Aviva la brasa, por favor.

Aviva is the informal singular affirmative imperative of avivar. In other words, it is the tú command form, used when telling one person you know well or are speaking to casually to do something.

• Infinitive: avivar
• Tú command: aviva

So the sentence is giving a direct instruction to one person.

Spanish usually leaves out subject pronouns when they are not needed, because the verb ending already tells you who the subject is.

In aviva, the command form already shows that the speaker is talking to you (informal singular), so tú is unnecessary.

You could say Tú, aviva la brasa, but that would sound marked, as if you were emphasizing you in particular.

In Spanish, brasa can be used in the singular to refer to the glowing charcoal/ember material in a general or collective way, not just to one single ember. So la brasa can sound natural even if there is more than one glowing piece.

Depending on context, las brasas is also possible, but la brasa is very common when referring to the firebed or glowing coals as a whole.

The article la is used because the speaker means the specific embers/coals that are already there in the situation. Spanish often uses the definite article where English might use the, or sometimes where English is less explicit.

So la brasa means something like the embers / the glowing coals already known from context.

Avivar means to make something stronger, livelier, or more active. With fire or embers, it means to stir them up, fan them, or get them burning more strongly.

So compared with a very general verb like hacer, avivar is more specific: it is about bringing the heat or flame back up.

Not necessarily. In Spanish, the imperative is used very naturally for requests and instructions, especially in practical situations. It is not automatically rude.

Adding por favor makes it more polite:

• Aviva la brasa, por favor.

In context, this can sound perfectly normal and courteous.

To address someone formally (usted), you would say:

• Avive la brasa, por favor.

So the contrast is:

• tú: Aviva la brasa
• usted: Avive la brasa

This is a very common difference in Spanish commands.

Yes. Por favor is flexible in Spanish. These are all natural:

• Aviva la brasa, por favor.
• Por favor, aviva la brasa.
• Aviva, por favor, la brasa.

The first two are especially common. The meaning stays the same; the difference is mainly one of rhythm and emphasis.

A simple pronunciation guide is:

• aviva ≈ ah-BEE-bah
• la ≈ lah
• brasa ≈ BRAH-sah

A few useful notes:

• The stress is on vi in aviva: a-VI-va
• The stress is on bra in brasa: BRA-sa
• In Spanish, v is pronounced very similarly to b

So the full phrase is roughly: ah-BEE-bah lah BRAH-sah

Usually not with exactly the same nuance. Encender means to light / ignite, while avivar means to make stronger, revive, or stir up a fire that already exists.

So if the embers are already there but weak, avivar is the better verb. If there is no fire yet and you want someone to light it, encender would make more sense.

Spanish often uses the imperative directly for practical requests:

• Aviva la brasa, por favor.

English learners sometimes expect a softer structure like Can you...?, but Spanish does not need that structure as often. A direct command plus por favor is very normal.

Of course, Spanish can also soften the request in other ways, for example:

• ¿Puedes avivar la brasa?
• ¿Podrías avivar la brasa?

But the imperative version is completely natural.

Yes, it fits Spain Spanish perfectly, although it would also be understood elsewhere. If you were speaking to one person informally in Spain, aviva la brasa is exactly the kind of imperative form you would expect.

In parts of Latin America, the choice of informal command might change depending on whether the speaker uses tú, vos, or usted, but the sentence itself is not strange or uniquely limited to Spain.