Svlačionica je u teretani.

Because after u when it means in or inside, Serbian normally uses the locative case.

• basic form: teretana = gym
• locative singular: u teretani = in the gym

So Svlačionica je u teretani literally has the structure:

• Svlačionica = the changing room
• je = is
• u teretani = in the gym

It is the locative singular.

For many feminine nouns ending in -a, the locative singular ends in -i:

• škola → u školi
• soba → u sobi
• teretana → u teretani

You may also learn that the dative and locative often look the same in Serbian, so teretani can be both dative and locative in form. In this sentence, it is specifically locative because it comes after u and shows location.

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, je links the subject svlačionica with the location u teretani.

This is a very common Serbian pattern. Short unstressed words like je often behave as clitics, which means they usually come near the second position in the sentence.

So:

• Svlačionica je u teretani.

sounds natural.

Serbian learners often notice that these little forms of biti do not always behave exactly like English is. They tend to appear early in the sentence, usually after the first stressed element.

Here u means in.

But u does not always take the same case:

• u + locative = location
  
  • u teretani = in the gym
• u + accusative = motion toward/into
  
  • idem u teretanu = I am going into/to the gym

This is an important pattern in Serbian:

• Where? → usually locative
• Where to? → often accusative

Yes. Svlačionica is a feminine noun.

A very common clue is the ending -a, which often marks feminine nouns in Serbian.

Because it is feminine, any adjective describing it would also need a feminine form:

• velika svlačionica = a big changing room
• nova svlačionica = a new changing room

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

So svlačionica can mean:

• a changing room
• the changing room

and teretana can mean:

• a gym
• the gym

The exact meaning depends on context. Serbian speakers usually understand from the situation whether something is specific or not.

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

The most neutral version is:

• Svlačionica je u teretani.

But you could also hear:

• U teretani je svlačionica.

This still means roughly the same thing, but the emphasis changes. That version puts more focus on u teretani.

Even though Serbian allows flexibility, not every order sounds equally neutral. For a beginner, the original sentence is the best model to follow.

Roughly:

svla-chio-ni-tsa

A few helpful pronunciation points:

• č sounds like ch in chocolate, but a bit firmer
• c sounds like ts in cats

So svlačionica is approximately:

svla-CHIO-ni-tsa

And teretani is roughly:

te-re-TA-ni

Exact stress can vary by region and speech style, but this approximation is good enough for a learner starting out.

It is a very normal and useful word, and in this sentence it is perfectly natural.

Depending on region and context, you may also come across related words or slightly different usage, but svlačionica is the standard word you should learn for changing room / locker room.

So for practical purposes:

• svlačionica = changing room / locker room

For location, use u + locative:

• Svlačionica je u teretani. = The changing room is in the gym.

For movement toward/into, Serbian would use a different structure, typically with a verb of motion and u + accusative:

• Idem u teretanu. = I am going to/into the gym.

So the key contrast is:

• u teretani = in the gym
• u teretanu = into/to the gym

That -i versus -u difference is very important in Serbian.