Imagine uma cidade tranquila.

Here, imagine is being used as an imperative: a command or invitation, like telling someone to picture something in their mind.

In Brazilian Portuguese, the imperative form used with você often looks the same as the present subjunctive form. So with imaginar, the você command is imagine.

So this sentence is essentially addressing an implied você:

(Você) imagine uma cidade tranquila.

In standard Portuguese, when you give a command to você, you normally use imagine.

• imagina can be:
  • the ele/ela/você present indicative form: he/she/you imagine(s)
  • the tu affirmative imperative in varieties that use tu

So for a neutral Brazilian Portuguese instruction aimed at você, imagine is the expected form.

That said, English speakers should know that imagina! is also a very common expression in Brazil, but in other contexts, often meaning something like no way, sure, or don’t mention it, depending on tone and situation.

Yes. The subject você is understood but not stated.

Portuguese often leaves subject pronouns out when they are clear from context. In commands especially, this is very normal.

So:

• Imagine uma cidade tranquila.
• Você imagine uma cidade tranquila.

The first is much more natural.

Because Portuguese normally uses an article here, just like English uses a in Imagine a quiet city.

uma cidade means a city. It introduces the noun as one example or image.

If you said only Imagine cidade tranquila, it would sound incomplete or unnatural in normal Portuguese.

Because tranquila has to agree with cidade, and cidade is a feminine noun.

In Portuguese, adjectives usually agree with the noun in gender and number:

• cidade tranquila = feminine singular
• bairro tranquilo = masculine singular
• cidades tranquilas = feminine plural
• bairros tranquilos = masculine plural

So the -a ending is there because cidade is feminine.

You mainly know because it takes the feminine article uma:

• uma cidade

Also, cidade is simply a noun that is grammatically feminine in Portuguese. As in many languages, grammatical gender is something you often have to learn together with the noun.

A good habit is to learn nouns with their article:

• a cidade
• o bairro
• a casa
• o carro

Because in Portuguese, descriptive adjectives often come after the noun.

So cidade tranquila is the normal order.

English usually does the opposite:

• quiet city

Portuguese more often says:

• cidade tranquila

You can sometimes put adjectives before the noun, but that usually sounds more literary, emotional, or stylistically marked. In this sentence, uma tranquila cidade would sound much less natural.

A helpful approximation is:

ee-mah-ZHEE-nee

More specifically:

• i = like ee
• ma = mah
• gi = the zh sound, like the s in measure
• final ne = nee

So the stress falls on -gi-:

i-ma-ZHI-ni

In IPA, a common Brazilian pronunciation is /imaˈʒini/.

A simple approximation is:

see-DAH-jee tran-KEE-lah

A few details:

• cidade: the d before e often sounds like j in many Brazilian accents, so it comes out close to see-DAH-jee
• tranquila: the stress is on qui, so tran-KEE-la
• the tran- part is slightly nasal in Brazilian Portuguese

So altogether:

Imagine uma cidade tranquila
ee-mah-ZHEE-nee OO-ma see-DAH-jee tran-KEE-lah

In tranquila, qu is pronounced like a plain k sound before i:

• qui = kee

Portuguese spelling uses qu before e and i to keep the hard k sound.

So:

• que = roughly keh
• qui = roughly kee

In tranquila, the u is not pronounced separately. You do not say tran-kwee-la. You say:

tran-KEE-la

Because it does not need one under current spelling rules.

Also, older spellings used tranqüila with a trema (¨) over the u, but modern Portuguese spelling removed that mark in ordinary words.

So today the standard spelling is:

tranquila

The stress is naturally on the second-to-last syllable:

tran-QUI-la

Since that stress pattern is regular, no accent mark is needed.

Not especially. It is neutral and very natural in Brazilian Portuguese.

Even though the command uses the você form imagine, that does not automatically make it stiff or overly formal. This kind of wording is common in:

• advertising
• guided meditation
• storytelling
• presentations
• writing prompts

So it sounds natural, clear, and standard.

Yes, absolutely.

Imperatives in Portuguese are not always harsh commands. Very often they are soft invitations, suggestions, or instructions. In this sentence, Imagine uma cidade tranquila feels more like:

• Picture this
• Just imagine
• Think of a quiet city

So the tone depends a lot on context and voice, not just grammar.