Zamenska kartica stiže u poslovnicu banke sledeće nedelje.

Because zamenska is an adjective modifying kartica, and it has to agree with it in gender, number, and case.

• kartica is feminine singular
• here it is in the nominative singular
• so the adjective also appears in the feminine nominative singular: zamenska

That is why you get zamenska kartica, not zamenski kartica or zamensko kartica.

It means replacement card.

The adjective zamenski / zamenska / zamensko means something like:

• replacement
• substitute
• temporary or issued instead of the original

So zamenska kartica is not just any new card; it is specifically a card that replaces another one, for example after loss, damage, or expiration.

Because Serbian often uses the present tense for a planned, expected, or scheduled future event, especially when a time expression makes the future meaning clear.

So stiže sledeće nedelje naturally means something like:

• is arriving next week
• arrives next week
• is due to arrive next week

This is very common in everyday Serbian.

Both can refer to the future, but the nuance is a little different.

• stiže sounds more like an expected/scheduled arrival
• će stići is a more straightforward future tense

So:

• Zamenska kartica stiže sledeće nedelje = the replacement card is expected to arrive next week
• Zamenska kartica će stići sledeće nedelje = the replacement card will arrive next week

In many real situations, either one could work.

Because u can take different cases depending on the meaning:

• u + accusative = motion into / to
• u + locative = location in / at

Here the card is going to the branch, so Serbian uses u poslovnicu.

Compare:

• Kartica stiže u poslovnicu. = The card is arriving to the branch
• Kartica je u poslovnici. = The card is in/at the branch

So poslovnicu is accusative singular.

Because Serbian commonly uses noun + genitive to mean of the ... or to show what something belongs to.

So:

• poslovnica = branch / office
• banka = bank
• poslovnica banke = branch of the bank = bank branch

Here banke is the genitive singular form of banka.

It is genitive singular, and it is being used as a time expression.

In Serbian, expressions like this week, next week, last year, and similar phrases are often put in the genitive.

So:

• sledeća nedelja = next week as a basic dictionary-style phrase
• sledeće nedelje = next week, in the sense of during next week

This is why you do not see sledeća nedelja in the sentence.

Not exactly.

• banka = the bank, as an institution or a bank building in general
• poslovnica banke = a specific bank branch

So poslovnica is more precise. It refers to a branch office where customers go in person.

Because Serbian does not have articles like a and the.

That means Serbian usually leaves definiteness to:

• context
• word order
• the situation
• shared knowledge between speaker and listener

So zamenska kartica can mean a replacement card or the replacement card, depending on context. In a real banking message, it will usually be understood as the replacement card.

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

The sentence you have is natural and neutral:

• Zamenska kartica stiže u poslovnicu banke sledeće nedelje.

But these are also possible:

• Sledeće nedelje zamenska kartica stiže u poslovnicu banke.
• Zamenska kartica sledeće nedelje stiže u poslovnicu banke.
• U poslovnicu banke zamenska kartica stiže sledeće nedelje.

The basic meaning stays the same, but the focus changes slightly.

A rough English-style guide would be:

• stiže ≈ STEE-zheh
• sledeće ≈ SLEH-deh-cheh

A couple of useful sound notes:

• ž sounds like the s in measure
• ć is a soft sound somewhat like ty/ch, softer than English ch
• j in Serbian sounds like English y in yes

So if you see sledeće, the će part is not like English see; it is a soft cheh-type sound.

Yes, but it is less specific.

• u banku = to the bank
• u poslovnicu banke = to the bank branch

If the exact location matters, especially in customer-service or banking language, poslovnicu banke is more precise. It tells you the card is being sent to a branch office, not just somewhere connected with the bank in a general sense.