Ne mogu se prijaviti bez korisničkog imena, pa ću dokument skenirati kasnije.

Croatian often leaves out subject pronouns when the verb already shows who the subject is.

• mogu = I can
• ću = I will

So ja is not necessary unless you want extra emphasis or contrast:

• Ja ne mogu se prijaviti... = I can’t log in... (emphatic)

The normal, natural version is simply Ne mogu...

In Croatian, ne is usually written separately from the verb:

• ne mogu = I cannot
• ne znam = I don’t know
• ne radim = I am not working

So ne mogu is the standard spelling. A learner may notice a few common exceptions in Croatian, but with mogu, it is definitely two words.

Here prijaviti se means to log in / to sign in.

The basic verb prijaviti can mean things like:

• to report
• to register
• to announce

But with se, it often means that the subject is registering or logging in themselves:

• prijaviti se na tečaj = to sign up for a course
• prijaviti se u sustav = to log into the system

So in this sentence, Ne mogu se prijaviti means I can’t log in.

Se is a reflexive clitic. In many Croatian verbs, it is simply part of the standard verb expression and does not always translate directly into English.

So you should learn prijaviti se as a unit.

Compare:

• prijaviti nekoga/nešto = to report someone/something
• prijaviti se = to register / log in / sign up

Even though English does not use myself here, Croatian uses se as part of the verb.

Because se is a clitic, and Croatian clitics tend to appear early in the clause.

With a modal verb like mogu plus an infinitive, the usual order is:

• mogu se prijaviti

not normally:

• mogu prijaviti se

So the pattern is:

• finite verb (mogu) + clitic (se) + infinitive (prijaviti)

This is the most natural word order.

Because the preposition bez always takes the genitive case.

The base form is:

• korisničko ime = username

After bez, it changes to genitive:

• bez korisničkog imena = without a username / without the username

Both words change because this is an adjective + noun phrase:

• korisničko → korisničkog
• ime → imena

Korisničko ime is the normal Croatian term for username.

It is made up of:

• korisnik = user
• korisnički = user-, relating to a user
• ime = name

So literally it is user name, just like in English.

It is in the accusative singular because it is the direct object of skenirati:

• skenirati što? → dokument

But dokument is a masculine inanimate noun, and for many masculine inanimate nouns, the accusative singular looks the same as the nominative singular.

So:

• nominative: dokument
• accusative: dokument

That is why the form does not visibly change.

Croatian future tense is often formed with:

• a form of htjeti (ću, ćeš, će, ćemo, ćete, će)
• • the infinitive

So:

• ću skenirati = I will scan
• ćeš skenirati = you will scan
• će skenirati = he/she/it will scan

In this sentence:

• pa ću dokument skenirati kasnije = so I will scan the document later

Here ću is the 1st person singular future auxiliary.

Because ću is also a clitic, and Croatian clitics usually appear near the beginning of the clause.

So after pa (so / and so / then), it is natural to say:

• pa ću...

This is standard Croatian word order.

Here pa means something like:

• so
• and so
• then

It connects the two parts of the sentence:

• Ne mogu se prijaviti bez korisničkog imena = I can’t log in without a username
• pa ću dokument skenirati kasnije = so I’ll scan the document later

It is very common in everyday Croatian and often sounds natural and conversational.

Yes, Croatian word order is fairly flexible.

The original:

• pa ću dokument skenirati kasnije

You could also say:

• pa ću kasnije skenirati dokument
• dokument ću skenirati kasnije
• kasnije ću skenirati dokument

The meaning stays very similar, but the emphasis shifts slightly. The original sentence is perfectly natural.

Sometimes yes, especially in informal or tech-related speech, because logirati se is used by many speakers for to log in.

However, prijaviti se is more standard and widely accepted. It is a very useful verb because it can mean:

• to log in
• to sign in
• to register
• to sign up

So for learners, prijaviti se is usually the safer choice.

Croatian does not have articles like English a/an or the.

So:

• dokument can mean a document or the document
• korisničko ime can mean a username or the username

Context tells you which meaning is intended. In this sentence, English naturally uses a username and the document, but Croatian does not need separate article words for that.