La teknikisto instalos la modemon.

In Esperanto, -o marks a noun. So teknikisto is a noun meaning technician.

This is one of the most basic and regular endings in the language:

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

So if you see teknikisto, you can immediately tell it is a thing or person, not an action or description.

The suffix -isto usually means a person զբաղված in a profession, activity, or role. In many cases, it corresponds to English words like -ist, -er, or professional/person associated with something.

So:

• tekniko = technique / technology / technical practice
• teknikisto = technician, technical worker, specialist

Other examples:

• piano → pianisto = pianist
• arto → artisto = artist
• scienco → sciencisto = scientist

This is one of the useful things about Esperanto: once you know the suffix, you can often work out the meaning of new words.

La means the. Esperanto uses the same definite article for all nouns:

• no gender distinction
• no number distinction
• no case distinction in form

So both la teknikisto and la modemon use la because both mean the technician and the modem.

Unlike English, Esperanto has only one definite article: la. There is no separate word for a or an. If you want an indefinite meaning, you usually just leave the article out.

For example:

• teknikisto instalos modemon = a technician will install a modem / technician(s) will install a modem, depending on context
• la teknikisto instalos la modemon = the technician will install the modem

The ending -os marks the future tense in Esperanto.

So:

• instali = to install
• instalas = installs / is installing
• instalis = installed
• instalos = will install

Esperanto verbs are very regular. The tense ending does not change depending on the subject:

• mi instalos = I will install
• vi instalos = you will install
• li instalos = he will install
• la teknikisto instalos = the technician will install

This regularity is much simpler than English verb conjugation.

The -n ending marks the direct object. That means it shows which noun is directly affected by the action.

In this sentence:

• la teknikisto = the doer of the action
• instalos = will install
• la modemon = the thing being installed

So modemo becomes modemon because it is the direct object.

This is called the accusative ending.

A useful way to think about it:

• Who is doing the action? → la teknikisto
• What is being installed? → la modemon

Yes, to some extent. Because -n clearly marks the direct object, Esperanto word order is more flexible than English word order.

These mean essentially the same thing:

• La teknikisto instalos la modemon.
• La modemon instalos la teknikisto.

In both sentences, la modemon is still the object because of -n.

However, the most neutral and common order is still:

subject + verb + object

So for a learner, La teknikisto instalos la modemon is the safest and most natural pattern to use.

Yes. Modemo is a borrowed or international-style word adapted to Esperanto spelling and grammar.

Esperanto often takes internationally familiar roots and gives them regular endings:

• modem → modemo
• telefono = telephone
• komputilo = computer
• radio = radio

Once the word becomes an Esperanto noun, it behaves like any other noun:

• modemo = a modem
• modemoj = modems
• modemon = a modem / the modem as direct object
• modemojn = modems as direct object

A rough pronunciation guide is:

La tehk-nee-KEE-sto een-stah-LOHS la moh-deh-MON

A few helpful points:

• teknikisto has stress on kis: tek-ni-KIS-to
• instalos has stress on ta: in-sta-LOS
• modemon has stress on de: mo-de-MON

Esperanto stress is very regular: it normally falls on the second-to-last syllable.

Also:

• c is always like ts
• j sounds like English y
• e is like e in met
• o is a pure o sound

Because Esperanto usually expresses tense directly in the verb ending rather than with an extra helper word.

In English:

• will install

In Esperanto:

• instalos

So the future meaning is built into the verb itself.

This is one reason Esperanto grammar feels compact and regular. Instead of memorizing lots of helping verbs, you mainly learn a small set of endings:

• -as = present
• -is = past
• -os = future
• -us = conditional
• -u = command / volitive
• -i = infinitive

It most naturally means a simple future: The technician will install the modem.

In many contexts, English future expressions overlap, so depending on the situation it could also be translated naturally as:

• The technician is going to install the modem
• The technician will be installing the modem

But grammatically, instalos is just the plain future tense. It does not by itself add the special nuance that English sometimes gives with going to.

In Esperanto, plural nouns take -j.

So:

• teknikisto = technician
• teknikistoj = technicians
• modemo = modem
• modemoj = modems

If the direct object is plural, it takes both -j and -n:

• La teknikistoj instalos la modemojn. = The technicians will install the modems.

So the order of endings is:

noun + plural -j + accusative -n

That is why modemojn ends in -ojn.