Kurir će obavestiti primaoca.

Će is the 3rd person singular future auxiliary, from the verb hteti (to want). In sentences like this, Serbian often forms the future with:

subject + će + infinitive

So Kurir će obavestiti primaoca literally has the structure The courier will notify the recipient.

Because će is a clitic, and clitics in Serbian normally go in the second position of the clause.

So in:

Kurir će obavestiti primaoca.

the first element is Kurir, and the clitic će comes right after it.

If another word came first, the position of će could change:

Sutra će kurir obavestiti primaoca.
The courier will notify the recipient tomorrow.

Here sutra is first, so će comes after sutra.

Because Serbian future tense is commonly made with će + infinitive.

So:

• obavestiti = infinitive, to notify / to inform
• će obavestiti = will notify

A present-tense form such as obaveštava would mean is notifying or notifies, not will notify.

Also, obavestiti is a perfective verb, which fits well here because the sentence refers to one completed future action: the courier will notify the recipient.

The dictionary form is primalac, meaning recipient.

In the sentence, it appears as primaoca because it is not in the basic form. Serbian nouns change form depending on their role in the sentence.

So:

• primalac = basic form, nominative singular
• primaoca = accusative singular (for a masculine animate noun)

Because it is the direct object of the verb, and masculine animate nouns in Serbian usually take the accusative singular form that matches the genitive.

So:

• primalac = subject form
• primaoca = object form

This change is especially important for people and other animate masculine nouns.

Also, nouns ending in -lac often change their stem in oblique cases:

• primalac
• primaoca

That pattern is normal and something learners encounter quite often.

It is accusative singular.

It is in the accusative because it is the thing/person being affected by the action of the verb obavestiti. The courier is doing the action, and the recipient is receiving it.

So:

• Kurir = nominative singular, the subject
• primaoca = accusative singular, the direct object

Because kurir is the subject of the sentence, so it stays in the nominative:

• kurir = courier

But primaoca is the object, so it must go into the accusative.

English mostly shows this through word order, but Serbian shows it through case endings. That is why the two nouns behave differently even though both refer to people.

There is no article in Serbian. Serbian does not have separate words like the or a/an.

So Kurir će obavestiti primaoca could mean:

• The courier will notify the recipient
• A courier will notify the recipient

The exact choice in English depends on context.

The same applies to primaoca: it can be the recipient or a recipient, depending on the situation.

Yes. Serbian word order is more flexible than English because case endings show who is doing what.

This sentence in its current order is neutral:

Kurir će obavestiti primaoca.

But other orders are possible for emphasis, for example:

Primaoca će kurir obavestiti.

This puts more focus on the recipient.

Even when the word order changes, the case endings still show that:

• kurir is the subject
• primaoca is the object

One important rule still remains: the clitic će tends to stay in second position.

No. This is the standard and very common form, but you may also meet other future constructions.

For example, in speech you may hear:

Kurir će da obavesti primaoca.

This also means The courier will notify the recipient.

You may also see the fused future form when the verb carries the future ending directly, for example:

Obavestiće primaoca.
He/She/It will notify the recipient.

But the version in your sentence, će obavestiti, is a very normal, clear, standard form for learners to know.

It can match all of those depending on context.

Obavestiti basically means to inform someone / to notify someone / to let someone know. In a delivery context, notify is often the most natural English choice, which is why The courier will notify the recipient sounds very natural.

So the Serbian verb is broad enough to cover several close English translations.