Recept je u mojoj torbi.

Because after u meaning in for a static location, Serbian uses the locative case.

• torba = bag
• torbi = in/on/about the bag, depending on context

The possessive word has to match the noun in case, gender, and number, so:

• moja torba = my bag
• u mojoj torbi = in my bag

So both words change:

• moja → mojoj
• torba → torbi

Torbi is locative singular.

The noun torba is feminine singular, and its locative singular form is torbi.

In this sentence, u means location, so it requires the locative:

• u torbi = in the bag

A very useful contrast is:

• u torbi = in the bag → location
• u torbu = into the bag → movement/direction

So:

• Recept je u mojoj torbi = The recipe/prescription is in my bag
• Stavljam recept u moju torbu = I am putting the recipe/prescription into my bag

Mojoj is the feminine singular locative form of moj / moja / moje, meaning my.

Since torba is:

• feminine
• singular
• here in the locative

the possessive must match it:

• nominative: moja torba
• locative: u mojoj torbi

This kind of agreement is very important in Serbian.

Je is the 3rd person singular present form of the verb biti = to be.

So here it means is.

• Recept je u mojoj torbi = The recipe/prescription is in my bag

Unlike English, Serbian often does not need a subject pronoun like it. The noun recept is enough, so you do not say an extra word for it.

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

So recept can mean:

• a recipe/prescription
• the recipe/prescription

The exact meaning depends on context.

That is very normal in Serbian. Learners often want to translate every the, but Serbian usually just leaves it out.

Yes. Recept can mean:

• recipe
• medical prescription

The intended meaning depends on context.

This is something English speakers often notice because it can feel a little like a false friend. In everyday Serbian:

• in a kitchen context, recept usually means recipe
• in a pharmacy or medical context, it usually means prescription

No, Serbian word order is fairly flexible.

Recept je u mojoj torbi is a neutral, natural word order.

But other versions are also possible for emphasis, for example:

• U mojoj torbi je recept. = In my bag is the recipe/prescription.
• U mojoj torbi recept je would sound unusual in most normal situations.

In everyday speech, the original sentence is the most straightforward and natural.

The dictionary form is torba.

That is the nominative singular form, the form you would normally find in a word list or dictionary.

Some forms are:

• torba = bag
• torbe
• torbi
• torbu

For this sentence, you need torbi because the noun follows u in the sense of location.

A rough pronunciation for an English speaker is:

REH-tsept yeh oo MOH-yoy TOR-bee

A few helpful details:

• r is rolled or tapped
• c in Serbian is pronounced like ts
• j is pronounced like English y
• je sounds roughly like yeh
• mojoj sounds roughly like MOH-yoy

So:

• recept ≈ REH-tsept
• je ≈ yeh
• u ≈ oo
• mojoj ≈ MOH-yoy
• torbi ≈ TOR-bee

Because Serbian normally does not require an explicit subject pronoun when the subject is already clear.

In English, you say:

• It is in my bag or
• The recipe is in my bag

In Serbian, if you name the noun, that is enough:

• Recept je u mojoj torbi

The verb form je already tells you it is is, and recept tells you what is being talked about.

Recept is masculine singular.

That matters mainly for agreement in other contexts, especially with adjectives and past-tense forms. In this sentence, it does not cause many visible changes, because recept is simply the subject in its basic form.

Examples:

• dobar recept = a good recipe
• taj recept = that recipe

So yes, gender matters in Serbian, and recept is masculine.