Si tienes un hueco mañana, vamos juntas a reclamar en la oficina.

No. Here tener un hueco is an idiomatic expression.

In this sentence, un hueco means a free moment, some spare time, or an opening in your schedule.

So:

• Si tienes un hueco mañana... = If you have some time tomorrow...

Literally, hueco can mean hole, gap, or empty space, but in everyday Spanish it is very commonly used for free time in your agenda.

Examples:

• No tengo ni un hueco hoy. = I don’t have a single free moment today.
• ¿Tienes un hueco esta tarde? = Do you have some time this afternoon?

Because Spanish normally uses the present indicative after si when talking about a real, possible future condition.

So:

• Si tienes un hueco mañana... = If you have some time tomorrow...

This is the normal pattern for likely conditions:

• Si puedo, voy. = If I can, I’ll go.
• Si vienes mañana, te lo doy. = If you come tomorrow, I’ll give it to you.

Why not si tendrás?

• Spanish generally does not use the future tense after si in this kind of sentence.

Why not si tuvieras?

• Si tuvieras would sound more hypothetical or less likely:
  • Si tuvieras un hueco mañana, iríamos... = If you had some time tomorrow, we would go...

So si tienes is the natural choice here.

Yes, literally vamos means we go, but in Spanish it is also very commonly used to mean let’s go.

So here:

• vamos juntas a reclamar en la oficina = let’s go together to complain / make a claim at the office

This is the first person plural imperative function, even though the form is the same as the present tense.

Compare:

• Voy = I go
• Vas = you go
• Vamos = we go / let’s go

This use is extremely common:

• Vamos a comer. = Let’s eat.
• Vamos al cine. = Let’s go to the cinema.

Because juntas agrees with the people involved, and it shows that the speaker is talking to a female person and that the speaker is also female, or that the whole group referred to is female.

Spanish adjectives often change form to match gender and number:

• juntos = together, masculine plural or mixed group
• juntas = together, feminine plural

So:

• vamos juntas means let’s go together, said by a woman to another woman

If a man were speaking to another man, or to a mixed group, you would normally get:

• vamos juntos

This is one of the clues that tells you who is speaking to whom.

Here reclamar most likely means to make a complaint, to file a claim, or to demand what you are entitled to.

It is broader than English complain. Depending on context, reclamar can mean:

• to complain
• to make a formal claim
• to demand
• to ask for something you have a right to

In a phrase like reclamar en la oficina, it often suggests some kind of official complaint or claim, for example about a service, a bill, paperwork, or an administrative problem.

So it may be stronger or more formal than just quejarse.

A useful contrast:

• quejarse = to complain, to grumble
• reclamar = to make a complaint/claim, often expecting action or correction

Because a and en express different ideas here.

• ir a la oficina = to go to the office
• reclamar en la oficina = to complain / make a claim at the office

In the sentence, the destination is already implied by vamos plus the action that will happen there. The phrase en la oficina tells you where the complaining/claiming will take place.

So the structure is:

• vamos juntas = let’s go together
• a reclamar = to make a complaint / claim
• en la oficina = at the office

You could also hear:

• vamos a la oficina a reclamar

That version makes the destination more explicit:

• let’s go to the office to make a complaint

Both are possible, but the given sentence focuses a bit more on the action.

Because Spanish usually leaves subject pronouns out when they are not necessary.

The verb endings already tell you who the subject is:

• tienes = you have
• vamos = we go / let’s go

So Spanish normally says:

• Si tienes un hueco... not usually
• Si tú tienes un hueco...

And:

• vamos juntas not usually
• nosotras vamos juntas

The pronouns tú or nosotras would only be added for emphasis, contrast, or clarification.

For example:

• Si tú tienes un hueco, yo no. = If you have some time, I don’t.
• Nosotras vamos juntas, ellos no. = We’re going together, they aren’t.

Mañana here means tomorrow, and it tells you when the condition applies:

• Si tienes un hueco mañana... = If you have some time tomorrow...

Spanish often places time expressions in flexible positions, but here this is very natural because mañana modifies the idea of having a free slot.

Other possible placements could be:

• Si mañana tienes un hueco...
• Vamos mañana juntas a reclamar...

But the original sentence sounds perfectly natural and clear.

Also, remember that mañana can mean two different things depending on context:

• tomorrow
• morning

In this sentence, it clearly means tomorrow.

Yes, vamos juntas is very natural if the speaker is making a suggestion that includes both people.

It means something like:

• let’s go together
• why don’t we go together

This is different from:

• ve conmigo = go with me

Ve conmigo is a direct command to the other person.
Vamos juntas is more inclusive and collaborative, because the speaker includes herself in the action.

So the tone is softer and more natural for suggesting a shared plan.

It sounds informal.

There are several clues:

• tienes uses tú, not usted
• un hueco is a very everyday expression
• vamos juntas sounds conversational and direct

A more formal version might be something like:

• Si tiene un momento mañana, podemos ir juntas a reclamar a la oficina.

Or, if speaking formally but still to a woman:

• Si tiene un hueco mañana, podemos ir juntas a reclamar.

So the original sentence sounds like one person speaking casually to a female friend, colleague, or acquaintance.

Yes, and that is an important point.

Reclamar often sits somewhere between to complain, to make a claim, and to demand. The best translation depends on context.

For example:

• If the issue is bad service, it may sound like complain
• If it is about money, paperwork, or a right, it may sound more like make a claim
• If it is about insisting on something owed, it may sound like demand

So in this sentence, without more context, reclamar could mean:

• complain at the office
• make a claim at the office
• go sort it out officially at the office

That is why learners should not assume it always matches one single English word.

Grammatically, vayamos exists, but it would not be the normal choice here.

In everyday Spanish, the usual way to say let’s go is simply:

• vamos

Using vayamos sounds much more formal, literary, or unusual in normal conversation.

So:

• Si tienes un hueco mañana, vamos juntas... = natural everyday Spanish
• Si tienes un hueco mañana, vayamos juntas... = possible in theory, but not the normal conversational option

For practical spoken Spanish, learners should strongly prefer vamos here.