La firmao estas eksterlanda.

La is the definite article, meaning the.

So:

• la firmao = the company
• firmao = a company or just company, depending on context

Esperanto has only one article, la, and it does not change for gender, number, or case in normal use.

Also, Esperanto has no separate word for a/an. So if you want to say a company is foreign, you could simply say:

• Firmao estas eksterlanda.

But in your sentence, la makes it specific: the company.

In Esperanto, all nouns end in -o.

So firmao is a noun because of the -o ending.

This is one of the most important patterns in Esperanto:

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

That means even if you do not know a word yet, the ending tells you what kind of word it is.

Estas is the present-tense form of esti, which means to be.

So:

• mi estas = I am
• vi estas = you are
• li/ŝi/ĝi estas = he/she/it is
• ili estas = they are

Unlike English, Esperanto does not change the present-tense verb depending on the subject. It is always estas.

So:

• La firmao estas eksterlanda. = The company is foreign.

Because eksterlanda is an adjective, and all Esperanto adjectives end in -a.

Here it describes the subject:

• firmao = company
• eksterlanda = foreign

So the structure is:

• La firmao = the company
• estas = is
• eksterlanda = foreign

This is very regular in Esperanto: if a word ends in -a, it is an adjective.

Yes. In Esperanto, adjectives agree with the nouns they describe in number and case.

In this sentence, firmao is:

• singular
• not accusative

So the adjective stays in its basic form:

• firmao
• eksterlanda

If the noun were plural, the adjective would also become plural:

• La firmaoj estas eksterlandaj. = The companies are foreign.

If there were an accusative -n, the adjective would match that too.

Because eksterlanda is not a direct object here.

In La firmao estas eksterlanda, the word eksterlanda is a predicate adjective after estas. It describes the subject; it is not something being acted on.

So there is no accusative ending:

• La firmao estas eksterlanda. ✓

Compare that with a direct object:

• Mi vidas la firmaon. = I see the company.

There, firmaon gets -n because it is the object.

Because here the adjective is part of the predicate:

• La firmao estas eksterlanda.
• literally: The company is foreign.

After estas, you normally put the thing that describes or identifies the subject.

But if you want the adjective directly before the noun, that is also possible in a different structure:

• La eksterlanda firmao = the foreign company

So:

• La firmao estas eksterlanda. = The company is foreign.
• La eksterlanda firmao = The foreign company

These are related, but they are not the same sentence structure.

It is made from smaller meaningful parts:

• ekster = outside
• land = land, country
• -a = adjective ending

So eksterlanda literally suggests something like outside-country-related, which becomes foreign.

This is a very Esperanto-like feature: many words are built from pieces in a transparent way.

Related words include:

• lando = country
• eksterlando = abroad, foreign country/countries
• eksterlandano = foreigner
• eksterlande = abroad

Yes, that is the basic idea.

Eksterlanda usually means foreign, from abroad, or from another country.

In practice, the exact English translation depends on context. For a company, it could mean:

• foreign
• based abroad
• from another country

So even if the displayed meaning is already given, it is useful to know that eksterlanda often has this broader sense of belonging to or coming from outside the country being discussed.

A simple guide:

• La = lah
• firmao = feer-MAH-oh
• estas = ES-tahs
• eksterlanda = eks-ter-LAHN-dah

A key rule in Esperanto is: stress is always on the second-to-last syllable.

So the stressed syllables are:

• firMAo
• EStas
• eksterLANda

That regular stress pattern makes pronunciation much easier than in English.

The normal order is:

• La firmao estas eksterlanda.

Esperanto word order is more flexible than English, but this is the most neutral and natural version.

Because Esperanto uses endings to show grammar, some rearrangement is possible for emphasis. Still, for learners, the safest pattern is:

subject + verb + predicate adjective

So this sentence is a very standard example of that pattern.