La teknikisto kontrolis la uzantnomon.

The final -n marks the direct object in Esperanto.

In this sentence:

• La teknikisto = the technician, the person doing the action
• kontrolis = checked
• la uzantnomon = the username, the thing being checked

So uzantnomo becomes uzantnomon because it receives the action of the verb.

A very literal breakdown is:

• La teknikisto → subject
• kontrolis → verb
• la uzantnomon → object

This -n ending is one of the most important grammar markers in Esperanto.

La is the Esperanto definite article, meaning the.

So:

• la teknikisto = the technician
• la uzantnomon = the username

Unlike English, Esperanto has only one definite article: la. It does not change for:

• singular or plural
• masculine or feminine
• subject or object

So you always use la in the same form.

Because -is marks the past tense in Esperanto.

Verb endings are very 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 your sentence, the action happened in the past, so kontrolis is correct.

The suffix -ist- usually means a person associated with a profession, activity, or system.

So:

• tekniko = technique / technology-related skill
• teknikisto = technician

Other examples:

• kuracisto = doctor
• pianisto = pianist
• dentisto = dentist

The final -o shows that the whole word is a noun.

Because Esperanto very often forms compound words by joining roots together into a single word.

Here:

• uzant- = user / using person
• nomo = name

So uzantnomo literally means something like user-name, or username.

This is very normal in Esperanto. Compounds are common and usually quite logical.

In this sentence, uzantnomo then gets the object ending -n:

• uzantnomo → username
• uzantnomon → username as the direct object

Uzant- comes from the verb uzi, meaning to use.

From uzi, you can form:

• uzanto = user
• uzanta = using
• uzantnomo = username

So uzant- is based on the idea of someone who uses.

This is an example of Esperanto word-building: once you know the root and the endings, many words become easy to understand.

Because in Esperanto, the -n ending usually marks the direct object, not the subject.

So:

• La teknikisto is the subject, so it stays teknikisto
• la uzantnomon is the object, so it becomes uzantnomon

This helps make sentence roles clear even if the word order changes.

For example, these mean the same thing:

• La teknikisto kontrolis la uzantnomon.
• La uzantnomon kontrolis la teknikisto.

The second sounds less neutral, but the meaning is still clear because of -n.

Not as strictly as in English.

Because Esperanto uses endings like -n to mark the direct object, word order is more flexible. However, the most neutral and common order is still:

subject + verb + object

So your sentence is in the most standard order:

• La teknikisto → subject
• kontrolis → verb
• la uzantnomon → object

Other orders are possible, but they may sound more literary, emphatic, or unusual depending on context.

Because -o is the standard noun ending in Esperanto.

So:

• teknikisto is a noun
• uzantnomo is a noun

This is one of the most regular features of Esperanto:

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

That means when you see -o, you can immediately recognize the word as a noun.

Yes. Plural nouns in Esperanto take -j, and if they are also direct objects, they take both -j and -n.

So:

• la uzantnomo = the username
• la uzantnomoj = the usernames
• la uzantnomojn = the usernames as a direct object

Example:

• La teknikisto kontrolis la uzantnomojn.
• The technician checked the usernames.

The order of endings is important: plural -j comes before object -n.

Esperanto pronunciation is very regular.

A rough English-style guide:

• La → lah
• teknikisto → tek-nee-KEES-to
• kontrolis → kon-TRO-lis
• la → lah
• uzantnomon → oo-ZANT-NO-mon

A few useful pronunciation notes:

• a is like a in father
• i is like ee in see
• o is like o in for but usually shorter and cleaner
• stress is almost always on the second-to-last syllable

So the stressed syllables are:

• tek-ni-KIS-to
• kon-TRO-lis
• u-zant-NO-mon

Not exactly. In Esperanto, kontroli usually means to check, to inspect, or to verify.

So in this sentence, kontrolis means the technician checked the username.

This is one of those words that looks familiar to an English speaker but does not always match perfectly in meaning. In many contexts, Esperanto kontroli is closer to:

• check
• inspect
• verify

rather than control in the sense of govern or direct.

Grammatically, you can omit la if you do not mean the specifically, but it changes the feel of the sentence.

Compare:

• La teknikisto kontrolis la uzantnomon. = The technician checked the username.
• Teknikisto kontrolis uzantnomon. = A technician checked a username or a less specific statement

Esperanto has no separate word for a/an, so bare nouns often do that job.

So if the sentence is about a specific technician and a specific username, keeping la is the natural choice.