La subtitoloj estas klaraj.

In Esperanto, -o marks a noun, and -j marks the plural.

So:

• subtitolo = subtitle
• subtitoloj = subtitles

The ending -oj therefore means plural noun.

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

• klara = clear
• klaraj = clear (plural)

Since subtitoloj is plural, the adjective must also be plural:

• La subtitoloj estas klaraj. = The subtitles are clear.

If the noun were singular, you would say:

• La subtitolo estas klara.

La is the Esperanto definite article, meaning the.

So:

• la subtitoloj = the subtitles

Unlike English, Esperanto has only one article form:

• no a/an
• only la for the

It does not change for gender, number, or case.

Estas is the present-tense form of the verb esti, meaning to be.

So:

• estas = are / is / am, depending on the subject

In this sentence:

• La subtitoloj estas klaraj.
• literally: The subtitles are clear.

Esperanto verbs do not change according to person or number, so estas is always the present tense:

• mi estas = I am
• li estas = he is
• ili estas = they are

Esperanto verbs are much simpler than English verbs. They do not change depending on the subject.

So all of these use estas:

• mi estas = I am
• vi estas = you are
• ĝi estas = it is
• ili estas = they are

That means you do not need to memorize separate present-tense forms like am / is / are.

It is built in a very international-looking way and is easy to recognize if you know English or other European languages.

You can think of it as:

• sub- = under, below
• titolo = title

So subtitolo literally suggests something like under-title, which matches the idea of a subtitle.

This is common in Esperanto: many words are built from recognizable roots and prefixes.

A helpful rough pronunciation is:

• subtitoloj ≈ soob-tee-TOH-loy
• klaraj ≈ KLAH-rye

A few useful pronunciation points:

• Esperanto stress is usually on the second-to-last syllable
  • sub-ti-TO-loj
  • KLA-raj
• j is pronounced like English y
  • so -aj sounds roughly like eye
  • -oj sounds roughly like oy

So the sentence sounds approximately like:

• la soob-tee-TOH-loy ES-tahs KLAH-rye

Because this sentence uses a linking verb:

• La subtitoloj = the subtitles
• estas = are
• klaraj = clear

So klaraj is a predicate adjective, not an adjective placed directly before the noun.

This is similar to English:

• The subtitles are clear.

If you wanted the adjective directly next to the noun, you could say:

• la klaraj subtitoloj = the clear subtitles

Both are correct, but they do slightly different jobs in the sentence.

Yes, Esperanto word order is fairly flexible, because endings show what the words are doing.

The normal, neutral order here is:

• La subtitoloj estas klaraj.

You might also see:

• Klaraj estas la subtitoloj.

That could sound more emphatic, like Clear are the subtitles or The subtitles are what’s clear.

For everyday use, the original order is the most natural.

No. That would be incorrect, because klara is singular but subtitoloj is plural.

You need agreement:

• singular: La subtitolo estas klara.
• plural: La subtitoloj estas klaraj.

So whenever an adjective describes a plural noun, add -j to the adjective too.

Yes, sometimes la can be omitted if you mean subtitles in a general sense rather than a specific set.

Compare:

• Subtitoloj estas klaraj. = Subtitles are clear. / Subtitles are clear in general.
• La subtitoloj estas klaraj. = The subtitles are clear. / a particular set of subtitles is clear.

So la makes the noun phrase definite and specific.

The singular version is:

• La subtitolo estas klara.

Changes:

• subtitoloj → subtitolo
• klaraj → klara

That shows the same agreement pattern in singular form.