Vakcina je u ambulanti.

Because after u when it means a fixed location (in / at), Serbian uses the locative case.

• base form: ambulanta
• locative singular: ambulanti

So:

• u ambulanti = in / at the clinic

This is very common with feminine nouns ending in -a:

• škola → u školi
• soba → u sobi
• ambulanta → u ambulanti

Vakcina is in the nominative singular. It is the subject of the sentence.

The sentence structure is:

• Vakcina = subject
• je = is
• u ambulanti = location phrase

So vakcina stays in its basic dictionary form here.

Yes. Vakcina is a feminine noun.

A quick clue is that it ends in -a, which very often marks feminine nouns in Serbian.

Because it is singular and feminine, if you added an adjective, the adjective would also be feminine singular:

• Nova vakcina je u ambulanti. = The new vaccine is in the clinic.

Je means is. It is the 3rd person singular present form of the verb biti (to be).

So:

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

In this sentence, vakcina is singular, so Serbian uses je.

In standard Serbian, no—you normally keep je in a sentence like this.

So:

• Vakcina je u ambulanti. = correct

Without je, the sentence would sound incomplete in normal standard usage.

Serbian sometimes omits forms of to be in very informal styles, headlines, or special contexts, but not in a basic sentence like this for learners.

Because Serbian u covers a range that English often splits between in and at.

So u ambulanti can be understood as:

• in the clinic
• at the clinic

Which English version sounds best depends on context. Serbian does not always make that distinction as sharply as English does.

Not exactly. Ambulanta usually means something like:

• clinic
• medical office
• outpatient clinic
• sometimes doctor’s office / infirmary, depending on context

It is not the usual word for hospital.

• bolnica = hospital
• ambulanta = clinic / outpatient medical facility

So u ambulanti usually means the vaccine is at a medical clinic or similar place, not necessarily in a hospital.

Because Serbian has no articles like English a/an/the.

So:

• Vakcina can mean a vaccine or the vaccine
• u ambulanti can mean in a clinic or in the clinic

The exact meaning depends on context.

That is very normal in Serbian, and learners need to get used to understanding definiteness from the situation rather than from articles.

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

The neutral order here is:

• Vakcina je u ambulanti.

But other orders are possible, for example:

• U ambulanti je vakcina.
• Je vakcina u ambulanti? = a possible question pattern, though intonation and other wording are also used

Changing the order usually changes emphasis, not the core meaning.

For example:

• Vakcina je u ambulanti. = neutral statement
• U ambulanti je vakcina. = emphasizes the location

A simple pronunciation guide is:

• Vakcina ≈ vahk-TSEE-nah
• je ≈ yeh
• u ≈ oo
• ambulanti ≈ ahm-boo-LAHN-tee

A few useful sound notes:

• j in Serbian sounds like English y in yes
• c in Serbian sounds like ts
• stress is not usually marked in normal writing, so learners often just imitate native pronunciation from audio

Yes. Serbian uses both Latin and Cyrillic scripts.

This sentence in Cyrillic is:

• Вакцина је у амбуланти.

The meaning and grammar are exactly the same. Only the script changes.

It is a prepositional phrase showing location.

It consists of:

• u = preposition
• ambulanti = noun in the locative singular

With u, Serbian often distinguishes between:

• location → u + locative
• movement into → u + accusative

Compare:

• Vakcina je u ambulanti. = The vaccine is in/at the clinic.
  
  • location, so locative
• Stavljaju vakcinu u ambulantu. = They are putting the vaccine into the clinic.
  
  • movement toward/into, so accusative

That location vs. movement contrast is very important in Serbian.