Por atingi la stacidomon, ni devas transiri la straton post la placo.

Por + an infinitive is a very common Esperanto way to show purpose.

So por atingi la stacidomon means to reach the station or in order to reach the station.

• por = for, in order to
• atingi = to reach

English often uses just to reach, but Esperanto often uses por + infinitive very naturally.

Because por and pro mean different things:

• por = for, in order to, with the purpose of
• pro = because of, due to

Here the sentence is talking about the goal of the action: we cross the street in order to get to the station. So por is correct.

If you used pro, the meaning would shift toward because of the station, which is not what is meant here.

Because atingi is a transitive verb: it takes a direct object.

So in Esperanto, you reach something directly:

• atingi la stacidomon = reach the station

You do not normally use al after atingi.

Compare:

• iri al la stacidomo = go to the station
• atingi la stacidomon = reach the station

So Esperanto distinguishes between going toward a place and actually reaching it.

The -n marks the direct object.

In this sentence:

• atingi la stacidomon → the station is what is being reached
• transiri la straton → the street is what is being crossed

So both nouns get -n.

This is one of the most important endings in Esperanto. English usually shows the object by word order, but Esperanto often shows it with -n.

It is a compound word:

• stacio = station
• domo = house, building

In a compound, stacio becomes staci-, so:

• stacidomo = station-building

In ordinary use, this means a station, especially a railway station.

So even if the literal parts are visible, you should usually understand it as the normal word for a station building.

Transiri means to go across or to cross.

It is built from:

• trans- = across
• iri = to go

So:

• transiri la straton = cross the street

This is a very natural Esperanto expression. The thing being crossed, la strato, is the direct object, so it takes -n.

Here it is most naturally understood as after/beyond the square in route directions.

So the idea is something like:

• first you get to or pass the square
• then, after the square, you cross the street

In space, post can also mean behind, but in this kind of sentence it usually means after passing that landmark.

If you wanted to say clearly behind the square as a physical position, malantaŭ la placo would often be clearer.

Because after a preposition like post, the noun is normally not a direct object.

So:

• post la placo = after/behind the square

The -n ending is mainly for direct objects, and also sometimes for direction in certain prepositional phrases. But here la placo is just part of the prepositional phrase telling us where the street-crossing happens in relation to the square.

So la placo is the normal form.

Usually no.

Placo normally means a square, plaza, or open public town space.

For the general English idea of place, Esperanto often uses:

• loko = place, location

So la placo here is not just any place; it is specifically a square/plaza.

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

For example, this would also be fine:

• Ni devas transiri la straton post la placo por atingi la stacidomon.

That version puts the main action first and the purpose last.

The original version starts with Por atingi la stacidomon to emphasize the goal first: to get to the station.

It can mean either, depending on context.

• devi = must, have to, be obliged to, need to

In this sentence, it expresses necessity:

• ni devas transiri la straton = we must / have to cross the street

The idea is not necessarily a strict command; it can simply mean that crossing the street is the necessary step if we want to reach the station.