La intrigo estas interesa.

La is the definite article, meaning the.

So la intrigo means the plot.

A useful point for English speakers: Esperanto has la, but it does not have a separate word for a/an. So:

• la intrigo = the plot
• intrigo = a plot or just plot, depending on context

In Esperanto, nouns normally end in -o.

So intrigo is a noun because of that -o ending. This is one of the most basic and helpful patterns in the language:

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

That means even if you do not know the 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 estas means is / am / are, depending on the subject.

Examples:

• Mi estas = I am
• Vi estas = you are
• La intrigo estas = the plot is

Esperanto verbs do not change form for different persons the way English verbs do. The same estas works with all subjects.

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

So:

• interesa = interesting

This is another very regular Esperanto pattern. If you see -a, you can usually expect an adjective.

Because it is describing a singular noun and there is no accusative ending here.

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

Here:

• intrigo is singular
• it is not accusative
• so the adjective is also singular and non-accusative: interesa

Compare:

• La intrigo estas interesa. = singular
• La intrigoj estas interesaj. = plural

Also, after estas, the adjective is a predicate adjective, so it normally does not take -n.

Because there is no direct object here.

This sentence has:

• a subject: la intrigo
• a verb: estas
• a predicate adjective: interesa

The verb esti does not take a direct object in this kind of sentence. It links the subject to a description. So you do not use the accusative -n on intrigo or interesa here.

It follows a very common pattern:

subject + esti + adjective

So here:

• La intrigo = subject
• estas = linking verb
• interesa = predicate adjective

In English, this is the same basic structure as:

• The plot is interesting.
• The book is long.
• The house is old.

This is one of the easiest Esperanto sentence patterns to recognize.

Yes, Esperanto word order is fairly flexible, although La intrigo estas interesa is the most neutral and natural order.

You might also see:

• Interesa estas la intrigo.

That can sound more literary or emphasize interesa.

Still, for learners, the standard order is best:

• subject + verb + complement

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

So:

• intrigo → in-TRI-go
• estas → ES-tas
• interesa → in-te-RE-sa

That gives the full sentence something like:

la in-TRI-go ES-tas in-te-RE-sa

This regular stress pattern is one of the nicest features of Esperanto.

Here it means interesting.

So La intrigo estas interesa means that the plot causes interest.

For English speakers, this is worth noticing because interesting and interested are different ideas. In Esperanto, interesa corresponds to interesting, not interested.

Often it does mean the plot of a story, book, film, or play. It can also mean an intrigue or scheme, depending on context.

So the exact English word may vary a little, but the Esperanto grammar in the sentence stays the same:

• La intrigo = the plot / the intrigue
• estas interesa = is interesting