Služba za ljudske resurse je proverila obavezno socijalno osiguranje.

Yes, služba can mean service, but in administrative and workplace contexts it can also mean office, department, or unit.

So služba za ljudske resurse is a normal way to say the Human Resources department.

Depending on context, služba can sound more institutional or bureaucratic than a simple English department.

The preposition za usually takes the accusative case when it means for.

The base form is:

• ljudski resursi = human resources (nominative plural)

After za, it becomes:

• za ljudske resurse = for human resources (accusative plural)

Both words change to match the required case:

• ljudski → ljudske
• resursi → resurse

Je is the 3rd person singular present form of biti (to be), and here it is used as an auxiliary verb to form the past tense.

So:

• je proverila = has checked / checked

This is the normal Serbian perfect tense structure:

• auxiliary + past participle

In this sentence:

• je = auxiliary
• proverila = past participle

Because the verb form agrees with the grammatical subject, and the subject is služba, which is feminine singular.

So the past participle must also be feminine singular:

• služba je proverila

Compare:

• direktor je proverio = the director checked
• komisija je proverila = the commission checked
• odeljenje je proverilo = the department checked

Even though a department contains multiple people, Serbian agreement follows the grammatical noun, not the real number of people involved.

It is the perfect tense in Serbian, used very often for past actions.

The verb proveriti is perfective, so je proverila usually means the action was completed.

So this sentence suggests that the HR department finished checking the mandatory social insurance.

If you wanted an ongoing or repeated action, Serbian would normally use an imperfective verb instead, such as proveravati.

Because all three words belong to the same noun phrase, and the adjectives must agree with the noun.

The main noun is:

• osiguranje = insurance

It is:

• neuter
• singular

So the adjectives must also be neuter singular:

• obavezno
• socijalno
• osiguranje

That is why all three have -o / -e-type neuter singular endings.

It actually is the direct object, so it is in the accusative case.

However, for many neuter singular nouns in Serbian, the nominative and accusative forms are identical.

So:

• nominative: osiguranje
• accusative: osiguranje

The case is different in function, but not in visible form.

Because Serbian does not have articles like the or a/an.

Definiteness is usually understood from:

• context
• word order
• shared knowledge
• the situation being discussed

So Služba za ljudske resurse can mean the Human Resources department, and no separate word for the is needed.

Yes, Serbian word order is more flexible than English word order.

The sentence as given is a neutral, natural version:

• Služba za ljudske resurse je proverila obavezno socijalno osiguranje.

You could also move things for emphasis, for example:

• Obavezno socijalno osiguranje je proverila služba za ljudske resurse.

That version puts more emphasis on what was checked.

One important detail: je is a clitic, so it normally appears in second position, not just anywhere in the sentence.

Yes, ljudski resursi is a standard and very common term, especially in business and formal workplace language.

So služba za ljudske resurse is a perfectly normal expression.

You may also hear terms like:

• kadrovska služba = personnel office / staffing office

That can be similar, but it may sound a bit more traditional or narrower than modern HR language.

Because the subject is not the people in HR. The subject is the singular noun služba.

In Serbian, verb agreement follows the grammatical subject:

• služba = singular feminine
• therefore je proverila = singular feminine

If the subject were plural, the verb would be plural too. For example:

• zaposleni u ljudskim resursima su proverili... = the employees in HR checked...

So the sentence is grammatically about the department as an institution, not about individual employees.