Agent radi u kancelariji.

Radi is the 3rd person singular present tense of the verb raditi, meaning to work.

So:

• raditi = to work
• ja radim = I work
• ti radiš = you work
• on/ona radi = he/she works

In this sentence, Agent radi means The agent works or An agent works, depending on context.

Serbian usually does not need a subject pronoun when the verb ending already shows the person.

Because radi already means he/she/it works, Serbian can simply say:

• Agent radi.

If you added a pronoun, it would usually be for emphasis or contrast:

• On radi u kancelariji. = He works in the office.

But in a normal neutral sentence, the noun agent is enough.

Serbian does not have articles like English a/an and the.

So agent can mean:

• an agent
• the agent

and kancelariji can mean:

• in an office
• in the office

The exact meaning depends on context.

Because the preposition u changes the case of the noun.

Here, u means in, expressing a location, so the noun goes into the locative case.

• base form: kancelarija = office
• locative singular: kancelariji = in the office

So:

• u kancelariji = in the office

You cannot say u kancelarija here, because that would leave the noun in the wrong form.

Kancelariji is in the locative singular.

The locative is used after certain prepositions when talking about a fixed location, including:

• u = in
• na = on, at
• o = about
• po = by, around, after, depending on context

Since the sentence says where the agent works, Serbian uses:

• u + locative → u kancelariji

No. U can take two different cases, depending on the meaning:

• u + locative = being in a place
• u + accusative = movement into a place

Compare:

• Agent radi u kancelariji. = The agent works in the office.
  (location, no movement)

• Agent ulazi u kancelariju. = The agent is going into the office.
  (movement toward the inside)

So in your sentence, kancelariji is used because the meaning is static location.

Yes, agent is grammatically masculine.

In Serbian, profession nouns often have grammatical gender. A male agent is naturally:

• agent

For a female agent, you may hear:

• agentkinja

However, actual usage can vary depending on context, profession, and style. In many situations, the masculine form may still be used generically, but if you want to specify a woman, agentkinja is a common feminine form.

So:

• Agent radi u kancelariji. = a male agent / an agent in a general sense
• Agentkinja radi u kancelariji. = a female agent works in the office

Yes. Serbian word order is more flexible than English word order because noun endings and verb forms carry a lot of grammatical information.

The most neutral order here is:

• Agent radi u kancelariji.

But other orders are possible, for example:

• U kancelariji radi agent.
• Radi agent u kancelariji.

These versions can sound more marked or place emphasis on a different part of the sentence. For a beginner, it is best to learn the neutral pattern first:

• subject + verb + place

A simple pronunciation guide:

• agent ≈ AH-ghent
• radi ≈ RAH-dee
• u ≈ oo
• kancelariji ≈ kan-tseh-LAH-ree-yee

A few useful points:

• Serbian r is rolled or tapped.
• j is pronounced like English y in yes.
• Serbian spelling is very regular, so words are usually pronounced as written.

So kancelariji has that -ji sound at the end, like yee.

Not only. Raditi often means to work, but it can also mean to function or sometimes to do/make in certain contexts.

Examples:

• On radi u banci. = He works in a bank.
• Mašina radi. = The machine is working / functioning.
• Šta radiš? = What are you doing?

In your sentence, because the subject is agent and the phrase u kancelariji gives a workplace, the meaning is clearly works.

The negative is made with ne before the verb:

• Agent ne radi u kancelariji. = The agent does not work in the office.

With many Serbian verbs, ne is written separately from the verb, and raditi follows that pattern:

• radi → ne radi

Yes. Kancelarija can mean a physical office room, but depending on context it can also refer more broadly to an office as a workplace or administrative office.

So u kancelariji might mean:

• in the office room
• at the office
• in the office workplace

Context tells you which exact shade of meaning is intended.

You usually know from context, not from articles, because Serbian has no a/an/the.

So Agent radi u kancelariji could be understood in different ways:

• The agent works in the office.
• An agent works in an office.
• The agent is working in the office.

If the speaker wants to make things more specific, Serbian can add other words, such as demonstratives or context markers:

• Taj agent radi u toj kancelariji. = That agent works in that office.

But the basic sentence leaves article-like information unstated.