Flaša ima jedan litar.

• flaša = bottle; a feminine singular noun in the nominative, because it is the subject
• ima = has; 3rd person singular present of imati (to have)
• jedan = one; the masculine singular form of the numeral
• litar = liter; a masculine noun, here used as the direct object

So the structure is basically:

subject + verb + object
Flaša + ima + jedan litar

Ima comes from imati (to have). In Serbian, imati is often used not only for possession, but also for what something contains or how much capacity it has.

So Flaša ima jedan litar can be understood as:

• The bottle has one liter
• The bottle holds one liter
• The bottle contains one liter

A more formal verb would be sadrži (contains), but ima is very common and natural.

Because jedan goes with litar, not with flaša.

• flaša is feminine
• litar is masculine

The numeral has to agree with the noun it modifies. Since litar is masculine, you use jedan.

Compare:

• jedna flaša = one bottle
• jedan litar = one liter

So in your sentence, jedan is masculine because it belongs to litar.

It is in the accusative singular, because it is the direct object of ima.

However, for many masculine inanimate nouns in Serbian, the accusative looks the same as the nominative. That is why you see:

• nominative: litar
• accusative: litar

So even though the case is accusative, the form does not change.

Literally, jedan means one.

But since Serbian has no articles like a/an/the, jedan can sometimes feel article-like in English translation. Still, its core meaning is numerical: one.

In this sentence, jedan litar most naturally suggests an exact quantity: one liter.

English often says a liter, but Serbian does not need an article, so whether jedan is used depends on how strongly the speaker wants to express the number one.

Yes, in many contexts you can omit it.

Serbian often leaves out jedan where English would use a/an. So a speaker may also say:

Flaša ima litar.

That can sound more like a simple statement about amount or capacity, while Flaša ima jedan litar makes the quantity explicitly one.

So the difference is roughly:

• ima litar = has a liter / holds a liter
• ima jedan litar = has exactly one liter

Because Serbian does not have articles.

So flaša can mean:

• a bottle
• the bottle

The context tells you which one is intended.

That is a very common adjustment for English speakers. In Serbian, you usually do not mark definiteness with a separate word the way English does.

The verb agrees with the subject, not with the object.

Here the subject is flaša, which is singular, so the verb is singular:

• flaša ima = the bottle has

The object jedan litar does not control the verb form.

If the subject were plural, the verb would change:

• Flaše imaju jedan litar. = The bottles have one liter.

This is important, because Serbian number phrases change form.

With litar, you get:

• jedan litar = one liter
• dva litra = two liters
• tri litra = three liters
• četiri litra = four liters
• pet litara = five liters

So you could say:

• Flaša ima dva litra.
• Flaša ima pet litara.

A learner should notice that the noun form changes after different numbers:

• after 1: litar
• after 2, 3, 4: litra
• after 5 and up: litara

Flaša ima jedan litar is the most neutral word order.

Serbian word order is fairly flexible, but changing it changes the emphasis. For example:

• Flaša ima jedan litar. = neutral
• Jedan litar ima flaša. = strongly marked, unusual unless you are emphasizing jedan litar
• Ima jedan litar flaša. = possible only in special contexts, not the normal beginner pattern

So for everyday use, subject + verb + object is the safest choice here.

The letter š is pronounced like sh in shoe.

So flaša sounds roughly like:

FLA-sha

Very approximate English-style pronunciations:

• flaša ≈ FLAH-sha
• ima ≈ EE-ma
• jedan ≈ YE-dahn
• litar ≈ LEE-tar

That is only an approximation, but it is a good starting point for an English speaker.