Você pode me mostrar a passagem antes de embarcar?

In Brazilian Portuguese, passagem most commonly means ticket for travel: plane, bus, train, etc.

• passagem de avião = plane ticket
• passagem de ônibus = bus ticket

If you specifically mean boarding pass, Brazilian Portuguese often uses cartão de embarque.

So in this sentence, a passagem usually sounds like the ticket, though in real-life travel contexts people may sometimes use it loosely if the exact document is obvious from the situation.

me means to me or me, and it is the indirect object of mostrar.

• mostrar = to show
• me mostrar = to show me

So:

• Você pode me mostrar a passagem? = Can you show me the ticket?

In Brazilian Portuguese, putting me before the verb like this is very common and natural in everyday speech.

Because after pode you use the infinitive.

• pode = can / is able to
• mostrar = to show

So the structure is:

• pode + infinitive
• Você pode mostrar...
• Você pode me mostrar...

Compare:

• Ele mostra a passagem. = He shows the ticket.
• Ele pode mostrar a passagem. = He can show the ticket.

a is the feminine singular definite article, meaning the.

• a passagem = the ticket
• uma passagem = a ticket

The noun passagem is feminine, so it takes a or uma.

This sentence uses a passagem because it refers to a specific ticket that both people understand from the situation.

After antes when the next word is a verb, Portuguese normally uses de + infinitive.

So:

• antes de embarcar = before boarding
• antes de sair = before leaving
• antes de entrar = before entering

This is a very common structure in Portuguese.

Portuguese often leaves the subject unstated when it is understood from context.

Here, the implied subject is the same person being spoken to:

• Você pode me mostrar a passagem antes de embarcar?
• literally: Can you show me the ticket before boarding?

The understood meaning is before you board.

Portuguese often does this with de + infinitive constructions.

No. embarcar is broader than the English verb to board might feel in some contexts. It can be used for getting onto different kinds of transportation:

• embarcar no avião = board the plane
• embarcar no ônibus = board the bus
• embarcar no navio = board the ship

So the sentence works in many travel situations, not just at an airport.

Você pode... ? is polite and very common in Brazil.

It is a normal way to ask:

• Você pode me mostrar a passagem? = Can you show me the ticket?

If you want to sound more formal or softer, you could say:

• O senhor pode me mostrar a passagem...? = for a man
• A senhora pode me mostrar a passagem...? = for a woman
• Você poderia me mostrar a passagem...? = Could you show me the ticket...?

So the original sentence is polite, but not especially formal.

Grammatically, yes: mostrar-me exists. But in Brazilian Portuguese, me mostrar is much more natural in everyday speech.

Compare:

• Você pode me mostrar a passagem? = natural in Brazil
• Você pode mostrar-me a passagem? = grammatical, but sounds more formal or more European Portuguese

For Brazilian Portuguese learners, me mostrar is the safer everyday choice.

Yes. Portuguese often allows the subject to be omitted when it is clear.

So these are both natural:

• Você pode me mostrar a passagem antes de embarcar?
• Pode me mostrar a passagem antes de embarcar?

The second one is a little more direct and conversational because it drops você.

Yes. That is another natural option.

• antes de embarcar = before boarding
• antes do embarque = before the boarding / before boarding begins

The first uses a verb. The second uses a noun: embarque = boarding.

Both are correct, but they feel slightly different in structure.

A common Brazilian pronunciation is roughly:

• você ≈ vo-SEH

A few quick pronunciation notes for the whole sentence:

• Você ≈ vo-SEH
• pode ≈ POH-jee or POH-dee depending on accent
• me ≈ mee
• mostrar ≈ mos-TRAR
• a passagem ≈ a pah-sah-ZHEM
• antes de embarcar ≈ AN-cheez jee em-bar-KAR in many Brazilian accents

Pronunciation varies by region, but these approximations are useful for Brazilian Portuguese.

Yes, it is natural and correct.

A Brazilian might also say:

• Você pode me mostrar a sua passagem antes de embarcar?
• Pode me mostrar a passagem antes de embarcar?
• Pode apresentar a passagem antes de embarcar? — a bit more official

One small nuance: in airports, if you specifically want boarding pass, many people would say cartão de embarque instead of passagem. But the original sentence is still understandable and natural in many contexts.