Ja sam gladna i želim ručak sada.

Yes. Serbian often drops subject pronouns when they are clear from the verb.

So Ja sam gladna and Sam gladna are not the same, though:

• Ja sam gladna = I am hungry, with explicit I
• Gladna sam = more natural in many everyday situations

In this sentence, ja can add a little emphasis or clarity. Very often, a native speaker would simply say:

Gladna sam i želim ručak sada.

Sam is the 1st person singular present tense of biti = to be.

So:

• ja sam = I am
• ti si = you are
• on/ona/ono je = he/she/it is

In this sentence:

• Ja sam gladna = I am hungry

Also, sam is a clitic, so it usually likes to appear near the beginning of the sentence, often in second position.

Because the adjective agrees with the speaker’s gender.

• gladna = said by a female
• gladan = said by a male

So:

• Ja sam gladna = a woman/girl says I am hungry
• Ja sam gladan = a man/boy says I am hungry

This is very common in Serbian: adjectives in this kind of sentence match the gender of the person speaking.

Yes. Gladna is an adjective meaning hungry.

In Serbian, after the verb to be, adjectives are used much like in English:

• Ona je srećna = She is happy
• Ja sam umorna = I am tired
• Ja sam gladna = I am hungry

The adjective must agree with the subject in:

• gender
• number

So you get forms like:

• gladan = masculine singular
• gladna = feminine singular
• gladno = neuter singular
• gladni / gladne = plural, depending on gender group

Good question. Ručak is the direct object of želim, so it is in the accusative case.

The reason it looks unchanged is that masculine inanimate nouns often have the same form in nominative and accusative singular.

So:

• nominative: ručak = lunch
• accusative: ručak = lunch

That is completely normal.

Compare with a masculine animate noun, where the accusative usually changes:

• nominative: student
• accusative: studenta

But with ručak, no visible change appears.

Želim means I want or I desire.

It is the 1st person singular present tense of želeti = to want.

So:

• želim = I want
• želiš = you want
• želi = he/she wants

In this sentence:

• želim ručak = I want lunch

A small nuance: želim can sound a bit more neutral or slightly more formal than some other ways of saying want, depending on context.

It is grammatically correct, but in everyday speech it may sound a little direct or slightly bookish depending on context.

A native speaker might also say:

• Gladna sam i hoću ručak sad.
• Gladna sam i hoću da ručam sad.
• Gladna sam i želim da ručam sada.

These are slightly different in nuance:

• želim ručak = I want lunch
• želim da ručam = I want to eat lunch / have lunch
• hoću ručak = I want lunch, often more direct and conversational

So the original sentence is fine, but not the only natural option.

They are related, but not the same part of speech.

• ručak = lunch as a noun
• ručati = to have lunch / to eat lunch
• ručam = I am having lunch / I have lunch

So:

• Želim ručak = I want lunch
• Želim da ručam = I want to have lunch

English often uses lunch as both a noun and part of an expression like have lunch, but Serbian separates these ideas more clearly.

Yes, Serbian word order is flexible.

Sada means now, and it can appear in different places depending on emphasis.

Examples:

• Ja sam gladna i želim ručak sada.
• Ja sam sada gladna i želim ručak.
• Sada želim ručak.
• Gladna sam i sada želim ručak.

All of these are possible, but they do not emphasize exactly the same thing.

In everyday speech, sad is often more common than sada:

• Gladna sam i želim ručak sad.

They mean the same thing: now.

• sada = full form
• sad = shorter, very common in speech

Both are correct. Usually:

• sada can sound a bit more careful, full, or neutral
• sad sounds more conversational

So both of these work:

• Želim ručak sada.
• Želim ručak sad.

Yes, and that is often more natural.

Because Serbian usually does not need the subject pronoun, many speakers would prefer:

Gladna sam i želim ručak sada.

The version with ja is not wrong. It just has a bit more emphasis on I.

For example:

• Ja sam gladna, a ona nije. = I am hungry, but she isn’t.

There, the pronoun is useful because it creates contrast.

A man would say:

Ja sam gladan i želim ručak sada.

The only change is:

• gladna → gladan

That is because the adjective has to match the speaker’s gender.

A simple pronunciation guide:

• želim: ZHEH-leem
  • ž sounds like the s in measure
• ručak: ROO-chak
  • č sounds like ch in church
  • ru is like roo

So the full sentence sounds approximately like:

ya sam GLAD-na ee ZHEH-leem ROO-chak SA-da

A few notes:

• j in Serbian sounds like English y
• c, č, ć, dž, đ, š, ž are important distinct sounds in Serbian spelling

It is mostly neutral, but it can sound a little textbook-like because of the full forms and explicit structure.

Why?

• ja is included, though often unnecessary
• sada is the full form of now
• želim ručak is correct, but not always the most casual everyday phrasing

A more casual everyday version might be:

Gladna sam i hoću ručak sad.

A slightly smoother neutral version might be:

Gladna sam i želim ručak sada.

So the original sentence is perfectly understandable and correct, but not the only way a native speaker might say it.