Ulazna vrata su zatvorena.

Because vrata is a plural-only noun in Croatian when it means door. This is very common and important to learn early.

So even when English uses singular door, Croatian usually says vrata and treats it grammatically as plural:

• Vrata su otvorena. = The door is open.
• Vrata su zatvorena. = The door is closed.

This is why the verb is also plural: su, not je.

Do not confuse this with vrat, which is a completely different word meaning neck.

Because the subject ulazna vrata is grammatically plural.

• su = are
• je = is

Since vrata behaves as a plural noun, Croatian says:

• Ulazna vrata su zatvorena.

not:

• Ulazna vrata je zatvorena. ✘

Even though English translates it as The entrance door is closed, Croatian grammar still treats vrata as plural.

Ulazna means entrance, entry, or front in this context.

It comes from ulaz, meaning entrance or entry.

So:

• ulazna vrata = entrance door, front door, or entry door

Which English translation sounds best depends on context. In everyday English, front door is often the most natural translation, but grammatically ulazna vrata is literally entrance door(s).

Because it has to agree with vrata in gender, number, and case.

Here, vrata is:

• neuter
• plural
• nominative (because it is the subject)

So the adjective must match that:

• ulazna vrata

The same thing happens with zatvorena, which also agrees with vrata.

A useful thing to notice: the form ulazna can look confusing because it is also used in some other combinations, but here it is specifically the neuter plural nominative form agreeing with vrata.

It is in the nominative case, because it is the subject of the sentence.

The basic structure is:

• Ulazna vrata = subject
• su = verb
• zatvorena = predicate adjective / participle-like form describing the subject

So the sentence is essentially:

• The entrance door is closed.

Since the subject is nominative, the adjective ulazna also appears in nominative plural neuter.

It is best understood as a past passive participle that is often used like an adjective.

In this sentence:

• su zatvorena = are closed

So zatvorena describes the current state of the door. In practice, learners can often think of it as an adjective meaning closed, even though historically and grammatically it is connected to the verb zatvoriti / zatvarati (to close).

This pattern is very common in Croatian:

• Vrata su otvorena. = The door is open.
• Prozor je zatvoren. = The window is closed.
• Trgovina je otvorena. = The shop is open.

It means closed, not necessarily locked.

So:

• Vrata su zatvorena. = The door is closed.

If you want to say locked, Croatian usually uses:

• Vrata su zaključana. = The door is locked.

This is an important difference:

• zatvoren/o/a = shut, closed
• zaključan/o/a = locked

A door can be zatvorena without being zaključana.

Because Croatian does not have articles like English a and the.

So Croatian simply says:

• Ulazna vrata su zatvorena.

and context tells you whether English should be:

• The entrance door is closed
• An entrance door is closed
• Entrance doors are closed

In this sentence, the natural English translation is usually The entrance door is closed, but Croatian does not need a separate word for the.

Yes, absolutely.

• Vrata su zatvorena. = The door is closed.

Adding ulazna simply makes it more specific:

• Ulazna vrata su zatvorena. = The entrance/front door is closed.

So the shorter sentence is very common, especially if it is already clear which door is being talked about.

Yes. Croatian word order is more flexible than English, although some versions sound more natural than others depending on emphasis.

The neutral order here is:

• Ulazna vrata su zatvorena.

You may also hear:

• Vrata su zatvorena.
• Zatvorena su ulazna vrata.

Changing the order usually changes the focus or emphasis, not the basic meaning.

For example:

• Zatvorena su ulazna vrata. can sound like It is the entrance door that is closed or place more attention on the closed state.

For learners, the safest default is the original neutral order:

• Ulazna vrata su zatvorena.

A rough pronunciation guide for an English speaker is:

• oo-LAHZ-nah VRAH-tah soo zaht-voh-REH-nah

A few helpful notes:

• u is like oo in food
• a is like a in father
• r is rolled or tapped
• z is like English z
• v is a normal v
• stress can vary by dialect and is not always marked in everyday writing, so learners usually focus first on clear vowels and consonants

Croatian pronunciation is generally much more phonetic than English, so once you know the sounds, reading gets easier.

Not necessarily. Grammatically it is plural, but it can refer to what English thinks of as a single door.

That is because vrata is a plural-only noun. So Croatian grammar treats it as plural even when the real-world object is one doorway or one door unit.

In some contexts, it may genuinely refer to double doors, but very often it is simply the normal word for door.

So you should separate:

• grammar: plural
• translation into English: often singular

The sentence has a simple pattern:

• Ulazna vrata = subject
• su = present tense of biti (to be), 3rd person plural
• zatvorena = closed

So literally, word by word, you can think of it as:

• entrance door(s) are closed

Natural English:

• The entrance door is closed.

This is a very useful sentence pattern in Croatian:

• X je/su + adjective/participle

For example:

• Prozor je otvoren. = The window is open.
• Vrata su zaključana. = The door is locked.
• Trgovine su zatvorene. = The shops are closed.