Radimo u istoj kancelariji.

Radimo is the 1st person plural present tense of raditi, which means to work.

So radimo means:

• we work
• we are working

In Serbian, the present tense often covers both the simple present and the present continuous, depending on context.

Examples:

• Radimo svaki dan. = We work every day.
• Radimo sada. = We are working now.

Because in Serbian, the verb ending already shows who is doing the action.

• radim = I work
• radiš = you work
• radi = he/she/it works
• radimo = we work
• radite = you plural / formal work
• rade = they work

So Radimo already means we work, and the pronoun mi is usually unnecessary.

You could say Mi radimo u istoj kancelariji, but that would add emphasis, something like We work in the same office.

Kancelariji is in the locative singular.

That happens because the preposition u means in or at, and when it refers to a location, it usually requires the locative case.

So:

• nominative: kancelarija = office
• locative: u kancelariji = in the office

In this sentence, the meaning is location, so Serbian uses the locative:

• u istoj kancelariji = in the same office

Because istoj has to agree with kancelariji in:

• gender
• number
• case

The noun kancelarija is:

• feminine
• singular
• here in the locative

So the adjective isti (same) must also be feminine singular locative:

• nominative feminine: ista
• locative feminine: istoj

That is why the sentence says:

• u istoj kancelariji

The dictionary form is isti, meaning same.

Like many Serbian adjectives, it changes form depending on the noun it describes.

A few forms of isti are:

• isti čovek = the same man
• ista kancelarija = the same office
• isto mesto = the same place
• u istoj kancelariji = in the same office

So istoj is just one grammatical form of isti.

Not always. U can mean in, into, or sometimes at, depending on context.

The important grammar point is:

• u + locative = location (in / at)
• u + accusative = movement toward (into)

Compare:

• Radimo u kancelariji. = We work in the office.
  (location, so locative)

• Ulazimo u kancelariju. = We are going into the office.
  (movement, so accusative)

In your sentence, it is about where the action happens, so u means in and takes the locative.

Usually kancelarija means a physical office or office room.

In Radimo u istoj kancelariji, the most natural meaning is that the people work in the same office space.

If you want to say workplace in a broader sense, Serbian might use other expressions depending on context, such as:

• na istom radnom mestu = at the same workplace / in the same position
• u istoj firmi = in the same company

So kancelarija is specifically office here.

No, Serbian word order is fairly flexible.

The neutral, natural order here is:

• Radimo u istoj kancelariji.

But you could also say:

• U istoj kancelariji radimo.
• Mi radimo u istoj kancelariji.

These alternatives may sound more emphatic or context-driven.

For example:

• U istoj kancelariji radimo, ne u istoj školi.
  = We work in the same office, not in the same school.

So the original sentence is the most neutral version, but not the only possible one.

The verb raditi is imperfective.

That makes sense because working is viewed as an ongoing, repeated, or general activity.

In the present tense, Serbian normally uses imperfective verbs for current or habitual actions. So:

• Radimo u istoj kancelariji. = We work / are working in the same office.

A perfective verb usually would not be used like this for a normal present-tense statement about ongoing work.

So yes, it matters, but in this sentence raditi is exactly the expected choice.

One helpful clue is its ending: many Serbian nouns ending in -a are feminine.

So:

• kancelarija = feminine

That matters because adjectives must agree with it:

• ista kancelarija = the same office
• u istoj kancelariji = in the same office

If the noun were masculine or neuter, the adjective form would be different.

Not by itself. The sentence specifically says Radimo, which means we work.

So the meaning is:

• We work in the same office

If you wanted to say We are in the same office, you would usually say something like:

• U istoj smo kancelariji.

That sentence focuses on location, not on working.

So even though the office location is part of both sentences, Radimo makes the meaning clearly about working.

You can emphasize same with stress in speech, but grammatically the sentence often stays the same:

• Radimo u istoj kancelariji.

If you want stronger contrast, Serbian often uses context or added words, for example:

• Radimo baš u istoj kancelariji. = We work in exactly the same office.
• Mi radimo u istoj kancelariji. = We work in the same office.
  (with emphasis on we)

So the original sentence is already correct; emphasis usually comes from intonation, context, or an extra word like baš.

In many contexts, yes, but the nuance can vary.

You may hear:

• Radimo u istoj kancelariji.
• Radimo u istom uredu.

Both can mean We work in the same office.

However, usage depends on region and style:

• kancelarija is very common
• ured is also used, especially in some regional standards

If you are learning Serbian as used in Serbia, kancelarija is a very natural choice.