Kralj priča sa svima sem mene.

Because sa requires the instrumental case, and svima is the form used here.

• svi = all / everyone in the basic dictionary form
• sa svima = with everyone

So in this sentence:

• Kralj = subject
• priča = verb
• sa svima = with everyone

Even though svima can also match other cases in other contexts, here it is instrumental because it follows sa.

Because sem normally takes the genitive case.

So:

• ja = I
• mene = genitive/accusative form of ja

In this sentence, sem mene means except me.

This is very common with words like:

• sem mene
• osim mene

Also, after a preposition or a word like sem, Serbian uses the full stressed pronoun form, not a short clitic form. So you say mene, not me.

Yes, in this sentence they mean the same thing: except.

So these are both natural:

• Kralj priča sa svima sem mene.
• Kralj priča sa svima osim mene.

A learner will probably hear osim very often, and it may feel a little more neutral or textbook-friendly. Sem is also very common and completely normal.

Both are followed by the genitive:

• sem mene
• osim mene

Sa and s are two forms of the same preposition meaning with.

In many cases, Serbian uses sa instead of s to make pronunciation easier, especially before words beginning with sounds like:

• s
• š
• z
• ž

Since svima begins with s, sa svima sounds natural and easy to pronounce.

So:

• sa svima = natural
• s svima = possible in theory, but awkward

That is why sa svima is the form you should expect here.

Both can relate to speaking, but they are not exactly the same.

• pričati often means to talk, to chat, or to tell
• govoriti often means to speak or to say

In a sentence about interacting with people, priča sa svima sounds very natural: he talks with everyone.

If you used govori, the meaning would shift slightly depending on context:

• govori sa svima = speaks with everyone
• priča sa svima = talks with everyone

So priča is a very natural choice here.

Because Serbian does not have articles like English a and the.

So kralj can mean:

• a king
• the king

The exact meaning depends on context. In your sentence, English would usually translate it as the king, but Serbian does not need a separate word for that.

Not completely. Serbian word order is more flexible than English word order.

The sentence:

• Kralj priča sa svima sem mene.

is a very normal, neutral way to say it.

But Serbian can move parts around for emphasis. For example, if you wanted to emphasize me, you might hear a different arrangement in real speech. Still, the version you have is the most straightforward and natural for a learner.

So the basic idea is:

• Serbian word order is flexible
• this sentence uses a neutral, standard order

Here kralj is in the nominative singular, because it is the subject of the sentence.

So:

• kralj = king (nominative singular)
• it is the person doing the action of priča

The rest of the sentence changes form because of the prepositions:

• sa svima → instrumental
• sem mene → genitive

Yes. That would also be correct.

• priča sa svima = talks with everyone
• razgovara sa svima = converses with everyone

Razgovarati can sound a bit more formal or a bit more explicitly like to have a conversation, while pričati is very common and everyday.

So both are good, but priča is simple and natural.

It is grammatically a plural form, even though English everyone looks singular.

Serbian often treats ideas like everyone / all people through forms connected to all in the plural:

• svi = all / everyone
• sa svima = with everyone

So although English says everyone, Serbian uses a form that is grammatically plural in origin.

In some contexts, words like sem or osim can be understood as besides / apart from, but in this sentence the natural meaning is clearly except me.

So:

• Kralj priča sa svima sem mene.
  most naturally means
• The king talks to everyone except me.

That is the reading a learner should take here.