En esta estación, primero pasas por el torniquete y luego esperas bajo la marquesina si llueve.

En esta estación means at/in this station.

• en = in / at
• esta = this (feminine singular)
• estación is feminine, so esta matches it

Why not the others?

• a esta estación usually means to this station (movement toward it)
• esa estación means that station (near the listener or previously mentioned), not this station

So En esta estación is the natural way to say At this station.

Spanish often uses the informal second person singular (tú) to talk about what you do in a general sense, similar to English you in instructions or descriptions.

So:

• pasas = you go through / you pass
• esperas = you wait

This does not necessarily mean the speaker is addressing one specific close friend. It can simply describe the normal procedure:

• Primero pasas por el torniquete... = First you go through the turnstile...

This is very common in spoken and written Spanish.

Yes. A very common alternative is an impersonal se construction:

• En esta estación, primero se pasa por el torniquete y luego se espera bajo la marquesina si llueve.

This means something like:

• At this station, you first go through the turnstile and then wait under the shelter if it rains.
• More literally: one goes through... one waits...

Difference in tone:

• pasas / esperas = a bit more direct, conversational
• se pasa / se espera = more impersonal, often sounds more formal or instructional

Both are correct.

Spanish often uses the present tense to describe:

• routines
• general procedures
• instructions
• what normally happens

So:

• primero pasas... luego esperas... = first you go through... then you wait...

It is not necessarily about what is happening right now. It can mean:

• this is what you do
• this is the usual process

English does something similar:

• First you go through the turnstile, then you wait...

Here pasar por means to go through or to pass through.

So:

• pasas por el torniquete = you go through the turnstile

Important point: por is part of the idea here. You are moving through something.

Compare:

• pasar por una puerta = go through a door
• pasar por seguridad = go through security
• pasar por el torniquete = go through the turnstile

It is not just pasar on its own; por helps express the path or passage.

Because the idea is movement through the turnstile.

• por = through / by / along, depending on context
• here it means through

So:

• pasar por el torniquete = go through the turnstile

The other options do not fit:

• en el torniquete = in/on the turnstile → wrong meaning
• a el torniquete would become al torniquete, meaning to the turnstile → movement toward it, not through it

So por is the natural preposition here.

Torniquete means turnstile.

In a station, it is the gate you pass through after validating a ticket or transport card.

Be aware that torniquete can also mean tourniquet in medical contexts, but here, because we are in a station, it clearly means turnstile.

Here marquesina means a covered shelter, canopy, or awning-like structure where people wait protected from rain.

In transport contexts in Spain, marquesina often refers to:

• a bus stop shelter
• a covered waiting area
• a roofed structure on a platform

So bajo la marquesina means something like:

• under the shelter
• under the canopy

Because bajo means under, and the sentence is focusing on being under the cover of the structure.

• bajo la marquesina = under the shelter/canopy

Using en would suggest being in something, which is less natural here unless you think of it as an enclosed space. In most station contexts, the important idea is protection from above, so bajo is the normal choice.

They organize the sequence of actions.

• primero = first
• luego = then / afterwards

So the sentence shows order:

1. primero pasas por el torniquete
2. luego esperas bajo la marquesina si llueve

This is a very common way to explain steps or routines.

Yes. In this sentence, luego and después are both possible.

• luego = then
• después = afterwards / later / then

So you could say:

• ...y después esperas bajo la marquesina si llueve.

Both are natural. Luego is very common in Spain.

After si for a real possible condition, Spanish normally uses the present indicative when talking about the future or a general situation.

So:

• si llueve = if it rains

This is the standard pattern:

• Si llueve, esperamos dentro. = If it rains, we wait inside.

Why not the others?

• si lloverá is not standard here; Spanish normally does not use the future after si in this kind of clause
• si lloviera means if it were raining / if it rained in a more hypothetical or less likely sense

So in this sentence, si llueve is exactly right.

It can mean either depending on context, but here it most naturally means:

• if it rains
• if it’s raining
• if the weather is rainy

Because the whole sentence describes what you do at the station, si llueve is a practical condition: when rain happens, you wait under the shelter.

So it is best understood as a general real condition, not necessarily only this exact moment.

Spanish uses definite articles very often, including where English might or might not use the.

Here they are natural because the speaker means the specific turnstile and the specific shelter at that station:

• el torniquete = the turnstile
• la marquesina = the shelter/canopy

Also, nouns in Spanish usually appear with an article unless there is a reason not to.

No. Estación can mean several things depending on context, including:

• station (train, metro, bus, etc.)
• season of the year

Here, because of torniquete and marquesina, it clearly means a transport station.

So context tells you which meaning is intended.

Yes, mainly the vocabulary choice marquesina, which is very common in Spain for a transport shelter or canopy.

Also, the sentence uses tú forms (pasas, esperas), which is natural in Spain when giving general instructions conversationally.

So overall the sentence sounds very normal for Peninsular Spanish.