Ovo je policijska postaja.

Ovo means this.

In this sentence, ovo is used to point to or identify something: This is a police station.

A useful thing to know is that Croatian often uses ovo in identification sentences like:

• Ovo je kuća. — This is a house.
• Ovo je moja sestra. — This is my sister.

Even when the noun that follows has a gender, ovo often stays in this neuter form when you are introducing or identifying something.

That is a very common question.

• Ovo je policijska postaja. = This is a police station.
• Ova policijska postaja = this police station

So the difference is:

1. ovo je + noun
   Used to identify something.

2. ova + noun
   Used directly before a feminine noun to mean this ...

Because postaja is feminine, the phrase this police station would be:

• ova policijska postaja

But the full sentence This is a police station is naturally:

• Ovo je policijska postaja.

Je means is.

It is the 3rd person singular present form of the verb biti = to be.

So:

• ovo = this
• je = is
• policijska postaja = police station

Together: Ovo je policijska postaja. = This is a police station.

Literally:

• policijska = police / police-related
• postaja = station

So policijska postaja literally means police station.

The adjective policijska comes from policija = police.

Because it must agree with postaja, which is a feminine singular noun.

In Croatian, adjectives change their endings to match the noun in:

• gender
• number
• case

Here:

• postaja is feminine
• singular
• nominative

So the adjective also takes the feminine singular nominative form:

• policijski (masculine)
• policijska (feminine)
• policijsko (neuter)

That is why you get:

• policijska postaja

Postaja is feminine.

A helpful clue is that many Croatian nouns ending in -a are feminine.

Because postaja is feminine, words that describe it also take feminine forms, such as:

• ova postaja = this station
• policijska postaja = police station
• nova postaja = new station

It is in the nominative singular.

In a sentence like Ovo je policijska postaja, the noun after je is in the nominative because it names or identifies what something is.

So:

• postaja = nominative singular
• policijska also matches it in nominative singular feminine

No. Croatian does not have articles like English a and the.

So policijska postaja can mean:

• a police station
• the police station

The exact meaning depends on context.

That means Ovo je policijska postaja. could be understood as:

• This is a police station.
• This is the police station.

In many learning contexts, This is a police station is the most natural translation.

The neutral, standard order here is:

• Ovo je policijska postaja.

Croatian word order is more flexible than English, but changing it usually changes emphasis.

For example, this sentence is the most natural way to simply identify something. Other orders may sound marked, poetic, or context-dependent.

So as a learner, it is best to use:

• Ovo je policijska postaja.

A rough English-friendly guide is:

OH-vo yeh po-lee-TSEE-y-ska PO-sta-ya

A few helpful notes:

• j is pronounced like English y
• c is pronounced like ts
• ij in policijska is part of the adjective form and may feel a little tricky at first
• j in postaja is also like y

So:

• je sounds like yeh
• policijska has the ts sound in the middle
• postaja ends roughly like -taya

Yes, in many situations you can.

• Ovo je ... = This is ...
• To je ... = That is ... / It is ...

In everyday speech, to je is extremely common when identifying something. But if you are specifically saying this, then ovo je is the clearest match.

So both can appear, but they are not exactly the same:

• Ovo je policijska postaja. = This is a police station.
• To je policijska postaja. = That is a police station. / It is a police station.

You would say:

Ovo nije policijska postaja.

Here, nije means is not.

So:

• Ovo je policijska postaja. = This is a police station.
• Ovo nije policijska postaja. = This is not a police station.

You can say:

Je li ovo policijska postaja? = Is this a police station?

This is a very common Croatian way to form a yes/no question:

• Je li ... ?

So:

• Ovo je policijska postaja. = This is a police station.
• Je li ovo policijska postaja? = Is this a police station?

No, Croatian also has stanica, which often also means station or stop, depending on context.

However, policijska postaja is the standard expression for police station in Croatian.

So for this sentence, postaja is exactly the right word to learn.