Molim vas, ispunite obrazac prijave.

Molim vas is a polite way to introduce or soften a request. In this sentence, it works like please.

Literally, molim means I ask / I beg, and vas means you in the polite or plural form. So word-for-word it is closer to I ask you, but in normal usage it often simply means please.

So in this sentence, it is not the main action. The actual command is ispunite obrazac prijave.

Ispunite is the imperative form, meaning it is used to give a command or instruction.

It comes from the verb ispuniti = to fill in / complete.

Here, ispunite is the 2nd person plural imperative. In Croatian, that same form is also used for:

• speaking to more than one person
• speaking to one person formally/politely

So Ispunite obrazac prijave means Fill in the application form, said politely or to several people.

Croatian, like many European languages, uses the plural form for polite address.

That is why:

• ti = informal you singular
• vi / vas = plural you, but also formal you for one person

So in a formal situation, Croatian says:

• Molim vas, ispunite...

But to one friend or someone you speak to informally, you would say:

• Molim te, ispuni obrazac prijave.

So the plural form here does not necessarily mean several people; it can mean one person addressed politely.

Obrazac is in the accusative singular, because it is the direct object of the verb ispunite.

You are filling in what?
→ obrazac prijave

For many masculine inanimate nouns in Croatian, the accusative singular has the same form as the nominative singular. So:

• nominative: obrazac = form
• accusative: obrazac = form

That is why it looks unchanged.

Here, prijave is in the genitive singular.

The phrase obrazac prijave literally means something like:

• form of application
• or more naturally in English, application form

This is a very common Croatian structure: noun + genitive noun, where the second noun specifies the first one.

So:

• obrazac = form
• prijave = of application

If it were prijavu, that would be accusative singular, which would not fit this structure.

Yes. Both are possible, and both can mean application form.

Common options include:

• obrazac prijave
• prijavni obrazac
• sometimes obrazac za prijavu

They are very similar in meaning. In official or administrative language, obrazac prijave is very natural and common.

So the sentence could also appear as:

• Molim vas, ispunite prijavni obrazac.

This is about aspect, which is very important in Croatian verbs.

• ispuniti = perfective
• ispunjavati = imperfective

The perfective verb ispuniti is used because the speaker wants one completed result: the form should be filled in.

In instructions, requests, and one-time commands, Croatian often prefers the perfective imperative:

• Ispunite obrazac. = Fill in the form completely.

The imperfective would suggest more of an ongoing or repeated action, which is not the normal choice here.

Yes, Croatian word order is fairly flexible, although some versions sound more natural than others.

The given sentence:

• Molim vas, ispunite obrazac prijave.

is very natural and standard.

You could also hear:

• Ispunite obrazac prijave, molim vas.
• Obrazac prijave ispunite, molim vas. — possible, but more marked or context-dependent

Putting Molim vas at the beginning is especially common in polite instructions.

In normal Croatian writing, vas is usually written with a lowercase letter, even when it is polite singular.

So:

• Molim vas is standard.

Sometimes people write Vas with a capital letter in:

• formal letters
• emails
• especially polite or ceremonial writing

But that is a stylistic choice, not a grammar rule you must always follow.

The informal singular version is:

• Molim te, ispuni obrazac prijave.

Changes:

• vas → te
• ispunite → ispuni

So:

• Molim vas, ispunite... = polite/formal or plural
• Molim te, ispuni... = informal singular