Post la laboro mi pasas ĉe la vendejo, ĉar mi bezonas novan kusenon por la sofo.

Post is a preposition meaning after.

So post la laboro means after work or more literally after the work.

Poste is an adverb meaning afterward / later. It does not directly take a noun phrase.

• post la laboro = after work
• poste = afterward, later

So in this sentence, post is needed because it introduces la laboro.

Esperanto often uses la when the thing is understood as a specific one in context.

Here, la laboro means something like the workday / my work / the work I have just finished. Even though English usually says simply after work, Esperanto commonly uses la in this kind of situation.

So post la laboro is a natural way to say after work.

This means I pass by the store or I stop by the store, depending on context.

The key part is pasi ĉe:

• pasi = to pass
• ĉe = at, by, near

So pasi ĉe la vendejo literally means to pass by the store / to go by the store.

In natural English, if the meaning is that you are going there briefly on the way somewhere, stop by the store is often the best translation.

Because the sentence uses the expression pasi ĉe.

These prepositions give different ideas:

• ĉe la vendejo = by/at the store
• al la vendejo = to the store
• en la vendejo = in the store
• en la vendejon = into the store

So:

• mi pasas ĉe la vendejo = I pass by / stop by the store
• mi iras al la vendejo = I am going to the store
• mi estas en la vendejo = I am in the store

The sentence is built around pasi ĉe, not around iri.

Vendejo means store, shop, place of selling.

It is made from:

• vend- = sell
• -ej- = place
• -o = noun ending

So vendejo literally means a place for selling.

This is a very typical Esperanto word-building pattern.

Because ĉar introduces a subordinate clause: ĉar mi bezonas novan kusenon por la sofo.

In Esperanto, it is normal to separate clauses with a comma, especially when a conjunction like ĉar introduces the reason.

So the comma works much like in English:

• ..., ĉar ... = ..., because ...

Yes, ĉar means because and introduces a reason.

In this sentence:

• ĉar mi bezonas novan kusenon = because I need a new cushion

It is one of the most common conjunctions in Esperanto.

Because novan kusenon is the direct object of bezonas.

• mi bezonas kion? = what do I need?
• novan kusenon = a new cushion

In Esperanto, the direct object takes -n. Adjectives must agree with the nouns they describe, so both words get -n:

• kuseno → kusenon
• nova → novan

This is why you see:

• novan kusenon

Kuseno can mean pillow or cushion, depending on context.

Because the sentence says por la sofo (for the sofa), the natural meaning here is cushion rather than a bed pillow.

So in this sentence, novan kusenon por la sofo is best understood as a new cushion for the sofa.

Por means for in the sense of intended for / meant for / used for.

So:

• kuseno por la sofo = a cushion for the sofa

That means the cushion is meant to go on that sofa.

If you said de la sofo, that would suggest of the sofa or from the sofa, which is a different idea.

Here la sofo refers to a specific sofa, presumably the one at the speaker’s home.

Esperanto often uses la when the thing is definite from context, even if English might sometimes leave it out in a more general phrase.

So por la sofo means for the sofa = the sofa we are talking about.

Yes. Esperanto present tense often covers ideas that English can express in several ways.

• mi pasas ĉe la vendejo can mean something like:
  • I stop by the store
  • I’m stopping by the store
  • in some contexts even I stop by the store after work as a habitual action

Esperanto uses -as for the present, but the exact time sense depends a lot on context.

If the speaker wanted to make the future explicit, they could say:

• Post la laboro mi pasos ĉe la vendejo... = After work I will stop by the store...

So pasas is not wrong; it is just a broader present form than English often uses.

Yes, Esperanto word order is fairly flexible because grammar is shown by endings and function words.

The sentence could be rearranged somewhat without changing the basic meaning, for example:

• Mi pasas ĉe la vendejo post la laboro, ĉar mi bezonas novan kusenon por la sofo.

That still means the same thing.

However, the original order sounds natural because it starts with the time expression Post la laboro, which sets the scene right away.