Zbog pogrešne adrese za dostavu kurir nije isporučio pošiljku.

Because zbog requires the genitive case. The dictionary form is pogrešna adresa (wrong address), but after zbog it changes to pogrešne adrese.

Both words change because the adjective must agree with the noun:

• pogrešna adresa = nominative
• pogrešne adrese = genitive

So zbog pogrešne adrese means because of the wrong address.

Zbog means because of, due to, or on account of. It introduces the cause or reason for something.

In this sentence, the cause is:

• pogrešne adrese za dostavu = the wrong delivery address

So the sentence starts by giving the reason why the package was not delivered.

Za dostavu literally means for delivery. In context, adresa za dostavu means delivery address.

This is a very natural Serbian way to say it:

• adresa = address
• dostava = delivery
• adresa za dostavu = address for delivery / delivery address

So the phrase is not talking about just any address, but specifically the one used for delivery.

It is in the accusative singular because of the preposition za, which very often takes the accusative when it means for.

The base noun is:

• dostava = delivery

After za, it becomes:

• za dostavu = for delivery

This is a very common pattern in Serbian.

Serbian does not use articles like a or the. So kurir can mean a courier or the courier, depending on context, and pošiljku can mean a shipment/package or the shipment/package.

English has to choose an article, but Serbian usually leaves that unstated unless context makes it clear.

In the Serbian past tense, negation is made with the auxiliary je becoming nije.

So:

• je isporučio = he delivered
• nije isporučio = he did not deliver

You do not say ne isporučio here. The negative attaches to the auxiliary, not directly to the participle.

It is the past tense (more specifically, the Serbian perfect).

It is built from:

• the auxiliary je in negative form: nije
• the past participle: isporučio

So nije isporučio means did not deliver.

Also, isporučio is masculine singular, matching kurir, which is a masculine singular noun.

The past participle in Serbian agrees with the subject in gender and number.

Here the subject is:

• kurir = courier

Kurir is masculine singular, so the verb form is:

• isporučio

Compare:

• kurir je isporučio = the courier delivered
• kurirka je isporučila = the female courier delivered
• kuriri su isporučili = the couriers delivered

Because it is the direct object of the verb isporučiti (to deliver), so it appears in the accusative case.

The base form is:

• pošiljka = shipment, consignment, package

In the accusative singular, it becomes:

• pošiljku

So:

• isporučio pošiljku = delivered the shipment/package

Yes, isporučiti is a perfective verb. It refers to a completed action: to deliver as a finished result.

That fits this sentence well, because the point is that the delivery did not get completed:

• nije isporučio pošiljku = he did not deliver the package

If you used an imperfective verb, the meaning would shift more toward process, repetition, or ongoing action, not one concrete completed delivery event.

Yes, often it could, but the nuance is slightly different.

• paket = package, parcel
• pošiljka = shipment, consignment, mailed item

Pošiljka is a bit broader and can sound more formal or logistical. Paket is often more concrete and everyday. In many real-life situations, both might be understandable, but pošiljka fits delivery-service language very well.

Yes. Serbian word order is fairly flexible, and this sentence begins with the reason for emphasis:

• Zbog pogrešne adrese za dostavu kurir nije isporučio pošiljku.

A more neutral English-like order could be:

• Kurir nije isporučio pošiljku zbog pogrešne adrese za dostavu.

Both are grammatical. The original version puts the cause first, which makes because of the wrong delivery address the starting focus of the sentence.

Because this opening phrase is just a normal prepositional phrase, not a separate clause. In Serbian, you usually do not put a comma after this kind of short introductory phrase.

So:

• Zbog pogrešne adrese za dostavu kurir nije isporučio pošiljku.

is the normal punctuation.