Produžiće rok pozajmice pod uslovom da je dostupnost potvrđena.

Produžiće is the future tense of the verb produžiti (to extend, to prolong).

A useful thing to know is that this form can mean either:

• he/she/it will extend
• they will extend

That is because in Serbian, the 3rd person singular and 3rd person plural future can look the same when the subject is not stated.

Compare:

• On će produžiti / Produžiće = He will extend
• Oni će produžiti / Produžiće = They will extend

So you understand the exact subject from context.

Serbian often drops subject pronouns when they are not needed. The verb form and the context usually give enough information.

So instead of saying:

• On će produžiti rok pozajmice...

Serbian can simply say:

• Produžiće rok pozajmice...

This is completely normal. English usually needs the subject, but Serbian often does not.

It comes from the verb produžiti plus the future auxiliary će.

In Serbian, future tense can be built in two common ways:

• će produžiti
• produžiće

Both are standard.

With many verbs, especially in neutral written style, you will often see the fused form:

• produžiće

This is basically the future auxiliary attached to the verb.

Rok is in the accusative singular, because it is the direct object of produžiće.

The verb produžiti takes something that gets extended:

• produžiti rok = to extend a deadline / term / period
• produžiti ugovor = to extend a contract

Since rok is a masculine noun that is inanimate, its accusative form is the same as the nominative:

• nominative: rok
• accusative: rok

So the form does not change.

Because pozajmice is in the genitive singular.

This is a very common Serbian structure:

• rok pozajmice = literally the period/term of the loan
• kraj knjige = the end of the book
• boja auta = the color of the car

So pozajmice tells you what kind of period it is: the loan period, borrowing period, lending period, depending on context.

Pod uslovom da means provided that, on condition that, or as long as.

It introduces a condition.

In your sentence:

• pod uslovom da je dostupnost potvrđena
• provided that availability has been confirmed

This is a fairly formal expression. In less formal Serbian, you might also see other conditional connectors such as:

• ako = if
• ukoliko = if / provided that

But pod uslovom da sounds especially like a formal stated condition.

Because da je potvrđena is not an infinitive structure. It is a full clause with a verb.

Here:

• je = is / has been
• potvrđena = confirmed

Together, je potvrđena means has been confirmed or is confirmed, depending on context.

So:

• pod uslovom da je dostupnost potvrđena
• provided that availability has been confirmed

This is a normal Serbian clause after da.

Because potvrđena agrees with dostupnost, which is a feminine singular noun.

In Serbian, the past passive participle agrees in gender and number with the noun it refers to.

Since:

• dostupnost is feminine singular

the participle must also be feminine singular:

• potvrđena

Compare:

• status je potvrđen — status is masculine
• dostupnost je potvrđena — dostupnost is feminine
• rešenje je potvrđeno — rešenje is neuter

Je is the 3rd person singular present of biti (to be), and here it helps form a passive/resultative meaning:

• dostupnost je potvrđena
• availability is confirmed / has been confirmed

This is a very common Serbian pattern:

• Dokument je potpisan = The document is signed / has been signed
• Rezervacija je potvrđena = The reservation is confirmed / has been confirmed

So je + passive participle is a key structure to recognize.

Dostupnost literally means availability.

In this sentence, it most likely means that something is available and that this availability has been officially checked or confirmed.

For example, in a library or lending context, it could refer to whether an item is available for extension.

So although the exact real-world meaning depends on context, grammatically it is simply the noun availability.

Yes, this word order is natural, especially in formal or administrative language.

The sentence flows like this:

• Produžiće rok pozajmice = main action
• pod uslovom da... = condition

You could rearrange parts for emphasis, for example:

• Pod uslovom da je dostupnost potvrđena, produžiće rok pozajmice.

That means the same thing, but it puts the condition first.

Serbian word order is generally more flexible than English, but the version you were given sounds perfectly normal.

Not exactly, though they can be close in meaning.

• pozajmica usually refers to a loan or something borrowed/lent
• pozajmljivanje is the verbal noun meaning borrowing or the act/process of borrowing

So:

• rok pozajmice = loan period
• period pozajmljivanja = borrowing period

Depending on the context, both might be possible, but rok pozajmice sounds like a fixed term connected with a loan/borrowing arrangement.

Yes, it sounds fairly formal and administrative.

The clues are expressions like:

• pod uslovom da
• dostupnost potvrđena
• rok pozajmice

This sounds like something you might read in:

• a library notice
• terms and conditions
• a system message
• official instructions

In casual speech, someone might say the same idea more simply, but this sentence is very natural in formal written Serbian.