Osiguranik ima policu osiguranja.

Osiguranik is in the nominative singular because it is the subject of the sentence — the person who has something.

Its dictionary form is also osiguranik, so nothing changes here.

A rough pattern is:

• osiguranik = nominative singular
• used for who is doing the action or being described

In this sentence, osiguranik is the one who ima something.

Ima is the 3rd person singular present tense of imati (to have).

So:

• ja imam = I have
• ti imaš = you have
• on/ona/ono ima = he/she/it has

Because osiguranik is singular, the verb is also singular:

• Osiguranik ima ... = The insured person has ...

Because policu is the accusative singular form of polica.

In Croatian, the direct object often changes form. Here, the thing being had is the direct object, so polica must go into the accusative:

• polica = nominative singular
• policu = accusative singular

This is very common with feminine nouns ending in -a:

• žena → ženu
• kuća → kuću
• polica → policu

So:

• Polica je skupa. = The policy is expensive.
• Ima policu. = He/she has a policy.

Osiguranja is the genitive singular of osiguranje (insurance).

Croatian often uses the pattern:

• noun + genitive noun

to express something like of ... in English.

So:

• polica osiguranja literally = policy of insurance
• natural English = insurance policy

This is a very common structure in Croatian. Similar examples:

• čaša vode = glass of water
• boja zida = color of the wall
• polica osiguranja = insurance policy

Yes, it is a normal and very common way to say insurance policy.

Even though it is built grammatically as policy of insurance, you should learn polica osiguranja as a standard phrase.

So in practice:

• polica osiguranja = insurance policy

Because Croatian does not have articles like English a/an/the.

So Osiguranik ima policu osiguranja could mean:

• The insured person has an insurance policy
• The insured person has the insurance policy
• An insured person has an insurance policy

Which one is meant depends on context.

Croatian usually leaves that kind of information to the situation, word order, or extra words if needed.

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

The neutral order here is:

• Osiguranik ima policu osiguranja.

But you could also hear:

• Policu osiguranja ima osiguranik.
• Osiguranja policu ima osiguranik. — grammatically possible, but much less natural in ordinary speech

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

The most natural default version is still:

• Osiguranik ima policu osiguranja.

Good question, because -a can look plural to English speakers.

Here, osiguranja is genitive singular of the neuter noun osiguranje.

The forms are:

• osiguranje = nominative singular
• osiguranja = genitive singular
• osiguranja can also be nominative/accusative plural in some contexts

So how do you know which it is here?

Because after polica in the phrase polica osiguranja, the normal meaning is policy of insurance, so osiguranja is understood as genitive singular.

They are related words, but they mean different things:

• osiguranik = the insured person / policyholder / insured party
• osiguranje = insurance

So:

• osiguranik = a person
• osiguranje = the insurance itself, an abstract thing/service

That is why the sentence combines them:

• the person (osiguranik) has
• a policy (policu)
• of insurance (osiguranja)

Grammatically, osiguranik is a masculine noun form.

In real usage, it is often used in a general legal/administrative sense for the insured person. Depending on context and style, Croatian may use the masculine form generically, especially in formal language.

If you specifically want a feminine form, you may sometimes encounter feminine wording in certain contexts, but administrative Croatian often keeps the masculine noun as a general label.

For a learner, the important thing is:

• in this sentence, osiguranik is grammatically masculine singular
• therefore the verb is ima

A simple pronunciation guide:

• Osiguranik ≈ o-see-goo-RAH-neek
• ima ≈ EE-ma
• policu ≈ PO-lee-tsoo
• osiguranja ≈ o-see-goo-RAHN-ya

A few useful sound notes:

• c = ts
• j = y
• g is always a hard g as in go
• Croatian vowels are usually clear and consistent

So policu osiguranja has:

• c in policu = ts
• j in osiguranja = y

Usually, the normal expression is polica osiguranja.

Croatian often prefers a noun + genitive structure where English may prefer a noun used like an adjective. So instead of trying to build something like insurance policy with an adjective, Croatian naturally says:

• polica osiguranja

That is the form you should memorize and use.

The noun policu is singular, so yes, grammatically it refers to one policy.

If you wanted plural, you would need a different form, for example:

• Osiguranik ima police osiguranja. = The insured person has insurance policies.

So the singular/plural distinction is shown by the noun form, even though Croatian does not use articles.