Acabamos de llegar al vestíbulo.

It uses the structure acabar de + infinitive, which means to have just done something.

So:

• acabamos de llegar = we have just arrived / we just arrived

Here, llegar means to arrive, and acabamos de adds the idea of just now.

By itself, acabar usually means to finish or to end:

• Acabamos el proyecto. = We finished the project.

But when you use acabar de + infinitive, it becomes a very common expression meaning to have just done something:

• Acabamos de comer. = We just ate.
• Acabo de llamarte. = I just called you.

So the de + infinitive is what changes the meaning.

Acabamos is the present tense, first person plural form of acabar:

• yo acabo
• tú acabas
• él/ella/usted acaba
• nosotros/nosotras acabamos
• ellos/ellas/ustedes acaban

Because the sentence means we have just arrived, it uses the we form: acabamos.

That is normal in Spanish with acabar de + infinitive.

Even though the action already happened, Spanish uses the present tense of acabar to express recent past:

• Acabo de salir. = I just left.
• Acabamos de llegar. = We just arrived.

So this is one of those places where Spanish and English do not match word for word.

In this expression, de is required. You normally cannot leave it out.

• acabar de + infinitive = to have just done something

So:

• Acabamos de llegar is correct.
• Acabamos llegar is incorrect.

Think of acabar de as one unit when it has this meaning.

Because a + el contracts to al in Spanish.

So:

• a + el = al

That is why:

• llegar al vestíbulo = to arrive at the lobby

This contraction is required in standard Spanish.

A similar contraction happens with de + el = del.

The verb llegar is usually followed by a when you say the place someone arrives at.

• llegar a casa
• llegar al hotel
• llegar a la estación

So:

• llegar al vestíbulo = to arrive at the lobby

This is just the normal pattern of the verb.

Vestíbulo usually means lobby, foyer, or entrance hall, depending on the building and context.

In Latin America, lobby is also often understood, especially in hotels or office buildings, but vestíbulo is a standard Spanish word.

Possible translations include:

• lobby
• foyer
• entrance hall

The best English choice depends on context.

Yes, it is grammatical and natural.

That said, in everyday Latin American speech, people might also say things like:

• Recién llegamos al vestíbulo.
• Acabamos de llegar al lobby.
  (especially in places where lobby is commonly used)

But Acabamos de llegar al vestíbulo is perfectly good Spanish.

Not in this sentence.

Compare:

• Acabamos el trabajo. = We finished the work.
• Acabamos de llegar. = We just arrived.

The presence of de + infinitive makes the meaning clear: just did something.

So in your sentence, it does not mean we finished arriving. It means we just arrived.

Spanish often leaves out subject pronouns because the verb ending already shows who the subject is.

• acabamos already tells you the subject is we

So:

• Acabamos de llegar al vestíbulo.
• Nosotros acabamos de llegar al vestíbulo.

Both are correct, but the version without nosotros is more neutral and more common unless you want emphasis or contrast.

Yes. Both can work.

Depending on the context, common English translations are:

• We just arrived at the lobby.
• We’ve just arrived at the lobby.
• We’ve just arrived in the lobby.
• We just got to the lobby.

In natural English, many speakers would more likely say in the lobby or at the lobby depending on the situation, but the Spanish sentence itself is straightforward.

Yes, but it would not mean exactly the same thing.

• Acabamos de llegar = We just arrived
• Hemos llegado = We have arrived

Acabamos de llegar emphasizes that it happened very recently.
Hemos llegado simply states the arrival, without the strong just now idea.

So if just now matters, acabamos de llegar is the better choice.

A rough pronunciation guide is:

ah-kah-BAH-mohs de yeh-GAR al beh-STEE-boo-loh

A few notes:

• ll in much of Latin America is often pronounced like y
• g in llegar is a strong guttural sound before a
• the stress is on:
  • ba in acabamos
  • gar in llegar
  • tí in vestíbulo

Yes. Vestíbulo can be the entrance area of many kinds of buildings, such as:

• a hotel
• a theater
• an office building
• a school
• an apartment building

So it is broader than just a hotel lobby. Context tells you what kind of entrance area it is.