Dovešću prijatelja u policijsku stanicu.

Dovešću means I will bring or I will lead/escort.

It comes from the verb dovesti, which is a perfective verb. In this sentence, it is in the 1st person singular future:

• dovesti = to bring, to lead someone to a place
• dovešću = I will bring

This verb is usually used for bringing a person somewhere, often by accompanying them.

In Serbian, the subject pronoun is often left out when the verb already shows who is doing the action.

So:

• Dovešću already means I will bring
• adding ja would only be for emphasis

Compare:

• Dovešću prijatelja... = I will bring a friend/the friend...
• Ja ću dovesti prijatelja... = I will bring a friend/the friend... (more emphasis on I)

Because prijatelja is in the accusative case.

The word prijatelj is a masculine animate noun, and masculine animate nouns usually change in the accusative singular:

• prijatelj = nominative
• prijatelja = accusative

Since prijatelja is the direct object of dovešću (the person being brought), the accusative is required.

It can mean either a friend or the friend, depending on context.

Serbian does not have articles like a and the, so the sentence by itself does not specify that.

So Dovešću prijatelja could mean:

• I’ll bring a friend
• I’ll bring the friend
• sometimes even I’ll bring my friend, if the context makes that clear

Context tells you which one is meant.

Because u can mean into/to or in, depending on the case.

Here, the sentence describes movement toward a destination, so u takes the accusative:

• u policijsku stanicu = to the police station

If it meant location, as in in the police station, it would use the locative:

• u policijskoj stanici = in the police station

So:

• movement → u + accusative
• location → u + locative

Because adjectives must agree with the noun they describe in gender, number, and case.

The noun is:

• stanica = station
  
  • feminine singular

Since it is here in the accusative singular, the adjective must match it:

• policijska stanica = police station (nominative)
• policijsku stanicu = police station (accusative)

So both words change together.

Yes, dovesti is a very natural choice when you mean bringing a person somewhere, especially by accompanying or leading them.

For example:

• dovesti prijatelja = bring a friend
• dovesti dete u školu = bring a child to school

If you were talking about bringing an object, you would more often use doneti:

• Doneću knjigu. = I’ll bring the book.

So a useful distinction is:

• dovesti → bring/lead a person or animal
• doneti → bring/carry an object

Voditi is usually imperfective, while dovesti is perfective.

That means:

• voditi focuses more on the process or repeated action: to lead / be leading / take
• dovesti focuses on completing the action: to bring someone to a destination

So:

• Vodim prijatelja u policijsku stanicu. = I am taking / I take a friend to the police station.
• Dovešću prijatelja u policijsku stanicu. = I will bring the friend/a friend to the police station.

Because the sentence is about a single completed future action, dovešću fits very well.

This is the normal way many Serbian future forms are written with verbs like dovesti.

The future is formed with the auxiliary ću:

• ja ću dovesti = I will bring

But very often, especially in standard written Serbian, the auxiliary attaches to the verb form and becomes:

• dovešću

So this is just the compact future form of ja ću dovesti.

Both forms are related, but dovešću is the standard single-word future form you should learn here.

Yes. Serbian word order is fairly flexible, although the most neutral order here is:

• Dovešću prijatelja u policijsku stanicu.

You could also say:

• Prijatelja ću dovesti u policijsku stanicu.
• U policijsku stanicu dovešću prijatelja.

These versions shift the focus or emphasis:

• starting with prijatelja emphasizes the friend
• starting with u policijsku stanicu emphasizes the destination

So the meaning stays basically the same, but the information focus changes.

Grammatically, it is neutral: I will bring a friend/the friend to the police station.

But because the destination is the police station, the sentence may sound serious depending on context. It could imply:

• escorting someone there
• taking someone there for questioning
• bringing someone there to report something

That nuance comes mostly from the situation, not from the grammar itself.