После ужина мы болтаем на кухне.

Because после is a preposition that requires the genitive case.

• ужин = dinner (dictionary form, nominative)
• ужина = genitive singular

So:

• после ужина = after dinner

This is a very common pattern in Russian:

• после работы = after work
• после школы = after school
• после фильма = after the film

Ужина is in the genitive singular.

The noun is:

• nominative: ужин
• genitive: ужина

It is genitive because of the preposition после.

Yes, Russian can often omit the subject pronoun if it is clear from the verb ending.

• болтаем already means we chat / we are chatting
• so После ужина болтаем на кухне is possible in conversation

Including мы makes the subject more explicit. It can sound more natural if you want to emphasize we, contrast with someone else, or simply make the sentence clearer for learners.

So both are possible:

• После ужина мы болтаем на кухне.
• После ужина болтаем на кухне.

Болтаем comes from болтать, which means to chat, to talk casually, or to chit-chat.

It usually suggests informal, relaxed conversation, not serious discussion.

So мы болтаем is like:

• we chat
• we talk
• we sit around talking

It is less formal than verbs like:

• говорить = to speak, talk
• разговаривать = to converse, talk

Болтаем is the 1st person plural present tense form of болтать.

Conjugation:

• я болтаю = I chat
• ты болтаешь = you chat
• он/она болтает = he/she chats
• мы болтаем = we chat
• вы болтаете = you chat
• они болтают = they chat

The ending -ем tells you it means we.

It can mean either, depending on context.

Russian present tense often covers both:

• we chat (habitual / general)
• we are chatting (right now)

In this sentence, without extra context, it often sounds like a habitual action:

• After dinner, we chat in the kitchen.

But it could also describe what is happening now, depending on the situation.

In Russian, the normal expression is на кухне = in the kitchen / in the kitchen area.

This is just how Russian idiom works. Some places use в, some use на, and learners usually need to memorize the standard choice.

For example:

• в комнате = in the room
• в доме = in the house
• на кухне = in the kitchen
• на работе = at work
• на улице = outside / in the street

So although English says in the kitchen, Russian usually says на кухне.

Кухне is in the prepositional case.

The noun is:

• nominative: кухня
• prepositional: на кухне

It is prepositional because it follows на in a location meaning:

• на кухне = in the kitchen

Compare:

• на кухню = to the kitchen (accusative, direction)
• на кухне = in the kitchen (prepositional, location)

Because of the case.

With на:

• accusative usually shows movement toward a place
• prepositional usually shows location in/at a place

So:

• идём на кухню = we are going to the kitchen
• сидим на кухне = we are sitting in the kitchen
• болтаем на кухне = we are chatting in the kitchen

Here кухне is prepositional, so it clearly means location.

Yes, Russian word order is fairly flexible, though different orders sound slightly different in emphasis.

Neutral order:

• После ужина мы болтаем на кухне.

Other possible orders:

• Мы после ужина болтаем на кухне.
• На кухне мы болтаем после ужина.
• После ужина на кухне мы болтаем.

These all keep roughly the same basic meaning, but the focus changes a little. The original sentence is a very natural, neutral way to say it.

Yes. Russian usually does not have articles like a or the, so ужина by itself does not tell you that.

Depending on context, после ужина could mean:

• after dinner
• after the dinner
• after having dinner

In many everyday situations, English would naturally translate it simply as after dinner.

A simple pronunciation guide:

• После ужина мы болтаем на кухне
• roughly: POS-lye OO-zhi-na my bal-TA-yim na KOOKH-nye

A few helpful notes:

• после sounds roughly like POS-lye
• ужина has stress on the first syllable: Úжина
• болтаем has stress on та: болтАем
• кухне has the rough Russian х sound, like the ch in Scottish loch

Usually yes, if you mean informal, relaxed talking.

But it can sometimes also suggest chatting away, babbling, or talking idly, depending on tone and context.

If you want a more neutral verb, you could use:

• разговаривать = to converse, talk
• говорить = to speak, talk

So:

• После ужина мы болтаем на кухне sounds casual and natural
• После ужина мы разговариваем на кухне sounds a bit more neutral or formal

Most naturally, it sounds like a habit or a regular routine:

• After dinner, we chat in the kitchen.

That is because the present tense of an imperfective verb like болтать often describes repeated or usual actions.

If you wanted to make it clearly about right now, Russian would usually rely on context, or add words like:

• сейчас = now
• как раз = just now / right at this moment

But the sentence itself can still mean either habitual or present, depending on context.