O árbitro vai apitar o jogo hoje?

Vai apitar is the very common ir + infinitive future, which works a lot like is going to referee / will referee in English.

• vai = goes / is going
• apitar = to whistle / to referee

So O árbitro vai apitar o jogo hoje? literally looks like Is the referee going to referee the game today?

In Brazilian Portuguese, this structure is often more natural in everyday speech than the simple future:

• O árbitro vai apitar o jogo hoje? = very common, conversational
• O árbitro apitará o jogo hoje? = correct, but more formal or less common in speech

Literally, apitar means to blow a whistle. But in sports contexts, it often means to referee, to officiate, or to be the referee for a match.

So in this sentence, apitar o jogo does not just mean making a whistle sound. It means the referee will be the official in charge of the game.

Examples:

• Ele apitou a final. = He refereed the final.
• Quem vai apitar o clássico? = Who is going to referee the derby/classic match?

Both are definite articles, meaning the.

• o árbitro = the referee
• o jogo = the game

Portuguese uses definite articles very often, including in places where English might or might not use the depending on context.

Here, the sentence is talking about:

• a specific referee, or a referee already known from context
• a specific game, or one that both speaker and listener know about

So O árbitro vai apitar o jogo hoje? is naturally Is the referee going to officiate the game today?

In Portuguese, yes/no questions are often formed just by intonation in speech or by adding a question mark in writing. The word order can stay exactly the same as in a statement.

Compare:

• Statement: O árbitro vai apitar o jogo hoje.
• Question: O árbitro vai apitar o jogo hoje?

Unlike English, Portuguese usually does not need inversion like Is the referee... ?

That is very normal in Brazilian Portuguese.

A rough pronunciation guide:

• árbitro → stress on the first syllable: AR-bi-tro
• apitar → a-pi-TAR
• jogo → ZHO-goo in many Brazilian accents
• hoje → OH-zhee or HO-zhee, depending on accent

A few helpful notes:

• The accent mark in árbitro shows the stress: ÁR-bi-tro
• The j in jogo and hoje sounds like the s in measure or the zh sound
• Final o in Brazilian Portuguese often sounds closer to oo

There is a feminine form: árbitra.

So if the referee is a woman, you would usually say:

• A árbitra vai apitar o jogo hoje?

Forms:

• o árbitro = the male referee
• a árbitra = the female referee

In real sports language, you may hear both depending on the person being referred to.

Yes. Hoje is fairly flexible.

These are all possible:

• O árbitro vai apitar o jogo hoje?
• Hoje o árbitro vai apitar o jogo?
• O árbitro vai hoje apitar o jogo? — possible, but less natural in everyday Brazilian Portuguese

The original version sounds very natural. Putting hoje at the end is common and smooth.

You can use both, but they are not always equally common in every context.

• jogo = game, match
• partida = match, fixture

In everyday Brazilian Portuguese, especially in sports, jogo is extremely common and natural.

So:

• O árbitro vai apitar o jogo hoje? = very natural
• O árbitro vai apitar a partida hoje? = also correct, a bit more formal or sports-journalism-like in some contexts

Yes, in many sports contexts, especially soccer, Brazilians often say juiz informally to mean the referee.

• árbitro = referee, more technical/official term
• juiz = literally judge, but often used informally for the referee

So both can work:

• O árbitro vai apitar o jogo hoje?
• O juiz vai apitar o jogo hoje?

Usually, árbitro sounds a bit more precise, while juiz can sound more conversational in sports talk.

Yes, it is natural and idiomatic.

It sounds like something someone might ask before a sports event:

• wondering whether a certain referee will officiate
• checking if the match assignment is confirmed

The combination vai apitar o jogo is especially natural in Brazilian sports language.