Banka je potvrdila blokadu kartice.

Because potvrdila must agree with the subject, and the subject is banka.

• banka = a feminine noun
• In the Serbian past tense, you usually use:
  • the auxiliary je
  • plus the -l participle, which changes for gender and number

So:

• banka je potvrdila = the bank confirmed
• If the subject were masculine, it would be potvrdio
• If it were neuter, potvrdilo

Examples:

• Direktor je potvrdio... = The director confirmed...
• Kompanija je potvrdila... = The company confirmed...

je is the 3rd person singular form of biti (to be) used as an auxiliary in the past tense.

So the structure is:

• Banka = subject
• je potvrdila = past tense verb phrase
• blokadu kartice = object

This is the normal Serbian way to form the past tense:

• sam, si, je, smo, ste, su
  • participle

Examples:

• Ja sam potvrdio = I confirmed
• Ona je potvrdila = She confirmed
• Oni su potvrdili = They confirmed

Because blokadu is the accusative singular form, and it is the direct object of potvrdila.

The dictionary form is:

• blokada = blockage / blocking

But after a transitive verb like potvrditi (to confirm), the direct object usually goes in the accusative:

• potvrditi blokadu = to confirm the blockage

For feminine nouns ending in -a, the accusative singular is often -u:

• blokada → blokadu
• kartica → karticu
• poruka → poruku

So:

• Banka je potvrdila blokadu... = The bank confirmed the blockage...

Here, kartice is genitive singular, and it means of the card.

So:

• blokada kartice = blocking / blockage of the card

This is a very common Serbian pattern:

• noun + genitive noun

Examples:

• broj telefona = phone number
• adresa firme = company address
• blokada kartice = card blockage / blockage of the card

A useful thing to notice: kartice can also be nominative plural in other contexts, but here it is genitive singular because it depends on blokadu.

Why do we know that? Because the phrase means the blockage of the card, and Serbian commonly expresses of the card with the genitive.

Here is the case breakdown:

• Banka — nominative singular
  • it is the subject
• blokadu — accusative singular
  • it is the direct object of potvrdila
• kartice — genitive singular
  • it depends on blokadu and means of the card

So the structure is:

• [Subject in nominative] + [verb] + [object in accusative] + [dependent noun in genitive]

Because Serbian has no articles like English a/an and the.

So:

• banka can mean a bank or the bank
• kartica can mean a card or the card

You understand which one is meant from context.

In this sentence, English naturally says The bank confirmed the blocking of the card or The bank confirmed the card blockage, but Serbian simply says:

• Banka je potvrdila blokadu kartice.

No article is needed.

Yes. It is a very common pattern: a noun followed by a genitive noun.

Here:

• blokada = blockage / blocking
• kartice = of the card

Together:

• blokada kartice = blockage of the card / card blockage

This is similar to many other Serbian phrases:

• otkaz leta = cancellation of the flight
• promena adrese = change of address
• provera identiteta = identity check
• uplata novca = payment of money / money deposit

English often uses either:

• of
• or a compound noun

So blokada kartice may be translated as either:

• blocking of the card
• card blockage
• sometimes even card block

depending on context.

Yes, but it is not exactly the same nuance.

• blokada kartice = the blockage / block / blocking status of the card
• blokiranje kartice = the act/process of blocking the card

So:

• potvrdila blokadu kartice sounds like confirming that the card block exists / was applied
• potvrdila blokiranje kartice would focus more on the action or procedure of blocking

In official, banking, and administrative language, blokada kartice is very natural.

Yes. Serbian word order is more flexible than English because cases show the grammatical roles.

The neutral order here is:

• Banka je potvrdila blokadu kartice.

But you may also hear:

• Blokadu kartice je potvrdila banka.
• Banka je blokadu kartice potvrdila.

These versions shift emphasis:

• starting with blokadu kartice emphasizes the blockage
• ending with banka can emphasize that it was the bank that confirmed it

Still, the original sentence is the most straightforward and neutral.

The basic dictionary form is potvrditi = to confirm.

This verb is usually perfective, meaning it presents the action as completed.

That fits this sentence well:

• je potvrdila = confirmed (a completed action)

The related imperfective verb is:

• potvrđivati = to be confirming / to confirm repeatedly / habitually

Compare:

• Banka je potvrdila blokadu kartice. = The bank confirmed the card blockage.
  completed event
• Banka je potvrđivala podatke. = The bank was confirming the data / used to confirm the data.
  ongoing or repeated action

potvrdila is the past participle form used in the Serbian past tense.

Its features here are:

• verb: potvrditi
• tense construction: past tense with je
• gender: feminine
• number: singular

It agrees with banka, not with blokadu or kartice.

That is important:

• Serbian past-tense participles agree with the subject
• not with the object

So even though blokadu is also feminine, that is not why the form is potvrdila.
It is feminine because banka is feminine.

Not necessarily.

In Serbian, the first word of a sentence is capitalized automatically, so Banka is capitalized here simply because it starts the sentence.

If the word appeared in the middle of a sentence and was not part of an official name, it would normally be lowercase:

• Ta banka je potvrdila blokadu kartice.

If it were part of a proper name, capitalization would depend on the official name, for example:

• Banka Poštanska štedionica
• Narodna banka Srbije

So in this sentence alone, the capital B does not tell us whether it is a common noun or a name.

In this sentence, no—the natural reading is of the card.

Even though kartice can be nominative plural in other contexts, here the grammar points to genitive singular:

• blokada kartice = blockage of the card

If you wanted blockage of cards in a plural sense, Serbian would normally express that differently depending on the exact meaning and context, and this sentence would not be interpreted that way by default.

So for a learner, the safest reading is:

• kartice = of the card (genitive singular)

A close breakdown is:

• Banka = bank
• je = is/has (auxiliary used to form the past tense)
• potvrdila = confirmed
• blokadu = blockage / blocking
• kartice = of the card

So literally:

• Bank has-confirmed blockage of-card

Natural English:

• The bank confirmed the blockage of the card
• The bank confirmed the card blockage
• depending on context, possibly The bank confirmed that the card was blocked