Procjena štete počinje sutra.

Because štete is the genitive singular form of šteta (damage).

In Croatian, a noun like procjena (assessment, evaluation) is commonly followed by the genitive to mean assessment of ... So:

• procjena = assessment
• šteta = damage
• procjena štete = assessment of damage

A useful way to think about it is:

• procjena čega? = assessment of what?
• štete = of damage

So šteta changes to štete because of the grammar of the phrase.

The subject is the whole noun phrase procjena štete.

However, the head noun is procjena, not štete. That matters because the verb agrees with procjena.

So the structure is:

• procjena = the main noun, assessment
• štete = dependent noun in the genitive, of damage

That is why the sentence behaves as if the subject were singular: the main noun is singular.

Because it agrees with procjena, which is singular.

počinje is 3rd person singular present: (it) begins / starts.

Even though there are two nouns in the sentence, only procjena controls the verb. štete is not a second subject; it just tells you what is being assessed.

So:

• procjena = singular
• therefore počinje = singular

Because Croatian, like English, often uses the present tense for a planned, scheduled, or expected future event.

Compare English:

• The meeting starts tomorrow.

That is present in form, but future in meaning.

Croatian works similarly:

• Procjena štete počinje sutra.

So the sentence is grammatically present, but sutra makes the time reference future.

Yes. A very natural alternative is:

• Procjena štete počet će sutra.

That also means The damage assessment will begin tomorrow.

The version with počinje sutra sounds very natural and is common for scheduled events. The version with počet će sutra is simply more explicitly future.

A useful spelling note: in standard writing, it is počet će, not početi će, when that verb form comes before će.

Sutra is an adverb of time meaning tomorrow.

It does not change for case, gender, or number. It just adds time information to the sentence.

So you can think of it as a fixed word, similar to English tomorrow.

Because Croatian has no articles.

There is no direct equivalent of English a / an / the used in ordinary sentences. Whether something is definite or indefinite is usually understood from context.

So Procjena štete počinje sutra can correspond to English:

• The damage assessment begins tomorrow
• or sometimes A damage assessment begins tomorrow

In most real contexts, English would probably use the, but Croatian does not need to say it.

Yes. Croatian word order is more flexible than English because case endings show the relationships between words.

The given sentence is a neutral, natural order:

• Procjena štete počinje sutra.

You could also say:

• Sutra počinje procjena štete.

That puts more focus on tomorrow.

So the order can move, but the emphasis may change slightly.

A rough pronunciation guide:

• procjena ≈ PRO-tsye-na
• štete ≈ SHTE-te
• počinje ≈ PO-chi-nye
• sutra ≈ SOO-tra

A few useful sound rules here:

• c = ts
• č = ch as in church
• j = y as in yes
• nj = a ny sound, similar to the middle of canyon

So počinje has that ny-like sound near the end: po-chi-nye.