Abans de sortir, ha de guardar el seu passaport a la bossa.

In Catalan, abans de + infinitive is the normal pattern for before doing something.

So:

• abans de sortir = before leaving / before going out

The de is required here in standard Catalan.

A useful comparison:

• abans de sortir = before leaving
• abans que surti = before he/she leaves

So:

• abans de
  • infinitive
• abans que
  • conjugated verb

It can mean either, depending on context.

The basic idea of sortir is to go out / to exit. In many everyday sentences, English would naturally translate it as leave.

So in this sentence:

• Abans de sortir could mean Before leaving
• or Before going out

If the context is simply leaving the house or a place, before leaving is probably the best English sense.

Ha de is part of the structure haver de + infinitive, which expresses obligation or necessity.

So:

• ha de guardar = he/she has to put away, he/she must keep, or you have to in formal address

It does not mean the present perfect here.

Compare:

• ha de guardar = has to put away / must put away
• ha guardat = has put away / has kept

That difference is very important:

• ha de + infinitive = obligation
• ha + participle = present perfect

Catalan often leaves out subject pronouns because the verb form usually gives enough information.

Here, ha is third person singular, so the subject is understood from context:

• ell = he
• ella = she
• vostè = you, formal

So ha de guardar can mean:

• he has to put away
• she has to put away
• you have to put away, if speaking formally

You can add the pronoun for emphasis or contrast, but it is not necessary:

• Ella ha de guardar el seu passaport...

Yes, guardar often means keep, store, put away, or look after. In this sentence, it has the sense of putting something somewhere safely.

So:

• guardar el passaport a la bossa = put the passport in the bag / keep the passport in the bag

This sounds natural because a passport is something valuable, so guardar suggests not just placing it somewhere, but placing it somewhere safe or proper.

If you used posar, that would mean more simply to put:

• posar el passaport a la bossa

That is also possible, but guardar adds the idea of putting it away for safekeeping.

Catalan normally uses the definite article before possessives with ordinary nouns.

So the normal pattern is:

• el meu llibre
• la seva bossa
• el seu passaport

That means the + possessive + noun is standard in Catalan, even though English does not use the in this structure.

So:

• el seu passaport literally looks like the his/her passport
• but it simply means his/her passport or your passport in formal address

Using seu passaport on its own would not be the normal standard form here.

Seu can mean several things depending on context.

It can refer to:

• his
• her
• its
• your formal
• sometimes their, depending on usage and context

The form seu agrees with the noun possessed, not with the owner.

Here:

• passaport is masculine singular
• so the possessive is seu

Compare:

• el seu passaport = his/her/your formal passport
• la seva bossa = his/her/your formal bag
• els seus documents = his/her/your formal documents
• les seves claus = his/her/your formal keys

If Catalan speakers want to avoid ambiguity, they may use a clearer form such as:

• el passaport d’ell = his passport
• el passaport d’ella = her passport

This is a very common thing for English speakers to notice.

In Catalan, after verbs like posar, guardar, or ficar, the preposition a is often used where English would use in.

So:

• guardar el passaport a la bossa = put/keep the passport in the bag

This is natural Catalan.

If you want to emphasize the idea of being physically inside, you could also say:

• dins la bossa
• dins de la bossa

But a la bossa is completely normal and idiomatic.

Yes. That word order is also correct.

Both versions are natural:

• Abans de sortir, ha de guardar el seu passaport a la bossa.
• Ha de guardar el seu passaport a la bossa abans de sortir.

The difference is mostly one of focus and rhythm:

• starting with Abans de sortir highlights the time condition first
• putting it at the end gives the main action first

The comma is natural when Abans de sortir comes first.

No, not definitely.

Because Catalan often drops the subject pronoun, ha de by itself does not tell you whether the subject is:

• he
• she
• you formal

Also, el seu passaport does not resolve the ambiguity, because seu can also refer to several possible owners depending on context.

So the sentence could mean:

• Before leaving, he has to put his passport in the bag
• Before leaving, she has to put her passport in the bag
• Before leaving, you have to put your passport in the bag if speaking formally

Only the wider context tells you which one is intended.