Aŭtune ni trinkas varman teon sur la balkono kaj rigardas la parkon.

Aŭtune means in autumn or during autumn.

Grammatically, it is an adverb formed from the noun aŭtuno (autumn) by changing -o to -e:

• aŭtuno = autumn
• aŭtune = in autumn / autumnally

Esperanto often uses this kind of adverb for seasons, times, and similar ideas:

• somere = in summer
• vintre = in winter
• nokte = at night

You could also say en aŭtuno, but aŭtune is very common and compact.

Esperanto has one basic present tense ending: -as.

So trinkas can mean:

• drink
• are drinking
• sometimes even do drink, depending on context

That means ni trinkas could be understood as either:

• we drink (habitually, generally), or
• we are drinking (right now)

In this sentence, because of Aŭtune, it most naturally means a habitual action: In autumn, we drink...

Because varman teon is the direct object of trinkas.

In Esperanto, the direct object usually takes -n. So:

• teo = tea
• teon = tea as a direct object

And adjectives must agree with the noun they describe. So:

• varma teo = warm tea
• varman teon = warm tea as a direct object

So both words get the matching endings:

• varma → varman
• teo → teon

For the same reason: it is the direct object of rigardas.

• parko = park
• la parko = the park
• la parkon = the park as the thing being looked at

So in:

• rigardas la parkon

the park is what we are looking at, so it gets the accusative -n.

Because sur la balkono is a prepositional phrase showing location, not a direct object.

• sur = on
• sur la balkono = on the balcony

After a preposition like sur, you normally do not add -n if you are talking about where something is.

So:

• sur la balkono = on the balcony

But Esperanto can use -n after a preposition to show movement toward a place:

• sur la balkonon = onto the balcony

So the difference is:

• sur la balkono = location
• sur la balkonon = motion toward that location

La is the definite article, like English the.

So:

• la balkono = the balcony
• la parko = the park

Esperanto uses la when the speaker means a specific thing that is identifiable in context.

In a sentence like this, the balcony and the park are probably understood as the ones relevant to the speakers, so la sounds natural.

Also, Esperanto has:

• la = the
• no word for a/an

So teon here simply means tea, not necessarily the tea or a tea unless context makes that clear.

Yes. Esperanto word order is fairly flexible, because endings like -n help show what each word is doing.

The given sentence is very natural:

• Aŭtune ni trinkas varman teon sur la balkono kaj rigardas la parkon.

But other orders are possible for emphasis, for example:

• Ni aŭtune trinkas varman teon sur la balkono kaj rigardas la parkon.
• Sur la balkono ni trinkas varman teon kaj rigardas la parkon.

Still, the original version is a good neutral choice. Putting Aŭtune first nicely sets the scene.

Because the same subject, ni, applies to both verbs.

So:

• ni trinkas ... kaj rigardas ...

means:

• we drink ... and look at ...

Esperanto, like English, often leaves the subject unspoken the second time when it is clearly the same.

You could repeat it:

• Aŭtune ni trinkas varman teon sur la balkono kaj ni rigardas la parkon.

But that is usually less natural unless you want extra emphasis.

Very close, yes.

In Esperanto:

• rigardi usually takes a direct object

So you say:

• rigardi la parkon = to look at the park

English needs at, but Esperanto does not here. That is why la parkon gets -n as a direct object.

This is worth remembering, because Esperanto verbs do not always match English prepositions exactly.