Zračni prijevoznik čuva tajnu.

• zračni = air, aerial
• prijevoznik = carrier, transport operator
• zračni prijevoznik together = air carrier / airline
• čuva = keeps, guards, preserves
• tajnu = secret (here in the accusative singular)

So grammatically:

• zračni prijevoznik is the subject
• čuva is the verb
• tajnu is the direct object

Because Croatian often uses an adjective + noun structure where English might use a compound noun.

• zračni is an adjective meaning air-related
• prijevoznik is a noun meaning carrier

So instead of one single word like English sometimes prefers, Croatian says literally air carrier as two words.

Because tajnu is in the accusative case, which is used for the direct object of the verb.

The basic dictionary form is:

• tajna = secret (nominative singular)

But in this sentence, the secret is the thing being kept, so it becomes:

• tajnu = secret (accusative singular)

This is a very common pattern for feminine nouns ending in -a:

• nominative: tajna
• accusative: tajnu

Because zračni must agree with prijevoznik in:

• gender
• number
• case

Here, prijevoznik is:

• masculine
• singular
• nominative

So the adjective also takes the matching form:

• zračni prijevoznik

This is standard adjective agreement in Croatian.

čuva is the 3rd person singular present tense of the verb čuvati.

That means it matches a subject like:

• on = he
• ona = she
• ono = it
• or any singular noun, such as zračni prijevoznik

So:

• čuvam = I keep
• čuvaš = you keep
• čuva = he/she/it keeps

čuvati has a few related meanings depending on context, such as:

• to keep
• to guard
• to preserve
• to look after

In this sentence, with tajnu, it means to keep a secret.

So this is a natural verb choice:

• čuvati tajnu = to keep a secret

Yes. čuvati is an imperfective verb.

That usually suggests:

• an ongoing action
• a repeated action
• a general fact or state

So the sentence can sound like:

• the air carrier keeps the secret
• the air carrier is keeping the secret
• the air carrier guards the secret

If you wanted a more one-time, completed idea, Croatian might use a perfective partner in another context. But here čuva presents the action as ongoing or general.

Yes. Croatian word order is more flexible than English because case endings help show grammatical roles.

The neutral order here is:

• Zračni prijevoznik čuva tajnu.

But you could also hear:

• Tajnu čuva zračni prijevoznik.
• Čuva tajnu zračni prijevoznik.

These alternatives can shift emphasis or style, but the basic meaning stays the same.

Because Croatian has no articles.

English says:

• the secret
• a secret

Croatian usually just says:

• tajna / tajnu

Whether it means a secret or the secret depends on context.

So tajnu by itself can correspond to either a secret or the secret, depending on the situation.

Yes, but it sounds a bit formal or technical, like air carrier in English.

In everyday conversation, people might also use other expressions depending on context, but zračni prijevoznik is perfectly correct and standard, especially in official, legal, or transport-related language.

A rough pronunciation guide is:

• Zračni ≈ ZRAHCH-nee
• prijevoznik ≈ pree-yeh-VOHZ-neek
• čuva ≈ CHOO-vah
• tajnu ≈ TY-noo

A few useful sound notes:

• č sounds like ch in church
• j sounds like English y in yes
• ž sounds like the s in measure
• nj sounds like ny in canyon

Mostly from case forms.

• zračni prijevoznik is in the nominative, which marks the subject
• tajnu is in the accusative, which marks the direct object

So even if the word order changes, the endings help you see who is doing the action and what is affected by it.

That is one of the big advantages of Croatian case endings.