No puedo quedar el viernes porque tengo un compromiso, pero te enviaré el resguardo en cuanto llegue a casa.

Here quedar means to arrange to meet or simply to meet up, which is very common in Spain.

So No puedo quedar el viernes means:

• I can’t meet on Friday
• I can’t meet up on Friday

In Spain, quedar is used a lot for making plans with someone:

• ¿Quedamos mañana? = Shall we meet tomorrow?
• He quedado con Ana. = I’ve arranged to meet Ana.

So this is a very natural Spain-Spanish use of quedar.

In Spanish, days of the week are normally used with the definite article to mean on that day:

• el viernes = on Friday
• el lunes = on Monday

So:

• No puedo quedar el viernes = I can’t meet on Friday

You do not usually say en el viernes for this meaning.

A useful pattern:

• el viernes = on Friday
• los viernes = on Fridays / every Friday

Because poder + infinitive means can / be able to do something.

• No puedo quedar = I can’t meet
• No quedo would not normally mean that in this context

Here, puedo expresses ability or possibility. The speaker is saying they are not able to meet on Friday.

Compare:

• Quedo con Marta mañana. = I’m meeting Marta tomorrow.
• No puedo quedar mañana. = I can’t meet tomorrow.

No. Compromiso is a false friend here.

In this sentence, un compromiso means:

• an engagement
• a prior commitment
• an obligation

So tengo un compromiso means:

• I have a prior engagement
• I already have something I have to attend

It does not mean a compromise in the English sense.

In everyday Spanish, this is a very common and polite way to say you already have plans or an obligation.

Resguardo usually means some kind of receipt, slip, proof, or document confirming something.

The exact translation depends on context. It can refer to:

• a receipt
• a deposit slip
• proof of payment
• a collection slip
• a confirmation document

So te enviaré el resguardo means something like:

• I’ll send you the receipt
• I’ll send you the proof/document
• I’ll send you the confirmation slip

This is especially common in administrative, banking, shipping, or formal contexts in Spain.

Te is the indirect object pronoun meaning to you.

So:

• enviaré = I will send
• te enviaré = I will send you

The full idea is:

• I will send the receipt to you

In Spanish, the indirect object pronoun is usually included even when English would just say you.

Compare:

• Te escribiré mañana. = I’ll write to you tomorrow.
• Te lo enviaré. = I’ll send it to you.

Both are possible.

• te enviaré = I will send you
• te voy a enviar = I’m going to send you

In many cases, both forms are natural. The simple future (enviaré) often sounds:

• slightly more formal
• slightly more written
• sometimes a bit more definite or polite

Since the sentence includes resguardo, which is a somewhat formal word, te enviaré fits the tone well.

Also note the accent:

• enviaré = future, I will send
• enviare without the accent would be incorrect here

Because after en cuanto when referring to a future action, Spanish normally uses the subjunctive.

So:

• en cuanto llegue a casa = as soon as I get home

This is one of the most important patterns to learn:

• cuando + future idea often takes subjunctive
• en cuanto + future idea often takes subjunctive

Examples:

• Te llamo en cuanto llegue. = I’ll call you as soon as I arrive.
• Cuando tenga tiempo, lo hago. = When I have time, I’ll do it.

If you say en cuanto llego, that usually sounds wrong here for standard Spanish, because the arrival has not happened yet.

Llegue is the present subjunctive of llegar.

The sentence uses it because the speaker is talking about a future event after en cuanto:

• en cuanto llegue a casa = as soon as I get home

Formation:

• infinitive: llegar
• yo form: llego
• remove -o, add subjunctive ending: llegue

This is also why the spelling changes:

• llegar → llegue

The u is added so the g keeps the hard sound before e.

Compare:

• llego = I arrive / I am arriving
• llegue = that I arrive / when I arrive in subjunctive contexts

In Spanish, a casa is the normal way to say home when you mean going to your own home or home in a general sense.

So:

• llegue a casa = I get home
• voy a casa = I’m going home

Using la would usually sound more like a specific physical house:

• voy a la casa de Ana = I’m going to Ana’s house

So in this sentence, a casa is exactly what you would expect.

Yes, absolutely.

• porque tengo un compromiso = because I have an engagement
• porque ya tengo un compromiso = because I already have an engagement

Adding ya makes the idea a little more explicit: the commitment was already there.

Both are natural. Without ya, the sentence is still perfectly clear.

Yes, it is normal and correct here.

The sentence joins two main parts:

• No puedo quedar el viernes porque tengo un compromiso
• pero te enviaré el resguardo en cuanto llegue a casa

Putting a comma before pero is standard punctuation in Spanish when linking longer clauses like this.

So the comma helps readability and sounds natural in writing.

Yes, but the meaning and tone change slightly.

Possible alternatives:

• No puedo quedar el viernes = most natural in everyday Spain Spanish
• No puedo verme contigo el viernes = less common in this situation, though possible
• No puedo reunirme el viernes = more formal, more like I can’t meet / have a meeting on Friday

So quedar is the best everyday choice for casual plans.

Yes, especially because of quedar and resguardo.

• quedar meaning to meet up is very common in Spain
• resguardo is also a word strongly associated with Spain, especially in formal or administrative contexts

A speaker from another Spanish-speaking country might understand the sentence perfectly but might choose slightly different words, such as:

• juntarse, verse, or reunirse instead of quedar
• comprobante, recibo, or constancia instead of resguardo, depending on the country and context

So the sentence sounds very natural for Spain-Spanish.