Procjena štete ne počinje, osim ako procjenitelj štete dođe.

Because Croatian uses the genitive case very often to express of.

So:

• procjena štete = assessment of damage
• procjenitelj štete = assessor of damage

The base noun is šteta (damage), but after nouns like procjena and procjenitelj, it becomes štete because it is in the genitive singular.

Here it is singular.

The form štete can be confusing because it can also be a plural form in other contexts, but in this sentence it is genitive singular of šteta.

You can tell from the structure:

• procjena štete = assessment of damage
• not assessment of damages as a plural count noun

So although štete looks like it could be plural, here it means of damage.

The subject is procjena štete.

More precisely, the head noun is procjena, and that is why the verb is počinje (3rd person singular).

So the structure is:

• procjena = subject head
• štete = genitive modifier
• ne počinje = does not begin

A learner might look at štete and wonder whether it affects the verb, but it does not. The verb agrees with procjena, not with štete.

In Croatian, the negative particle ne is usually written separately from the verb.

So:

• počinje = begins / is beginning
• ne počinje = does not begin / does not start

This is the normal pattern with most verbs. English speakers sometimes expect something more like a single negative verb form, but Croatian usually uses ne + verb.

Osim ako means unless.

Literally, it is something like except if, but in natural English the best equivalent is unless.

So this pattern:

• X ne..., osim ako Y...

means:

• X does not..., unless Y...

It is a very common way to express an exception to a negative statement.

Because osim ako procjenitelj štete dođe is a subordinate clause.

In Croatian, subordinate clauses are normally separated by a comma, especially with conjunctions such as:

• ako = if
• kad = when
• dok = while
• osim ako = unless

So the comma is standard punctuation here.

Because dođe comes from the perfective verb doći, while dolazi comes from the imperfective verb dolaziti.

The difference is about aspect:

• dođe focuses on the arrival as a completed event
• dolazi focuses more on an ongoing, repeated, or habitual coming

In this sentence, the condition is that the assessor arrives. That is a single completed event, so dođe is the natural choice.

Compare:

• ako dođe = if he/she comes / if he/she arrives
• ako dolazi would sound more like if he/she is coming or if he/she usually comes, depending on context

This is very normal in Croatian.

After words like ako and osim ako, Croatian often uses the present tense, especially with a perfective verb, to talk about a future condition.

So:

• ako dođe literally looks like if he/she comes
• but in context it means if he/she comes later / if he/she does come

English also does something similar in clauses with if and unless:

• It won’t start unless he comes.

You do not normally say unless he will come in English, and Croatian works in a similar way here.

Yes. Croatian word order is fairly flexible.

The sentence given is a neutral, natural order:

• Procjena štete ne počinje, osim ako procjenitelj štete dođe.

But you could also put the subordinate clause first:

• Osim ako procjenitelj štete dođe, procjena štete ne počinje.

That still means the same thing. The difference is mostly about focus or style, not basic meaning.

Because Croatian does not have articles.

So Croatian does not have separate words matching English a/an and the.

Whether something is definite or indefinite is understood from:

• context
• word order
• the situation
• sometimes demonstratives like taj, ovaj, onaj

So procjena štete can mean something like the damage assessment or a damage assessment, depending on context.