Moramo surađivati.

Moramo means we must or we have to.

It comes from the verb morati = to have to / must.

Here is the basic idea:

• moram = I must
• moraš = you must
• mora = he/she/it must
• moramo = we must
• morate = you plural/formal must
• moraju = they must

So in Moramo surađivati, moramo tells you that the subject is we.

Because after morati, Croatian normally uses the infinitive.

So the structure is:

morati + infinitive

Examples:

• Moram ići. = I must go.
• Moramo raditi. = We must work.
• Moramo surađivati. = We must cooperate.

This is similar to English must cooperate, except Croatian does not need a separate word like to here.

Because Croatian verbs already show the subject in their endings.

The ending -mo in moramo already means we. So Moramo surađivati naturally means We must cooperate even without mi.

You could say:

• Mi moramo surađivati.

But that usually adds emphasis, like:

• We must cooperate.

So leaving out the pronoun is completely normal.

The tricky letter here is đ.

A helpful approximation:

• đ sounds a bit like the j in jam, but softer and more palatalized.

So surađivati is roughly pronounced like:

• soo-RA-jee-va-ti

That is only an approximation for English speakers, but it helps.

A few notes:

• su = like soo
• ra = rolled or tapped r
• đi = something like ji
• va = vah
• ti = tee

Also, Croatian spelling is very phonetic, so words are usually pronounced close to how they are written.

Surađivati means to cooperate or to collaborate.

Depending on context, it can mean:

• to work together
• to cooperate with someone
• to collaborate on something

Examples:

• Surađujemo dobro. = We cooperate well.
• Želim surađivati s tobom. = I want to cooperate with you.
• Moramo surađivati. = We must cooperate.

Yes, this is the most neutral and natural word order.

Croatian word order is more flexible than English, because endings carry a lot of grammatical information. So you may also see:

• Moramo surađivati. = neutral
• Surađivati moramo. = more emphasis on cooperate
• Mi moramo surađivati. = emphasis on we

But for a basic statement, Moramo surađivati is the standard choice.

Both can sometimes be translated as we need to or we should, but moramo is usually stronger.

• Moramo surađivati. = We must / We have to cooperate.
• Trebamo surađivati. = We should / We need to cooperate.

So:

• moramo = obligation, necessity, stronger pressure
• trebamo = recommendation, need, often softer

In many contexts both are possible, but they do not always feel equally strong.

You simply add ne before moramo:

• Ne moramo surađivati.

This means:

• We do not have to cooperate.
• We don’t need to cooperate.

Be careful: this does not mean we must not cooperate.

Compare:

• Ne moramo surađivati. = We don’t have to cooperate.
• Ne smijemo surađivati. = We must not cooperate / We are not allowed to cooperate.

That distinction is important.

Yes. If you want to say cooperate with someone, Croatian commonly uses s + instrumental.

Example:

• Moramo surađivati s njima. = We must cooperate with them.
• Surađujem s kolegama. = I cooperate with colleagues.

So:

• s = with
• the noun or pronoun after it usually goes in the instrumental case

You do not see that in Moramo surađivati because no partner is mentioned.

It is neutral and works in both formal and informal contexts.

You could say it:

• in everyday conversation
• in a meeting
• in politics
• in school
• in writing

Because both words are standard and neutral, the sentence is very broadly usable.

Yes, a little.

Surađivati is an imperfective verb, which is normal here because it refers to an ongoing action or process: cooperating, working together, not a single completed event.

That fits the meaning well, because cooperation is usually something continuous rather than something done once and finished.

For many learners, the main practical point is simply:

• surađivati is the normal verb to use for to cooperate / collaborate in sentences like this.

Yes, depending on context, surađivati can sometimes mean collaborate, not just cooperate.

For example:

• in a business or school context, it usually means cooperate / work together
• in a political or historical context, it could mean collaborate

So the exact English translation depends on the situation, even though the Croatian sentence stays the same.