Vamos ao teatro amanhã.

We are going to the theatre tomorrow.

Breakdown of Vamos ao teatro amanhã.

• ir: to go
• amanhã: tomorrow
• o teatro: the theatre

Questions & Answers about Vamos ao teatro amanhã.

Does "vamos" mean "we go" or "let’s go" here?

It’s the present tense of ir (to go) for nós: vamos = “we go/are going.” In context it can also act like a friendly suggestion “let’s…”, depending on intonation/punctuation:

• Statement: Vamos ao teatro amanhã. (We’re going to the theatre tomorrow.)
• Suggestion/Invitation: Vamos ao teatro amanhã? (Shall we go to the theatre tomorrow?)

Why is the present tense used to talk about tomorrow? Shouldn’t it be future?

European Portuguese often uses the present to talk about the near/scheduled future when there’s a time word. Vamos ao teatro amanhã = “We’re going to the theatre tomorrow.”
The simple future exists: Iremos ao teatro amanhã, but it sounds more formal or emphatic. You’ll also hear the periphrastic future: Vamos ver uma peça amanhã.

What does "ao" mean exactly, and why not "para o"?

Ao is the contraction of a + o (“to + the”) and is the default with ir for going to events/venues you’ll return from: ir ao teatro / ao cinema / ao restaurante.
Para o (to/for the) often implies going somewhere to stay for a while or the destination as an end state: Vou para Lisboa (I’m going to Lisbon [to stay/for some time]). Vamos para o teatro could mean “We’re heading to the theatre building (to be there for a while),” e.g., for rehearsal, not necessarily to watch a play.

Is "ao" the same as "à"? When do you use each?

No.

• ao = a + o (to + the, masculine singular)
• à = a + a (to + the, feminine singular; written with a grave accent)
  Plurals: aos (masc. pl.), às (fem. pl.).
  Examples: Vou ao teatro, Vou à escola, Vou aos concertos, Vou às compras.

Why can’t I say "a teatro" without the article?

With places like theatre, cinema, restaurant, etc., Portuguese normally uses the article. So it’s ao teatro or para o teatro, not a teatro. A few fixed expressions drop the article (e.g., ir a casa, ir a pé), but teatro isn’t one of them.

Could I say "no teatro" instead?

No = em + o (“in/at the”). Use it for location, not movement:

• Movement: Vamos ao teatro. (We’re going to the theatre.)
• Location: Estamos no teatro. (We’re at the theatre.) / O espetáculo é no Teatro Nacional.

Where can "amanhã" go in the sentence?

Common options:

• Amanhã vamos ao teatro.
• Vamos ao teatro amanhã.
• Vamos amanhã ao teatro. (less common)
  Fronting amanhã emphasizes the time. A comma after initial Amanhã is optional in short sentences.

How do I turn this into a yes–no question?

Keep the word order and use rising intonation or a question mark: Vamos ao teatro amanhã?
You can add a tag: Vamos ao teatro amanhã, não é?
For a more explicit invitation: Queres ir ao teatro amanhã? (to one person, using tu, common in Portugal).

How do I say “Let’s go to the theatre tomorrow” more explicitly?

• Vamos ao teatro amanhã! (exclamatory)
• Que tal irmos ao teatro amanhã?
• Bora ao teatro amanhã? (informal/colloquial)

How do I negate it?

Put não before the verb: Não vamos ao teatro amanhã.
Example with an alternative: Não vamos ao teatro amanhã; vamos na sexta.

What’s the gender of "teatro," and does that affect anything?

Teatro is masculine, so it uses o: o teatro, ao teatro, do teatro (from the theatre). Feminine nouns take a/à/da: à escola, da escola, etc.

How do I pronounce it (European Portuguese)?

• vamos ao: the final -s in vamos links to the vowel and sounds like a “z”: roughly [ˈvɐ.mu.zaw].
• teatro: stress on the second syllable (te-a-tro); the initial unstressed e is reduced.
• amanhã: nh is like the “ny” in “canyon,” and ã is nasal: [ɐ.mɐ.ˈɲɐ̃].
  Put together (approx.): [ˈvɐ.mu.zaw t(ɨ)ˈa.tɾu ɐ.mɐ.ˈɲɐ̃].

Can I include the subject pronoun "nós"?

Yes: Nós vamos ao teatro amanhã. Portuguese often drops subject pronouns because the verb ending shows the person. You might add nós for emphasis or clarity. (Colloquially, you may also hear A gente vai ao teatro amanhã, using a third-person singular verb.)

What’s the difference between "amanhã" and "manhã"? Can I say "amanhã de manhã"?

• amanhã = tomorrow
• manhã = morning
  So amanhã de manhã = tomorrow morning. You can also specify other times: amanhã à tarde (tomorrow afternoon), amanhã à noite (tomorrow evening/night).