns end in -o. So inspektoro is a noun meaning inspector.

This is one of the most basic and useful patterns in Esperanto:

• -o = noun
• -a = adjective
• -e = adverb
• -i = infinitive verb

Because of this system, word classes are very easy to recognize.

The ending -as marks the present tense in Esperanto.

So:

• kontroli = to check / to inspect
• kontrolas = checks / is checking / does check

Esperanto present tense is simpler than English. One form can cover several English possibilities depending on context:

• The inspector checks the document
• The inspector is checking the document

The -n ending marks the direct object. That is the thing directly affected by the action.

In this sentence:

• la inspektoro is the one doing the action
• la dokumenton is the thing being checked

So dokumento becomes dokumenton because it is the direct object.

This is called the accusative ending. It is one of the most important features of Esperanto grammar.

Because la never changes. It always stays la.

In Esperanto:

• nouns can change form, such as dokumento → dokumenton
• adjectives can also change to match nouns
• but la stays the same in every situation

So la dokumenton is correct, not some altered form of la.

No, Esperanto word order is fairly flexible, largely because the -n ending shows which noun is the object.

So these can mean the same thing:

• La inspektoro kontrolas la dokumenton.
• La dokumenton kontrolas la inspektoro.

Both mean that the inspector is checking the document, because dokumenton is marked as the object.

However, subject–verb–object order is the most neutral and common, so the original sentence is the most straightforward version.

Not necessarily. -as simply marks the present tense, but English present tense has several uses, so the exact nuance depends on context.

It could mean:

• the inspector is checking the document right now
• the inspector checks the document as a regular duty
• the inspector checks documents in general

Without more context, Esperanto leaves that open, just as English sometimes does.

Yes. Esperanto uses many roots that are internationally recognizable, especially from European languages. That is very normal.

Here:

• inspektoro resembles English inspector
• dokumento resembles English document
• kontroli resembles control/check/inspect-type vocabulary found across European languages

Even when a word looks familiar, its Esperanto grammar is still completely regular:

• noun ending -o
• present tense -as
• object ending -n

A simple pronunciation guide is:

La inspektoro kontrolas la dokumenton
lah in-spek-TO-ro kon-TRO-las lah do-ku-MEN-ton

A few helpful points:

• Esperanto stress is almost always on the second-to-last syllable
• every letter is pronounced consistently
• o is like the o in for or a pure o sound, not reduced
• a is like ah
• e is like eh

So the stressed syllables are:

• inspekTOro
• konTROlas
• dokuMENton

Yes, in standard Esperanto it would be wrong in this sentence.

Because the document is the direct object of kontrolas, it needs the accusative -n:

• correct: la dokumenton
• not correct here: la dokumento

If you removed the -n, the sentence would no longer clearly mark the document as the object.