Kupac čita zanimljiv opis.

Kupac means buyer or customer. In this sentence, it is the subject, so it is in the nominative singular.

• kupac = the buyer / a buyer
• It is masculine singular.

Serbian does not use a or the, so kupac can mean either a buyer or the buyer, depending on context.

Čita means reads or is reading, depending on context.

It is the 3rd person singular present tense form of the verb čitati = to read.

So:

• ja čitam = I read / I am reading
• ti čitaš = you read
• on/ona/ono čita = he/she/it reads

In this sentence, kupac čita = the buyer reads / is reading.

Zanimljiv means interesting. It describes opis, so it must agree with it in:

• gender
• number
• case

Here, opis is:

• masculine
• singular
• accusative (direct object)

Because opis is a masculine inanimate noun, its accusative form looks the same as the nominative. So the adjective also stays in the matching masculine singular form:

• zanimljiv opis = an interesting description

Opis is in the accusative singular because it is the direct object of the verb čita.

The buyer is doing the action of reading, and opis is the thing being read.

So:

• kupac = subject, nominative
• čita = verb
• opis = direct object, accusative

A useful point: for masculine inanimate nouns, the accusative singular is usually the same as the nominative singular. That is why you see opis, not a different ending.

Because opis is a masculine inanimate noun.

In Serbian:

• masculine animate nouns usually change in the accusative singular
• masculine inanimate nouns usually do not

For example:

• kupac (animate) → accusative kupca
• opis (inanimate) → accusative opis

So in this sentence, zanimljiv opis is accusative, even though it looks like nominative.

Serbian normally does not use articles.

So:

• kupac can mean a buyer or the buyer
• opis can mean a description or the description

The exact meaning depends on context.

English learners often expect a separate word like the, but Serbian simply does not need one in most situations.

Yes. Serbian word order is more flexible than English word order because case endings help show who is doing what.

The neutral order here is:

• Kupac čita zanimljiv opis.

But other orders are possible, for example:

• Zanimljiv opis kupac čita.
• Čita kupac zanimljiv opis.

These can sound more marked or emphasize different parts of the sentence. The most natural basic version for a learner is still:

• Kupac čita zanimljiv opis.

The letter č is pronounced roughly like ch in church, but usually a bit firmer.

So:

• čita sounds approximately like CHEE-tah
• kupac is approximately KOO-pats
• opis is approximately OH-pees
• zanimljiv is approximately zah-NEEM-lyiv or zah-NIM-lyiv, depending on how carefully it is pronounced

A key point for learners: č and ć are different letters in Serbian, although many beginners do not hear the difference clearly at first.

It can be either.

The Serbian present tense often covers both:

• habitual meaning: The buyer reads an interesting description
• ongoing meaning: The buyer is reading an interesting description

Context tells you which one is meant.

If you only see the sentence by itself, both translations are possible.

Here are the basic dictionary forms:

• kupac = buyer, customer
• čitati = to read
• zanimljiv = interesting
• opis = description

In the sentence:

• kupac is already in its basic singular form
• čita comes from čitati
• zanimljiv is the masculine singular form of the adjective
• opis is also in its basic singular form, although here it functions as accusative

Not in this sentence, if kupac is the subject.

You need kupac because the subject must be in the nominative:

• Kupac čita zanimljiv opis. = correct

Kupca is usually an accusative or genitive form, not nominative, so it would not work as the subject here.

For example:

• Vidim kupca. = I see the buyer.

There, kupca is correct because the buyer is the object, not the subject.