Izvođač radova radi danas.

Because radova is the genitive plural form of radovi.

In izvođač radova, Croatian is using a very common pattern:

• noun + genitive
• literally: performer/executor of works

So:

• radovi = works, jobs
• radova = of works

That is why izvođač radova means something like contractor or executor of works.

Yes, it is very often used as a set phrase, especially in construction, business, and official language.

Literally, it means:

• izvođač = performer, executor, contractor
• radova = of works

As a phrase, izvođač radova usually means:

• contractor
• building contractor
• the party carrying out the work

A useful detail: izvođač by itself can also mean performer (for example a musical performer), so radova makes the meaning more specific.

They come from related roots, but they are different words and different parts of speech.

• radova is a noun form from rad / radovi
• radi is a verb form from raditi

Here:

• radova = of works
• radi = works / is working

So in this sentence:

• izvođač radova = contractor
• radi danas = works today / is working today

Even though they look similar, they are doing different jobs in the sentence.

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

So Izvođač radova radi danas. could mean:

• The contractor is working today.
• A contractor is working today.

Which one is intended depends on the context.

English requires an article, but Croatian usually leaves that information to context.

It can mean both, depending on context.

Croatian present tense often covers both:

• English simple present: works
• English present continuous: is working

Because of danas (today), this sentence is very naturally understood as:

• is working today

But in some contexts it could also be translated as:

• works today

So Croatian does not need a separate form like English is working here.

No, Croatian word order is fairly flexible.

This version is neutral and natural:

• Izvođač radova radi danas.

But you could also say:

• Danas izvođač radova radi.
• Izvođač radova danas radi.

These all mean roughly the same thing, but the emphasis changes:

• Danas... puts more focus on today
• Izvođač radova... starts with the subject more neutrally

So the sentence order can move around more than in English.

Danas is an adverb, meaning today.

It is not a noun here, and you do not need to think of it as a case form in this sentence. It simply tells you when the action happens:

• radi danas = works today / is working today

So it functions like English today.

A rough learner-friendly guide would be:

• iz-VOH-jach

A few sound notes:

• đ is a soft sound, somewhat like the j sound in some pronunciations of duke or a softened dy/j sound
• č is like ch in church, but a bit firmer
• the r in Croatian is usually tapped or rolled, not the English r

So izvođač will not sound exactly like an English word, but that approximation can help you get started.

Yes, it can.

For example:

• Izvođač radi danas.

That is grammatical. But the meaning is less specific, because izvođač alone can mean things like:

• performer
• contractor
• executor

Adding radova makes it clear that you mean a contractor carrying out works, especially in a construction or official context.

Yes, izvođač is grammatically masculine singular.

In real usage, especially in official or professional language, masculine job titles are often used in a general way. Depending on context and style, you may also encounter feminine forms, but izvođač radova is the standard phrase you are very likely to see.

So for a learner, the main thing to know is:

• this sentence is grammatically masculine singular
• it agrees with radi, which is 3rd person singular present

Here, izvođač is in the nominative singular, because it is the subject of the sentence.

So the structure is:

• Izvođač = subject, nominative singular
• radova = genitive plural, dependent on izvođač
• radi = verb
• danas = adverb

That gives you:

• [The/A] contractor
  • works / is working
    • today