Polaznik će upisati teorijski kurs.

Polaznik means participant, attendee, or learner in the sense of someone who is taking a course or training program. It comes from the verb polaziti, which can mean to attend or to go to regularly in some contexts.

So in this sentence, polaznik is the person who will enroll in the course.

This is the future tense in Serbian.

A very common way to form the future is:

subject + će + infinitive

So:

• polaznik = the participant
• će = will
• upisati = enroll / sign up

Together, će upisati means will enroll.

Because Serbian verbs often come in aspect pairs:

• upisati = perfective: to enroll, to complete the act of enrolling
• upisivati = imperfective: to be enrolling, to enroll repeatedly, or to focus on the process/habit

In this sentence, the idea is a single completed future action: the participant will enroll. That is why upisati is the natural choice.

If you used upisivati, it would usually suggest a repeated or ongoing action, which does not fit as well here.

Here upisati means something like:

• to enroll in
• to sign up for
• to register for

Literally, the verb can also have related meanings like to write in, to enter, or to record, depending on context. But with a course, it means to enroll in it.

Because the adjective teorijski must agree with the noun kurs in:

• gender
• number
• case

Kurs is:

• masculine
• singular

So the adjective also appears in the masculine singular form:

• teorijski = theoretical
• kurs = course

Together: teorijski kurs = theoretical course

Because kurs is a masculine inanimate noun.

In Serbian, masculine inanimate nouns usually have:

• the same form in the nominative singular
• and the accusative singular

Since kurs is the direct object of upisati, it is in the accusative, but it looks the same as the nominative:

• nominative: kurs
• accusative: kurs

That is completely normal.

For the same reason. The adjective agrees with kurs, and since the accusative singular of masculine inanimate nouns looks like the nominative, the adjective also stays in the same-looking form:

• nominative: teorijski kurs
• accusative: teorijski kurs

So even though the phrase is the object of the verb, it does not visibly change.

Yes, polaznik is grammatically masculine. If you wanted to refer specifically to a female participant, you would usually say polaznica.

So:

• Polaznik će upisati teorijski kurs. = a male participant / participant in a generic masculine form
• Polaznica će upisati teorijski kurs. = a female participant

In many contexts, Serbian may use the masculine form generically, especially in formal or administrative language.

Yes, Serbian often allows the subject to be omitted because the verb form can make the meaning clear from context. But in this sentence, polaznik is included for clarity and emphasis.

Without it, you could say:

Upisaće teorijski kurs.

That means He/She will enroll in the theoretical course, depending on context.

Including polaznik makes it explicit who is doing the action.

This is a very natural and standard word order in Serbian:

Subject + future particle + infinitive + object

So:

• Polaznik = subject
• će upisati = future verb phrase
• teorijski kurs = object

Serbian word order is more flexible than English, so other orders are possible for emphasis, but this one is neutral and standard.

Yes, in some varieties and styles, especially in everyday speech, you may also hear a structure with da:

Polaznik će da upiše teorijski kurs.

This also means The participant will enroll in the theoretical course.

So both are possible:

• će upisati
• će da upiše

The version in your sentence, će upisati, is very standard and common.

No. Kurs is very common, but you may also encounter tečaj in some regions or styles, especially in Croatian and sometimes in other varieties.

In Serbian, kurs is very natural and widely used, especially in education, training, and administration.

A rough pronunciation guide is:

Polaznik će upisati teorijski kurs
po-LAZ-nik chye oo-pee-SAH-tee teh-oh-REE-skee koors

A few helpful notes:

• č sounds roughly like ch in church
• ć is softer than č, but for beginners it is often approximated as a softer ch
• š sounds like sh
• Serbian stress is not usually marked in ordinary writing, so learners normally pick it up through listening

It sounds fairly neutral to formal, and it would fit well in contexts like:

• school or training program descriptions
• administrative instructions
• brochures
• official websites

The choice of words like polaznik and upisati kurs is especially common in educational or institutional language.