Bevo una birra a cena.

Bevo is the 1st person singular form of the verb bere = to drink.

So:

• bere = to drink
• bevo = I drink / I am drinking

This is an irregular verb, so it does not follow the most basic -ere pattern exactly.

A few present-tense forms are:

• io bevo = I drink
• tu bevi = you drink
• lui/lei beve = he/she drinks
• noi beviamo = we drink
• voi bevete = you all drink
• loro bevono = they drink

In Italian, subject pronouns are often left out because the verb ending already shows who the subject is.

• bevo already means I drink
• so io is optional

You would add io mainly for:

• emphasis
• contrast
• clarity

For example:

• Io bevo una birra, lui beve vino. = I’m drinking a beer, he’s drinking wine.

So Bevo una birra a cena is completely natural.

It can mean either one, depending on context.

Italian present tense often covers both:

• I drink
• I am drinking

So Bevo una birra a cena could mean:

• I drink a beer at dinner (habit / usual action)
• I’m drinking a beer at dinner (right now, depending on context)

If the sentence is given alone, many learners understand it first as a general statement or habit, but context decides.

Una birra means a beer — one beer, a specific unit or serving.

• bevo una birra = I drink a beer
• bevo birra = I drink beer

The difference is similar to English:

• I drink a beer = one beer
• I drink beer = beer in general

So here, una is the indefinite article meaning a/an, and it matches the feminine noun birra.

Because birra is a feminine noun in Italian.

That is why it takes:

• una birra = a beer
• la birra = the beer

This grammatical gender does not mean beer is “female” in a real-world sense. It just means the noun belongs to the feminine grammatical category, and articles/adjectives must agree with it.

A cena is a very common fixed expression meaning at dinner or for dinner / at dinnertime.

With meals, Italian often uses:

• a colazione = at breakfast
• a pranzo = at lunch
• a cena = at dinner

So you usually do not use the article here.

Alla cena is possible, but it usually refers to a specific dinner event:

• alla cena di Natale = at the Christmas dinner
• alla cena di ieri sera = at last night’s dinner

In your sentence, a cena means dinner in the general mealtime sense.

It can overlap with several English expressions.

A cena most naturally refers to the dinner mealtime/context, so depending on translation style it may be:

• at dinner
• during dinner
• sometimes for dinner

The exact English choice depends on the situation.

For example:

• Bevo una birra a cena.
  could be understood as
  I drink a beer at dinner / with dinner

In many contexts, English speakers might naturally say with dinner even though the Italian is a cena.

Yes, A cena bevo una birra is also correct.

Italian word order is often more flexible than English. The original sentence:

• Bevo una birra a cena

is a neutral, natural order.

But you can move a cena earlier if you want to highlight the time:

• A cena bevo una birra. = At dinner, I drink a beer.

Both are grammatical. The difference is mostly about focus and emphasis, not basic meaning.

In Italian, the verb bere takes a direct object, so no extra preposition is needed before the thing being drunk.

• bevo una birra = I drink a beer
• bevo acqua = I drink water
• bevo vino = I drink wine

If you wanted to express with dinner, Italian might use another structure, for example:

• Bevo una birra con la cena = I drink a beer with dinner

But a cena is already a very natural way to place the action in the dinner context.

Yes. Very easily.

Without extra context, Bevo una birra a cena often sounds like:

• something I usually do
• a routine
• a general statement

For example:

• Ogni sera bevo una birra a cena. = Every evening I drink a beer at dinner.

But it can also describe what is happening now if the situation makes that clear.

It might, but it means something slightly different.

• bevo una birra = I drink a beer
• prendo una birra = I have / take / order a beer

Prendere is often used in everyday Italian when talking about food and drink, especially in the sense of choosing or ordering something.

So:

• A cena prendo una birra. = At dinner, I have/order a beer.
• A cena bevo una birra. = At dinner, I drink a beer.

Both are natural, but bere focuses more directly on the act of drinking.

A simple pronunciation guide is:

BEH-vo OO-na BEER-ra a CHEH-na

A few notes:

• bevo: beh-vo
• una: oo-na
• birra: the rr is rolled or tapped
• cena: the ce sounds like che in check, so CHEH-na

In IPA, a standard pronunciation is approximately:

/ˈbe.vo ˈuː.na ˈbir.ra a ˈtʃeː.na/

Usually, a cena is more natural here.

• a cena = at dinner / at dinnertime
• per cena = for dinner

Per cena is possible, but it often emphasizes what you are having for dinner, almost as the dinner choice itself.

For example:

• Per cena mangio pasta. = For dinner I eat pasta.

With your sentence, Bevo una birra a cena is the most idiomatic everyday version for I drink a beer at dinner.