Prijavite poderotinu, osim ako je već obeležena.

Yes. Prijavite is the imperative form of prijaviti (to report).

In this sentence, it means Report ...

A useful thing to know is that prijavite can be:

• 2nd person plural imperative — talking to more than one person
• polite singular imperative — talking respectfully to one person

So it can mean either:

• You all, report ...
• Please report ... to one person in a formal/polite way

The less formal singular command would be Prijavi.

Because it is the direct object of Prijavite, so it goes into the accusative case.

The dictionary form is:

• poderotina = a tear / rip

In the accusative singular, it becomes:

• poderotinu

This happens because poderotina is a feminine noun ending in -a:

• nominative: poderotina
• accusative: poderotinu

So:

• Prijavite poderotinu = Report the tear/rip

Poderotina means a tear, rip, or torn spot, usually in a material or surface.

It comes from the idea of something being torn. In practical instructions like this, it often refers to visible damage that should be reported.

Depending on context, English might translate it as:

• tear
• rip
• torn area

Osim ako means unless.

Literally, it is built from:

• osim = except
• ako = if

So the structure is basically:

• except if

That is why Serbian often uses osim ako where English uses the single word unless.

So:

• osim ako je već obeležena = unless it is already marked

Je is the 3rd person singular form of biti (to be): is.

So:

• je obeležena = is marked

Here, obeležena is a form that agrees with the noun, and je functions like is in English.

So the clause means:

• unless it is already marked

The it is not stated separately, because Serbian often leaves it understood from context. Here it refers back to poderotina.

Because it agrees with the implied noun poderotina, which is feminine singular.

Obeležen changes to match gender and number:

• masculine singular: obeležen
• feminine singular: obeležena
• neuter singular: obeleženo
• plural: obeleženi / obeležene / obeležena, depending on gender/type

Since poderotina is feminine, Serbian uses:

• obeležena

Even though the noun is not repeated in the second clause, it is still understood:

• osim ako je već obeležena
• literally: unless [the tear] is already marked

It is doing the job of a predicate complement with je, similar to is marked in English.

In practice, learners often understand je obeležena as:

• a passive/result-state expression
• literally is marked

So although obeležena looks adjective-like and agrees in gender/number, the whole phrase je obeležena works like a verbal idea: is marked.

This is very common in Serbian.

Već means already.

So:

• već obeležena = already marked

It shows that the marking has been done before the action being requested.

Compare:

• je obeležena = is marked
• je već obeležena = is already marked

Because Serbian often omits subject pronouns when the meaning is clear from context.

In English, you must say:

• unless it is already marked

In Serbian, the referent is understood from the previous noun:

• osim ako je već obeležena

The listener naturally understands that je već obeležena refers to poderotina.

This is very normal in Serbian.

Serbian word order is fairly flexible, but this order is very natural.

The basic idea is:

• ako = if
• je = clitic form of is
• već = already
• obeležena = marked

So:

• ako je već obeležena = if it is already marked

A key point is that je is a clitic, and clitics in Serbian usually appear near the second position in their clause. That helps explain why je comes so early.

The sentence sounds natural as written.

In form, prijavite can match more than one pattern, but in this sentence it is understood as an imperative command.

That is because of the context and punctuation:

• Prijavite poderotinu, ... clearly sounds like an instruction

Without context, forms like this can sometimes look ambiguous to learners, but here the meaning is straightforward: Report the tear/rip ...

Because osim ako je već obeležena is a subordinate clause attached to the main instruction.

The main clause is:

• Prijavite poderotinu

The subordinate clause is:

• osim ako je već obeležena

In Serbian, clauses like this are commonly separated by a comma, especially in instructions and formal writing.

Often, yes, depending on context.

Both can relate to something being marked, but they can feel slightly different depending on usage:

• obeležiti / obeležena often suggests marking something clearly, identifying it, or placing a visible mark
• označiti / označena can also mean mark, label, or indicate

In many practical situations, the two may be close in meaning. The choice depends on the exact style and context, but obeležena is perfectly natural here.