Сегодня в офисе учебная тревога.

Russian often leaves out to be in the present tense.

So this sentence literally looks like:

• Сегодня — today
• в офисе — in the office
• учебная тревога — a drill / training alarm

But the full sense is something like:

• Today, there is a drill in the office
• Today, the office has a drill
• Today, there’s a practice alarm in the office

In present-tense Russian, you normally do not say есть in this kind of sentence. Using no verb here is completely normal.

Because after в meaning in, Russian usually uses the prepositional case for location.

So:

• офис = office
• в офисе = in the office / at the office

This is a very common pattern:

• в доме — in the house
• в школе — at school / in the school
• в магазине — in the store

If в means movement into somewhere, then Russian usually uses the accusative instead:

• в офис — into the office

But here the meaning is location, not movement, so в офисе is correct.

Because тревога is a feminine noun, and the adjective has to agree with it.

Russian adjectives change form to match the noun in:

• gender
• number
• case

Here:

• тревога is feminine singular
• so учебный becomes учебная

Compare:

• учебный план — training/study plan (masculine)
• учебная тревога — drill, training alarm (feminine)
• учебное задание — учебное for a neuter noun

So учебная is just the feminine form matching тревога.

No. Even though the parts might tempt you to analyze it that way, учебная тревога is a set phrase.

In this context it means something like:

• drill
• practice alarm
• emergency drill
• training alert

The adjective учебный / учебная often means training, practice, or for instruction, not only academic or study-related.

And тревога here means alarm/alert, not just the emotional feeling of anxiety.

So together, учебная тревога means a planned practice emergency alarm, such as a fire drill or evacuation drill.

Because it is the main noun phrase of the sentence.

This is a typical Russian sentence pattern where the subject or main item is in the nominative, even though English might use there is:

• Сегодня в офисе учебная тревога.
• literally: Today in the office [is] a drill.

Russian does not need a separate there is construction the way English often does. The thing that exists or is happening can simply stand in the nominative.

So:

• учебная тревога = nominative singular
• it is the central thing being stated

Yes, the word order is flexible.

You could also hear:

• В офисе сегодня учебная тревога.
• Учебная тревога сегодня в офисе.
• Сегодня учебная тревога в офисе.

All of these are grammatical. The differences are mostly about focus and emphasis.

The original sentence:

• Сегодня в офисе учебная тревога

sounds natural and neutral, with the flow:

1. time — today
2. place — in the office
3. main event — there is a drill

Russian often moves words around to highlight what is new, important, or contrastive.

It can correspond to either one in English, depending on context.

Russian в офисе literally means in the office, but in real usage English might translate it as:

• in the office
• at the office

For example:

• Сегодня в офисе учебная тревога could naturally be rendered as
  • Today there’s a drill in the office
  • Today there’s a drill at the office

Russian does not make exactly the same distinction here that English sometimes does.

Russian has no articles.

So учебная тревога can mean:

• a drill
• the drill

Which one is intended depends on context.

In this sentence, English will usually choose a drill unless the context has already established a specific one.

This is something English speakers often need to get used to: Russian leaves definiteness unstated unless something else makes it clear.

Yes. Сегодня is very movable.

Possible placements include:

• Сегодня в офисе учебная тревога.
• В офисе сегодня учебная тревога.
• Учебная тревога сегодня в офисе.

Putting Сегодня first is very common when you want to frame the whole sentence by time: As for today...

English speakers sometimes expect one fixed word order, but Russian is much freer, especially with adverbs like сегодня.

It can mean both, depending on context.

тревога can mean:

1. alarm / alert
2. anxiety / worry

In учебная тревога, the meaning is definitely alarm/drill, not the emotional state.

Context and collocation matter a lot in Russian. For example:

• испытывать тревогу — to feel anxiety
• объявить тревогу — to sound/declare an alarm
• учебная тревога — practice alarm, drill

So this sentence is about an organized alert exercise, not someone feeling nervous.

The main stress is:

• сего́дня
• в офи́се
• уче́бная
• трево́га

A rough pronunciation guide:

• Сегодня — sye-VOD-nya
• в офисе — v a-FEE-sye
• учебная — u-CHEB-na-ya
• тревога — try-VO-ga

A natural rhythm would be something like:

Сего́дня в офи́се уче́бная трево́га.

For learners, the most important thing is to keep the stress in the right place, especially in:

• офи́се
• трево́га

because stress is unpredictable in Russian and can affect how natural you sound.