Esperanto estas internacia lingvo.

A simple English-friendly pronunciation is:

• Esperanto ≈ es-peh-RAHN-to
• estas ≈ ES-tahs
• internacia ≈ in-ter-na-TSEE-ah
• lingvo ≈ LEEN-gvo

A few useful pronunciation points:

• Stress is usually on the second-to-last syllable in Esperanto:
  • Esperanto
  • estas
  • internacia
  • lingvo
• c is pronounced like ts, not like English k or s.
• g in lingvo is always a hard g, as in go.
• Vowels are pronounced clearly and consistently, not reduced as often happens in English.

Yes. Estas is the present-tense form of the verb esti, meaning 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 verb for different persons in the present tense. It is always estas.

Esperanto has no indefinite article. English says a language or an international language, but Esperanto simply says lingvo or internacia lingvo.

So:

• lingvo = a language / language
• internacia lingvo = an international language

Esperanto does have a definite article: la, meaning the.

So:

• Esperanto estas internacia lingvo = Esperanto is an international language
• Esperanto estas la internacia lingvo = Esperanto is the international language

The second sentence is much stronger and more specific.

These endings show the part of speech:

• -o = noun
• -a = adjective

So in this sentence:

• lingvo = language → a noun
• internacia = international → an adjective

This is one of the most regular features of Esperanto. You can often recognize a word’s role just by its ending.

In Esperanto, adjectives can come before or after the noun, though before is often more common and neutral.

So both are possible:

• internacia lingvo
• lingvo internacia

Both mean international language.

However, internacia lingvo is the more natural choice in ordinary usage here.

Yes. Adjectives agree with the nouns they describe in number and case.

In this sentence:

• internacia is singular
• lingvo is singular

So they match.

Examples:

• internacia lingvo = an international language
• internaciaj lingvoj = international languages

If the noun were plural, the adjective would also become plural with -j.

Because this sentence uses estas, which links the subject to a description, not to a direct object.

In Esperanto estas internacia lingvo:

• Esperanto is the subject
• internacia lingvo describes what Esperanto is

After esti (to be), Esperanto normally does not use the accusative -n.

So lingvo stays lingvo, not lingvon.

Not completely. Esperanto is a proper name, so it behaves as a name rather than as a regular noun built from the normal word-ending system.

That said, it happens to end in -o, which looks like a normal noun ending. Many language names in Esperanto do this:

• la angla = English
• la franca = French
• Esperanto = Esperanto

So although Esperanto looks regular, learners should mainly treat it as the name of the language.

Because Esperanto is a proper noun, the name of a specific language.

In Esperanto, as in English:

• proper names are capitalized
• ordinary nouns and adjectives are not capitalized unless they begin a sentence

So:

• Esperanto = capitalized
• internacia lingvo = not capitalized

Yes. That is grammatical.

Esperanto allows fairly flexible word order, especially with adjectives. So these are both possible:

• Esperanto estas internacia lingvo
• Esperanto estas lingvo internacia

They mean the same thing, but the first version is more standard and natural for most learners to use.

The pattern is:

subject + verb + complement

Here:

• Esperanto = subject
• estas = verb
• internacia lingvo = subject complement / predicate noun phrase

This is similar to English X is Y.

So the sentence structure is very straightforward and is a good example of a basic Esperanto statement.