En aŭtuno miaj gepatroj promenas en la arbaro kaj aŭskultas la venton.

Yes. En aŭtuno literally means in autumn.

In Esperanto, en is often used for:

• place: en la arbaro = in the forest
• time periods / seasons: en aŭtuno = in autumn, en somero = in summer

So this is a very normal way to say when something happens.

Because Esperanto usually does not use la with seasons in a general sense.

So:

• en aŭtuno = in autumn / in the autumn in a general seasonal sense

You would use la only if you were talking about a specific autumn already identified in context:

• en la aŭtuno de 2023 = in the autumn of 2023

Here it means autumn in general, so en aŭtuno is natural.

Miaj means my, but it has the plural ending -j because it describes a plural noun: gepatroj.

In Esperanto, adjectives and similar words agree with the noun they modify in:

• number: singular or plural
• case: nominative or accusative

So:

• mia patro = my father
• miaj gepatroj = my parents

Both miaj and gepatroj are plural, so both have -j.

Gepatroj means parents.

This word is built like this:

• patro = father
• patrino = mother
• gepatroj = parents, literally a mixed-sex parental pair/group

The prefix ge- refers to both sexes together. With family words, it is very common:

• gefratoj = brothers and sisters / siblings
• geavoj = grandparents
• gepatroj = parents

So patroj would mean fathers, not parents.

Because -as is the Esperanto present-tense verb ending.

So:

• promeni = to walk
• promenas = walk / are walking
• aŭskulti = to listen
• aŭskultas = listen / are listening

Esperanto verbs do not change according to the subject:

• mi promenas
• vi promenas
• ili promenas

The ending stays -as for all persons.

In this sentence, the present tense can express a habitual action:

• In autumn my parents walk in the forest and listen to the wind.

Most likely it means a habitual or general action: they do this in autumn as a regular thing.

In Esperanto, the present tense -as can mean:

• something happening now
• something that usually happens
• something generally true

Because the sentence begins with En aŭtuno, it strongly suggests a repeated seasonal habit:

• In autumn, my parents walk in the forest and listen to the wind.

Because en la arbaro describes location, not motion into a place.

Compare:

• en la arbaro = in the forest (already there; location)
• en la arbaron = into the forest (movement toward the inside)

Here promenas en la arbaro means they are walking in the forest.

If the idea were They walk into the forest, Esperanto could use:

• ili promenas en la arbaron or more clearly
• ili promenas en la arbaron / ili iras en la arbaron

So the lack of -n on arbaro shows place, not direction.

Because la venton is the direct object of aŭskultas.

They are listening to what?

• la venton = the wind

In Esperanto, direct objects take -n:

• Mi vidas la arbon. = I see the tree.
• Ili aŭskultas la venton. = They listen to the wind.

That -n ending is called the accusative ending.

Because la is the definite article, meaning the.

So:

• la arbaro = the forest
• la vento / la venton = the wind

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

In this sentence:

• en la arbaro = in the forest
• la venton = the wind

It sounds natural because these are understood as specific things in the situation: the forest they walk in, and the wind they hear.

This is an important distinction.

• aŭdi = to hear
  This is passive: sound reaches your ears.
• aŭskulti = to listen
  This is active: you pay attention to sound.

So:

• Mi aŭdas la venton. = I hear the wind.
• Mi aŭskultas la venton. = I am listening to the wind.

In your sentence, aŭskultas is used because the parents are actively listening to the wind.

Yes. Kaj means and, and it connects the two verbs that share the same subject.

The subject is:

• miaj gepatroj

The two actions are:

• promenas
• aŭskultas

So the structure is:

• My parents walk in the forest and listen to the wind.

This is completely normal in Esperanto, just as in English.

Yes, Esperanto word order is fairly flexible because endings show the grammar clearly.

The original sentence:

• En aŭtuno miaj gepatroj promenas en la arbaro kaj aŭskultas la venton.

Possible variations include:

• Miaj gepatroj promenas en la arbaro kaj aŭskultas la venton en aŭtuno.
• En la arbaro miaj gepatroj promenas kaj aŭskultas la venton en aŭtuno.

However, the original order is very natural because it starts with the time expression En aŭtuno, which sets the scene nicely.

In Esperanto, aŭ is a diphthong, pronounced roughly like ow in cow.

So:

• aŭtuno sounds roughly like ow-too-no
• aŭskultas begins with the same aŭ sound

The letter ŭ is not a full vowel by itself here; it combines with the previous vowel to form one sound: aŭ.

This is one of the common patterns learners notice early, and it appears in several frequent words.