Nepristojno je prekidati nekoga dok govori, čak i kad se ne slažeš s njim.

Croatian often uses an impersonal structure where English uses it is.

So:

• Nepristojno je = It is rude
• literally, it is more like Rude is

Croatian does not need a dummy subject like English it in this kind of sentence.

After expressions like Nepristojno je (It is rude), Croatian often uses an infinitive to name the action in a general way.

So:

• Nepristojno je prekidati nekoga = It is rude to interrupt someone

This is very similar to English to interrupt after it is rude.

This is a question of aspect.

• prekidati = imperfective
• prekinuti = perfective

Here, prekidati is used because the sentence states a general rule about behavior, not one single completed interruption.

So prekidati fits the meaning:

• interrupting people / to interrupt people as a type of action

If you used prekinuti, it would sound more like to interrupt once / to cut someone off at a specific moment.

Nekoga is the accusative singular form of netko / netko? Actually, the form used for someone as a direct object is nekoga.

Here it is the object of prekidati:

• prekidati koga? = to interrupt whom?
• nekoga = someone

So:

• prekidati nekoga = to interrupt someone

Dok means while.

So:

• dok govori = while he/she is speaking

The verb govori is in the present tense because Croatian often uses the present tense for an action happening at the same time as another action.

In this sentence, it means:

• interrupting someone while that person is speaking

Because Croatian often omits subject pronouns when they are understood from context.

Here, govori refers back to nekoga:

• prekidati nekoga dok govori = to interrupt someone while they are speaking

English needs they/he/she, but Croatian can simply leave it out.

Čak i kad means even when.

It is made of:

• čak = even
• i = also / even here it strengthens the phrase
• kad = when

Together:

• čak i kad se ne slažeš s njim = even when you do not agree with him / them

Yes, in most cases kad and kada both mean when.

• kad is shorter and very common in everyday speech
• kada can sound a little fuller or slightly more formal, depending on context

In this sentence, kad is completely natural.

You could also say:

• čak i kada se ne slažeš s njim

and the meaning would stay the same.

The verb is slagati se, which means to agree.

So:

• slagati by itself is not the same thing
• slagati se = to agree

That se is part of the verb.

In the sentence:

• kad se ne slažeš s njim = when you do not agree with him

The placement of se is normal because se is a clitic, and Croatian clitics usually go near the beginning of the clause.

So se ne slažeš is the natural order here, not ne se slažeš.

Slažeš is 2nd person singular present:

• (ti) se slažeš = you agree

Because of the ne, it becomes:

• (ti) se ne slažeš = you do not agree

The sentence is addressing you in a general, informal sense, like English often does.

If you wanted the formal or plural form, you would say:

• se ne slažete

Because slagati se takes the preposition s(a) + instrumental.

So:

• slagati se s nekim = to agree with someone

That is just the standard pattern of the verb.

Examples:

• Slažem se s tobom. = I agree with you.
• Ne slaže se s njima. = He/She does not agree with them.

So in your sentence:

• s njim = with him

Njim is the instrumental singular form of on (he).

It appears because the preposition s in slagati se s nekim requires the instrumental.

So:

• on = he
• njim = with him

That is why it is:

• s njim not
• s njega or
• s njega

The verb-preposition pattern requires instrumental.

English often uses singular they:

• someone ... even when you don’t agree with them

Croatian usually refers back with a singular pronoun, not singular they in the same way.

Here, njim is singular and masculine in form. It can function as a generic reference to an unspecified person.

So the sentence is natural Croatian, even though English translation may prefer them for gender neutrality.

Because dok govori is tightly connected to prekidati nekoga and forms one close unit:

• interrupt someone while they are speaking

So no comma is needed there.

But:

• čak i kad se ne slažeš s njim

adds an extra idea: even when you disagree with them. That part is set off with a comma naturally.

So the punctuation reflects the structure and emphasis of the sentence.

Yes, Croatian word order is fairly flexible, but the given version is natural and neutral.

The original sentence:

• Nepristojno je prekidati nekoga dok govori, čak i kad se ne slažeš s njim.

sounds smooth and idiomatic.

You could rearrange parts for emphasis, but the meaning would stay similar. For example, you might move the subordinate clause for emphasis, but the original is the most straightforward version for a general statement.

A few helpful points:

• č sounds like ch in church
• ž sounds like the s in measure
• nj sounds like ny in canyon (roughly)

So approximately:

• čak ≈ chak
• slažeš ≈ SLA-zhesh
• njim ≈ nyeem

These are only rough English approximations, but they can help you get close.