Se la lampo ne funkcius, ni sidus en la salono kaj aŭskultus la venton.

The ending -us is the Esperanto conditional mood. It usually corresponds to English would.

So in this sentence:

• funkcius = would function / would work
• sidus = would sit / would be sitting
• aŭskultus = would listen

This tells you the whole sentence is talking about a hypothetical situation, not a real event that is definitely happening.

That is a very common question. Esperanto and English handle this differently.

In Esperanto, when the situation is hypothetical, it is normal to use -us in both the if-clause and the main clause:

• Se la lampo ne funkcius, ni sidus...

In natural English, we usually say:

• If the lamp didn’t work, we would sit...

So although the Esperanto structure may look strange from an English point of view, it is standard Esperanto grammar.

Se means if.

It introduces the condition:

• Se la lampo ne funkcius = If the lamp did not work / If the lamp weren’t working

So se sets up the hypothetical situation, and the rest of the sentence gives the result.

Ne is the normal Esperanto word for not. It usually goes directly before the word it negates.

Here it negates the verb:

• ne funkcius = would not work

So:

• Se la lampo ne funkcius = If the lamp would not work / If the lamp didn’t work

That placement is very regular in Esperanto and much simpler than English negation in many cases.

The dictionary form is funkcii, which means to function or to work.

You can break it down like this:

• funkci- = the word root
• -i = infinitive, to ...
• -us = conditional, would ...

So:

• funkcii = to function
• funkcius = would function

The dictionary form is sidi, meaning to sit or to be seated.

So:

• sidi = to sit
• sidus = would sit / would be sitting

In this sentence, sidus does not necessarily mean the action of lowering yourself into a chair. It often just means would be seated or would remain sitting.

Because en la salono shows location, not movement.

• en la salono = in the living room / in the salon

In Esperanto, -n is often used after a preposition when there is motion toward something. But here there is no movement; the people are simply located there.

Compare:

• Ni sidus en la salono. = We would sit in the living room.
• Ni irus en la salonon. = We would go into the living room.

So salono has no -n because it is just the place where they would be.

Because venton is the direct object of aŭskultus.

• aŭskulti ion = to listen to something
• la vento = the wind
• la venton = the wind as a direct object

So:

• aŭskultus la venton = would listen to the wind

This is a good example of the Esperanto accusative ending -n.

Because Esperanto aŭskulti takes a direct object.

English says:

• listen to the wind

Esperanto says:

• aŭskulti la venton

So even though English uses to, Esperanto does not need a preposition here.

This is something learners just memorize with the verb:

• aŭskulti muzikon = to listen to music
• aŭskulti la instruiston = to listen to the teacher
• aŭskulti la venton = to listen to the wind

La is the definite article, meaning the.

So:

• la lampo = the lamp

Esperanto uses la when the speaker has a particular thing in mind, just like English the. In this sentence, it sounds like a specific lamp is being referred to, not lamps in general.

Kaj means and.

It joins the two verbs that have the same subject ni:

• ni sidus en la salono
• kaj aŭskultus la venton

So the meaning is:

• we would sit in the living room and listen to the wind

Because the subject is the same for both verbs, Esperanto does not repeat ni.

Not usually. In Esperanto, salono generally means a living room, sitting room, or lounge-like room in a house.

For most learners, in this sentence the most natural translation is:

• in the living room

So even if the form looks like English salon, the everyday meaning here is closer to living room.

It is a hypothetical situation, so -us does not directly mark a specific time the way English past or future forms do.

Depending on context, it could mean something like:

• If the lamp didn’t work, we would sit in the living room and listen to the wind.
• If the lamp were not working, we would sit in the living room and listen to the wind.

So the main idea is not time, but unreality / possibility / imagination.

In aŭskultus, the aŭ is a diphthong, roughly like ow in English cow.

A simple pronunciation guide:

• aŭs-KUL-tus

Stress in Esperanto is always on the second-to-last syllable, so here the stress is on KUL.

The same stress rule works for the whole sentence:

• Se la LAM-po ne funk-CI-us, ni SI-dus en la sa-LON-o kaj aŭs-KUL-tus la VEN-ton.

You can, but it changes the meaning.

• Se la lampo ne funkcius... = If the lamp didn’t work / were not working...
  This is hypothetical.

• Se la lampo ne funkciis... = If the lamp didn’t work / didn’t function...
  This sounds like a statement about a real past situation.

So -us is important here because it tells you the condition is imagined or unreal, not simply past.

Here are the main words in dictionary form:

• se = if
• la = the
• lampo = lamp
• ne = not
• funkcii = to function, to work
• ni = we
• sidi = to sit
• en = in
• salono = living room, salon
• kaj = and
• aŭskulti = to listen to
• vento = wind

Seeing the sentence in roots can make it easier to understand how the endings work.