Mostre o bilhete antes que a plataforma fique cheia.

Mostre is the imperative form of mostrar (to show), used to give a command or instruction.

In Brazilian Portuguese, this form usually matches você:

• Mostre o bilhete. = Show the ticket.

So this sentence sounds like:

• a polite/direct instruction
• something you might hear from staff, signage, or an announcement

It is not the tu command form. In standard grammar, the tu affirmative command would be mostra.

Yes, generally mostre sounds like a você command, which is the most common neutral/polite way to address someone in much of Brazil.

Compare:

• Mostra o bilhete. → tu command
• Mostre o bilhete. → você command
• Mostrem o bilhete. → plural command (you all show the ticket)

In Brazil, even when the tone is direct, você forms are very common in public instructions.

Here, bilhete means ticket.

But bilhete can have other meanings depending on context, such as:

• a small written note
• a ticket for transport or entry
• sometimes even a banknote in some expressions

In this sentence, because of plataforma (platform), the meaning is clearly ticket.

A learner may also wonder about similar words:

• ingresso = ticket for an event, movie, concert, etc.
• passagem = fare/ticket for travel
• bilhete = often a physical ticket, especially in transport-related contexts

Because antes que is used before a conjugated verb, while antes de is used before an infinitive.

Here we have:

• antes que a plataforma fique cheia
  • literally: before the platform becomes full

The verb fique is conjugated, so antes que is required.

Compare:

• Mostre o bilhete antes de entrar.
  Show the ticket before entering.
• Mostre o bilhete antes que a plataforma fique cheia.
  Show the ticket before the platform gets crowded/full.

So the difference is grammatical:

• antes de + infinitive
• antes que + clause with a verb

Because antes que normally triggers the subjunctive.

So:

• fica = indicative
• fique = present subjunctive

In this sentence, the platform becoming full is something that has not happened yet and is seen as a future/possible event. That is exactly the kind of situation where Portuguese often uses the subjunctive.

So:

• antes que a plataforma fique cheia = before the platform gets full

This is one of the most important patterns to remember:

• antes que + subjunctive

Other examples:

• Saia antes que chova. = Leave before it rains.
• Termine isso antes que eu mude de ideia. = Finish that before I change my mind.

It comes from ficar.

Ficar has several common meanings, including:

• to stay
• to remain
• to become / get

In this sentence it means to become / get:

• a plataforma fique cheia = the platform gets/becomes full

So this is not about the platform staying full, but about it becoming full.

Because Portuguese often expresses a change of state with:

• ficar + adjective

So:

• ficar cheia = to become/get full
• ficar cansado = to get tired
• ficar pronto = to become ready / get ready

If you said esteja cheia, that would mean be full, focusing more on the state itself:

• antes que a plataforma esteja cheia = before the platform is full

That is possible, but fique cheia emphasizes the idea of becoming full, which fits the sentence very naturally.

Because cheia agrees with a plataforma, which is a feminine singular noun.

Agreement in Portuguese:

• o vagão cheio = the full car
• a plataforma cheia = the full platform
• os vagões cheios = the full cars
• as plataformas cheias = the full platforms

So cheia is feminine singular to match plataforma.

Yes, very often.

• cheia = full
• lotada = packed, crowded, completely full

So:

• antes que a plataforma fique cheia = before the platform gets full
• antes que a plataforma fique lotada = before the platform gets packed/crowded

Lotada often sounds stronger and is very common for crowded public spaces.

Because in Portuguese, the subject does not always have to come before the verb.

In the clause:

• que a plataforma fique cheia

the subject is a plataforma, and the verb is fique.

A native English speaker may expect something more obviously ordered like English, but this Portuguese structure is completely normal:

• antes que a plataforma fique cheia

It simply means:

• before the platform gets full

Yes, it is grammatical and understandable, but the exact naturalness depends on context.

It sounds like:

• a formal instruction
• a warning
• something said in a transportation setting

In real life, Brazilians might also say things like:

• Mostre o bilhete antes de a plataforma lotar.
• Apresente o bilhete antes que a plataforma fique lotada.

A few nuances:

• apresente can sound more official than mostre
• lotar / ficar lotada may sound more natural for crowds than ficar cheia

But the original sentence is absolutely fine and easy to understand.

A rough pronunciation guide is:

MOS-tree oo bee-LYE-chee AN-tes kee a plata-FOR-ma FEE-kee SHAY-a

A few important pronunciation notes:

• mostre: the final e is pronounced, roughly like ee
• bilhete: lh sounds like the lli in million
• que usually sounds like kee
• fique: the qu here gives a hard k sound
• cheia sounds roughly like SHAY-a

Pronunciation varies by region, but this is a useful general Brazilian approximation.