Pod pretpostavkom da je izvadak valjan, pripremite prijepis.

Pod pretpostavkom da means on the assumption that or assuming that. It is a fairly formal expression, often used in administrative, legal, academic, or technical language.

In this sentence, it introduces a condition:

• Pod pretpostavkom da je izvadak valjan = assuming that the extract is valid

Compared with a simple ako (if), pod pretpostavkom da sounds more formal and more like a stated premise.

Because the preposition pod here requires the instrumental case.

The base noun is:

• pretpostavka = assumption

In the instrumental singular, it becomes:

• pretpostavkom

So:

• pod pretpostavkom = under the assumption

This is a fixed and common expression. A learner does not need to invent it from scratch every time; it is worth learning as a set phrase.

Here, da introduces a subordinate clause, and je is the 3rd person singular present tense of biti (to be).

So:

• da je izvadak valjan = that the extract is valid

This is not the same as English that in every situation, but here it introduces the content of the assumption.

About je:

• je = is
• It is the short, normal unstressed form of biti
• Croatian usually uses this short form in ordinary sentences

So the clause is simply:

• izvadak je valjan = the extract is valid

Izvadak is in the nominative singular because it is the subject of the clause:

• izvadak je valjan = the extract is valid

Here:

• izvadak = subject
• je = verb
• valjan = predicate adjective

Since it is the thing being described as valid, nominative is the expected case.

Valjan usually means valid, legally acceptable, proper, or in force, depending on context.

In this sentence, valjan most naturally means something like:

• valid
• officially acceptable
• legitimate

It is a fairly formal word and is very common in bureaucratic or legal contexts, for example with documents, identification, permits, claims, and similar things.

Pripremite is the imperative form of the verb pripremiti (to prepare).

It can mean:

• a command to more than one person: prepare
• a formal/polite command to one person: prepare

So Croatian pripremite can correspond to either:

• plural you prepare
• formal singular you prepare

This is very common in Croatian and other South Slavic languages: the same form is used for plural and polite address.

Also, pripremiti is a perfective verb, so it suggests completing the action: prepare it fully, get it ready.

Prijepis is the direct object of pripremite, so it is in the accusative singular.

However, prijepis is a masculine inanimate noun, and for many masculine inanimate nouns, the accusative singular is identical to the nominative singular.

So:

• nominative: prijepis
• accusative: prijepis

That is why the form does not change.

These two nouns are similar in that both can refer to text or documents, but they are not the same thing.

• izvadak usually means an extract, excerpt, or an official extract from a record/register
• prijepis usually means a transcript, copy, or written reproduction

So the sentence is talking about one document or source being valid (izvadak) and then instructing someone to prepare another text/document (prijepis).

This distinction is especially important in formal or administrative language.

Yes, very formal.

Several things make it sound formal:

• pod pretpostavkom da instead of simple ako
• valjan as a formal adjective
• nouns like izvadak and prijepis
• the imperative pripremite, which sounds like an instruction in an official document or procedure

A native speaker would likely associate this sentence with bureaucracy, administration, legal procedure, or professional documentation rather than everyday conversation.

Yes, it could, but the tone would change.

For example:

• Ako je izvadak valjan, pripremite prijepis.

This means roughly the same thing: If the extract is valid, prepare the transcript/copy.

However:

• ako is more neutral and everyday
• pod pretpostavkom da is more formal and abstract

So the original version sounds more official and procedural.

The comma separates the introductory subordinate clause from the main clause.

Structure:

• Pod pretpostavkom da je izvadak valjan = conditional/introduction
• pripremite prijepis = main instruction

Croatian commonly uses a comma before or after subordinate clauses in this kind of structure, especially when the subordinate clause comes first.

So the comma helps show:

1. the condition or assumption
2. the main action to be taken

Not completely, but the given order is natural and standard for formal writing.

The sentence is organized like this:

1. condition/assumption first
2. instruction second

That is a very normal structure:

• Pod pretpostavkom da je izvadak valjan, pripremite prijepis.

Croatian word order is relatively flexible, but changing it may affect emphasis or make the sentence sound less natural in formal style. The original order is probably the best choice for clear official language.

Pripremiti is a perfective verb.

That matters because perfective verbs in Croatian usually refer to a completed whole action. In an imperative, this often means:

• do the action
• bring it to completion
• get the result done

So pripremite prijepis means something like:

• prepare the transcript/copy
• have the transcript/copy ready
• produce the transcript/copy

The imperfective partner would be pripremati, but that would not be the normal choice here for a simple instruction to complete a task.

Without more context, it could be either:

• one person formally
• several people

That is because pripremite serves both functions.

Croatian distinguishes:

• pripremi = command to one person informally
• pripremite = command to several people or to one person formally/politely

So the sentence leaves that ambiguous unless the surrounding context makes it clear.