Pregovaramo o plati i radnom vremenu.

Pregovaramo is the 1st person plural present form of pregovarati.

So it means we negotiate or we are negotiating.

A few useful points:

• the ending -amo shows the subject is we
• Serbian often leaves the subject pronoun out, because the verb ending already tells you who is doing the action
• the present tense in Serbian can cover both English simple present and present continuous, so context tells you whether it means a general action or something happening right now

With pregovarati, Serbian normally uses o + locative to mean to negotiate about / concerning something.

So:

• pregovarati o plati = negotiate about salary
• pregovarati o radnom vremenu = negotiate about working hours

Even if English may translate this naturally without about, Serbian still uses o in this structure.

Because o requires the locative case.

The basic form is:

• plata = salary

After o, it changes to locative singular:

• o plati = about the salary

So this is a case change, not a different word.

Because the whole phrase has to go into the locative singular after o.

The basic phrase is:

• radno vreme = working hours / working time

In the sentence, both words change because:

• radno is an adjective, so it must agree with the noun
• vreme is the noun, and it also changes form in the locative

So:

• radno vreme → o radnom vremenu

This is completely normal in Serbian: adjectives and nouns change together to match case, number, and gender.

The dictionary forms are:

• plata = salary
• radno vreme = working hours / work schedule / office hours, depending on context

More specifically:

• plati comes from plata
• radnom comes from radni / radno as the adjective form used with the neuter noun
• vremenu comes from vreme

So if you were looking these up, you would search for plata, radni, and vreme.

Because plata is just a single noun, while radno vreme is a noun phrase made of:

• an adjective: radno
• a noun: vreme

In Serbian, adjectives agree with the nouns they describe. That means when the noun changes case, the adjective changes too.

So:

• plata → plati
• radno vreme → radnom vremenu

This is one of the big patterns English speakers need to get used to: Serbian changes not just the noun, but also the words attached to it.

Yes.

The structure is:

• o plati i radnom vremenu

The single preposition o governs both items joined by i.

So you do not need to repeat it:

• o plati i radnom vremenu = natural
• o plati i o radnom vremenu = also possible, but less compact and usually unnecessary here

Yes, you could, but mi is usually unnecessary.

Serbian often drops subject pronouns because the verb ending already tells you the subject:

• pregovaramo already means we negotiate / we are negotiating

You would include mi only for emphasis, contrast, or clarity, for example:

• Mi pregovaramo, a oni čekaju.
  We are negotiating, and they are waiting.

So in a neutral sentence, leaving out mi is the most natural choice.

Yes. Serbian word order is more flexible than English word order.

The neutral version is:

• Pregovaramo o plati i radnom vremenu.

But you could also move things around for emphasis, for example:

• O plati i radnom vremenu pregovaramo.

That might sound more marked or contrastive, depending on context.

So the original sentence is the most straightforward, neutral order, but it is not the only possible order.

Because pregovarati is an imperfective verb, and that fits an ongoing process like negotiating.

Negotiating is usually seen as:

• something in progress
• something that may take time
• not a single completed event

That is why pregovaramo works well for we are negotiating.

This is a useful general idea in Serbian:

• imperfective verbs describe ongoing, repeated, or uncompleted actions
• perfective verbs usually describe completed actions

So here, the sentence focuses on the process, not the finished result.

Yes, it is a very common expression.

Depending on context, it can mean:

• working hours
• work schedule
• business hours
• office hours

In this sentence, the most natural meaning is usually working hours or work schedule.

Grammatically, it behaves like a normal adjective + noun combination, so it changes as a unit:

• radno vreme
• radnog vremena
• radnom vremenu

and so on.

A little, yes.

The nominative singular is:

• vreme

But in other cases it often uses the stem vremen- or forms based on it, for example:

• vremena
• vremenu

So o radnom vremenu may look less transparent to a beginner, but it is a standard declension pattern for this type of neuter noun.

That is why the form is vremenu, not something simpler based only on vreme.