Ensaiamos juntos para não desafinar.

Ensaiamos is the 1st person plural form of ensaiar, so it means we rehearse or we rehearsed, depending on context.

In this sentence, it is most naturally understood as present tense: we rehearse.

A useful thing to know is that in Portuguese, ensaiamos can look the same in:

• the present: we rehearse
• the simple past (preterite): we rehearsed

Usually, the rest of the sentence or the situation tells you which meaning is intended. Here, para não desafinar sounds like a general purpose or habit, so we rehearse together so as not to go out of tune is the most likely reading.

Portuguese often drops subject pronouns when the verb ending already makes the subject clear.

So instead of saying Nós ensaiamos, Portuguese very often just says Ensaiamos.

Both are correct:

• Nós ensaiamos juntos...
• Ensaiamos juntos...

The version without nós is very natural and common.

Juntos means together.

It is plural because it agrees with the implied subject we. In Portuguese, words like this often match the people involved.

Compare:

• Eu ensaio junto com ela. = I rehearse together with her. / more naturally I rehearse with her.
• Nós ensaiamos juntos. = We rehearse together.
• Nós ensaiamos juntas. = same meaning, but used if the group is all female

So:

• juntos = mixed group or all male
• juntas = all female group

Not in this sentence.

Here, juntos works like an adjective/adverbial expression referring to we, so it agrees in number and gender:

• juntos
• juntas

Junto by itself would not fit with ensaiamos here.

You may also see:

• Ensaiamos juntos.
• Ensaiamos junto.

In some varieties of spoken Brazilian Portuguese, junto may be heard informally, but the standard and safest form for learners in this sentence is juntos.

Para here means in order to or so as to. It introduces a purpose.

So:

• Ensaiamos juntos = We rehearse together
• para não desafinar = so as not to go out of tune

This structure is very common in Portuguese:

• Estudo para aprender. = I study in order to learn.
• Cheguei cedo para ajudar. = I arrived early to help.
• Saímos cedo para não pegar trânsito. = We left early so as not to get stuck in traffic.

Because não negates the infinitive desafinar.

So:

• para desafinar = in order to go out of tune
• para não desafinar = in order not to go out of tune

This is the normal word order in Portuguese:

• para não errar = so as not to make mistakes
• para não esquecer = so as not to forget

Desafinar means to go out of tune, to sing/play out of tune, or to be off-pitch.

It comes from afinar, which means to tune or to make something in tune.

So:

• afinar o violão = to tune the guitar
• desafinar = to become out of tune or to sing/play out of tune

In this sentence, it likely refers to music rehearsal, especially singing or playing together without sounding off-pitch.

Mostly, yes. Its main meaning is musical: being out of tune.

But like many music-related words, it can sometimes be used more loosely or figuratively, depending on context. Still, for learners, the safest meaning is the musical one.

So in Ensaiamos juntos para não desafinar, the idea is clearly musical: rehearsing together so the performance sounds right.

Sometimes yes, but in order to or so as to gives the structure more clearly.

English often uses just to:

• We rehearse together not to go out of tune sounds awkward
• We rehearse together so as not to go out of tune sounds better
• We rehearse together in order not to go out of tune is also good

So although para + infinitive often corresponds to English to + verb, in this specific sentence a fuller translation sounds more natural.

A helpful approximate pronunciation is:

en-sai-A-mos

Some notes:

• en sounds nasal
• sai sounds roughly like sigh
• the stress falls on ai

So it sounds approximately like en-sigh-AH-moos, though English spelling cannot capture it perfectly.

Also, ensaiar begins with ensa-, and the s here sounds like a normal s sound.

Não has a nasal sound that does not exist in the same way in English.

A rough approximation is: nowng or nãw

But that is only approximate. The important point is that the vowel is nasal, and the final o is not pronounced like a clear English oh.

This word is extremely common in Portuguese, so it is worth practicing early.

Yes, grammatically it can, because ensaiamos can also be the preterite form we rehearsed.

Whether it means we rehearse or we rehearsed depends on context.

For example:

• If someone is describing a routine, it probably means we rehearse
• If someone is telling a story about a specific event, it could mean we rehearsed

Without more context, the present/habitual reading is usually the most natural here.

Yes. In Brazilian Portuguese, a gente is very common in everyday speech and often means we.

So a more conversational version could be:

• A gente ensaia junto para não desafinar.

A few differences:

• a gente takes 3rd person singular verb forms: ensaia
• junto is often heard in casual speech with a gente
• nós ensaiamos juntos sounds a bit more formal or careful, though still completely natural

So the original sentence is correct and natural, but a gente would also be very common in Brazil.