Odmah ću prijaviti gubitak kartice.

The future is formed with ću + the infinitive:

• ću = I will
• prijaviti = to report

So ću prijaviti means I will report.

More specifically, ću is the short form of the verb hteti (to want), which is used to build the future tense in Serbian.

Because ću is a clitic: a short unstressed word that normally goes in second position in the clause.

In this sentence:

• Odmah = first element
• ću = second-position clitic

So the order is very natural:

• Odmah ću prijaviti... = I’ll report ... immediately / right away

This second-position behavior is very common in Serbian with short forms like ću, sam, je, ga, mi, etc.

Serbian often omits subject pronouns when they are already clear from the verb form.

Here, ću already shows first person singular, so ja is not necessary.

Compare:

• Odmah ću prijaviti gubitak kartice. = neutral, natural
• Ja ću odmah prijaviti gubitak kartice. = also correct, but ja adds emphasis, like I will report it right away

This is normal in Serbian and other South Slavic languages.

Yes, that is also correct.

A very common alternative is:

• Prijaviću gubitak kartice odmah.

This uses the attached future form prijaviću instead of ću prijaviti.

Both mean the same thing. The main difference is style and word order:

• Odmah ću prijaviti... puts focus early on immediately
• Prijaviću... odmah sounds a bit more like I’ll report it right away

Both are natural Serbian.

Because prijaviti is perfective.

In Serbian, aspect matters a lot:

• prijaviti = to report, as a single completed action
• prijavljivati = to be reporting / to report repeatedly / habitually

In this sentence, the speaker means one concrete action: they will make the report. That is why prijaviti is the natural choice.

Gubitak is the direct object of prijaviti.

The phrase means literally something like:

• report the loss of the card

So:

• prijaviti = to report
• gubitak = loss

Grammatically, gubitak is in the accusative singular. For this masculine inanimate noun, the accusative looks the same as the nominative:

• nominative: gubitak
• accusative: gubitak

That is why the form does not change.

Because kartice is genitive singular of kartica.

The noun gubitak often takes another noun in the genitive to show loss of something:

• gubitak kartice = loss of the card
• gubitak pasoša = loss of the passport
• gubitak novca = loss of money

So:

• kartica = nominative singular
• kartice = genitive singular

This is a very common Serbian pattern: noun + genitive.

Odmah means immediately, right away, or at once.

It is often placed early in the sentence, especially when the speaker wants to emphasize urgency:

• Odmah ću prijaviti gubitak kartice.

But it can move:

• Gubitak kartice ću prijaviti odmah.
• Prijaviću gubitak kartice odmah.

These are all possible, though the original version sounds very natural and clear.

Usually kartica means a small card, very often:

• a bank card
• an ID card
• a membership card
• a SIM card, depending on context

So in a sentence like this, many learners will naturally understand kartica as something like a bank card or similar personal card.

It is not the same as karta, which more often means:

• ticket
• map
• playing card in some contexts

So kartica is the right word for a personal or payment-type card.

In Cyrillic, it is:

Одмах ћу пријавити губитак картице.

Serbian officially uses both Latin and Cyrillic, and this sentence is completely standard in either script.