Na tržnici prodaju voće i povrće.

Croatian usually says na tržnici for at the market / in the marketplace.

This is one of those location expressions that you mostly learn as a fixed pattern:

• na tržnici = at the market
• na poslu = at work
• na fakultetu = at university/college

Even though English often uses in, Croatian prefers na here.

Because na here expresses location, and location after na usually takes the locative case.

So:

• base form: tržnica = market
• locative singular: tržnici
• therefore: na tržnici = at the market

This is a very common pattern:

• škola → u školi
• ulica → na ulici
• tržnica → na tržnici

Prodaju is the 3rd person plural form of prodavati/prodati in the present tense, so it means:

• they sell
• or more naturally here: people sell

In this sentence, the subject is not stated explicitly. Croatian often leaves out subject pronouns when the verb ending already shows who is involved.

So prodaju by itself already tells you it is they.

In context, this sentence has a general meaning:

• At the market, people sell fruit and vegetables.

It does not necessarily mean a specific known group of people.

Because Croatian is a pro-drop language, which means subject pronouns are often omitted.

The verb ending already gives the person and number:

• prodajem = I sell
• prodaješ = you sell
• prodaje = he/she sells
• prodajemo = we sell
• prodajete = you (plural/formal) sell
• prodaju = they sell

So adding oni would usually only be done for emphasis or contrast.

They are in the accusative case, because they are the direct objects of prodaju.

In this sentence:

• prodaju što? = what do they sell?
• answer: voće i povrće

For these two nouns, the nominative and accusative forms are the same:

• voće = fruit
• povrće = vegetables

They are often treated as mass/collective nouns, much like English fruit or vegetation/produce, so they do not work exactly like regular countable plurals.

The most natural English translation is usually fruit and vegetables.

In Croatian:

• voće is a collective noun meaning fruit
• povrće is a collective noun meaning vegetables

So even though the Croatian words are singular in form, the idea is broad and general. English normally expresses that as fruit and vegetables.

It is the present tense.

But the sentence does not have to mean only right now, at this moment. Present tense in Croatian, like in English, can also express:

• a general fact
• a habitual action
• something typically done in a place

So this sentence is best understood as a general statement:

• At the market, people sell fruit and vegetables.

Croatian word order is fairly flexible, but this order sounds natural because it starts with the place and then gives the action.

Structure here:

• Na tržnici = place/topic
• prodaju = verb
• voće i povrće = object

It feels like:

• At the market, they sell fruit and vegetables.

Other word orders are possible, but they may change emphasis:

• Voće i povrće prodaju na tržnici. = emphasizes fruit and vegetables
• Prodaju voće i povrće na tržnici. = more neutral but slightly different rhythm

Usually it means the market as a type of place, not necessarily one specific named market.

Croatian often uses a singular noun in expressions like this to talk about a general location:

• Na tržnici = at the market / in the marketplace

Depending on context, it could also refer to one particular market, but without more context, the sentence sounds like a general statement about what happens at markets.

Roughly: trzh-nee-tsee

A few helpful notes:

• ž sounds like the s in measure
• c sounds like ts
• stress can vary by dialect and teaching style, but the main challenge for English speakers is usually the consonants

So:

• tržnica ≈ trzh-nee-tsa
• tržnici ≈ trzh-nee-tsee

It can be associated with both, depending on how you analyze aspect, because present-tense forms can look the same in some verb pairs.

For learners, the key idea is:

• prodavati = imperfective, to sell in an ongoing/habitual sense
• prodati = perfective, to sell in the sense of completing a sale

In a general sentence like this, the meaning is habitual/general, so the idea fits prodavati best:

• Na tržnici prodaju voće i povrće. = At the market, they sell fruit and vegetables.

That is the aspect you should probably associate with this sentence.