Chci zablokovat debetní kartu.

Chci means I want.

Its base form is chtít, which means to want.
This is the 1st person singular present tense form:

• (já) chci = I want
• (ty) chceš = you want
• (on/ona) chce = he/she wants

In this sentence, Czech does not need the subject pronoun já because chci already clearly shows that the subject is I.

Czech often leaves out subject pronouns when they are obvious from the verb form.

So:

• Chci zablokovat debetní kartu. = I want to block the debit card / my debit card.

You could say Já chci zablokovat debetní kartu, but that usually sounds more emphatic, like I want to block it.

This is about verb aspect, which is very important in Czech.

• blokovat = to be blocking / to block in an ongoing, repeated, or general sense
• zablokovat = to block as a completed action

Here, the speaker wants one completed result: the card gets blocked. So zablokovat is the natural choice.

Compare:

• Chci zablokovat kartu. = I want to block the card.
• Blokuji kartu. = I am blocking the card.
• Blokovat kartu could sound more like the process or general activity of blocking a card.

Because karta is the direct object of the verb, so it has to be in the accusative case.

The noun karta is feminine:

• nominative: karta
• accusative: kartu

So:

• karta = card (subject form / dictionary form)
• zablokovat kartu = to block a card

This is one of the most common feminine noun patterns in Czech:
-a in nominative often becomes -u in accusative singular.

Because adjectives in Czech usually agree with the noun they describe in:

• gender
• number
• case

Here, kartu is:

• feminine
• singular
• accusative

So the adjective must match it:

• debetní karta = debit card (dictionary form)
• debetní kartu = debit card (accusative form)

In this particular adjective, the form debetní looks the same in nominative and accusative singular feminine, but it is still agreeing grammatically with kartu.

The dictionary form is karta.

When learning vocabulary, you would normally memorize:

• karta = card

Then in actual sentences, it changes depending on case:

• karta = nominative
• kartu = accusative
• kartě = dative/locative
• kartou = instrumental

So if you see kartu, it is still the word karta, just in a different grammatical form.

Czech has no articles like a or the, so the exact English translation depends on context.

So debetní kartu could mean:

• a debit card
• the debit card
• sometimes effectively my debit card, if the situation makes that obvious

For example, if you are speaking to your bank, Chci zablokovat debetní kartu will usually be understood as I want to block my debit card.

If you want to make my explicit, you can say:

• Chci zablokovat svou debetní kartu.

Yes, but svou is usually the better choice here.

• svou debetní kartu = my own debit card
• moji debetní kartu = my debit card

Czech often prefers the reflexive possessive svůj/svá/své when the thing belongs to the subject of the sentence.

Since the subject is I, and the card belongs to that same subject, Czech commonly uses svou:

• Chci zablokovat svou debetní kartu.

Using moji is possible, but svou sounds more natural in many contexts.

It is understandable and natural, but in a real interaction, a more polite version is often better.

A common polite version is:

• Chtěl bych zablokovat debetní kartu.
  = I would like to block a/the/my debit card.
  (said by a man)

A woman would say:

• Chtěla bych zablokovat debetní kartu.

This sounds more polite than the very direct Chci...
So:

• Chci zablokovat debetní kartu. = direct
• Chtěl/Chtěla bych zablokovat debetní kartu. = more polite

Yes. Czech word order is fairly flexible because case endings show grammatical roles.

The most neutral order here is:

• Chci zablokovat debetní kartu.

But you could also hear:

• Debetní kartu chci zablokovat.
• Chci debetní kartu zablokovat.

These versions may shift emphasis slightly:

• Debetní kartu chci zablokovat. emphasizes the debit card
• Chci zablokovat debetní kartu. is the most straightforward, neutral version

So the sentence can change order, but the original is a very good default.

A rough pronunciation guide is:

• Chci ≈ kh-tsi
• zablokovat ≈ za-blo-ko-vat
• debetní ≈ de-bet-nee
• kartu ≈ kar-too

A fuller approximation:

kh-tsi za-blo-ko-vat de-bet-nee kar-too

A few useful notes:

• ch in Czech is like the ch in German Bach or Scottish loch
• c is pronounced ts
• í is a long ee sound
• stress in Czech is usually on the first syllable of each word:
  • CHCI
  • za-blo-ko-vat
  • DE-bet-ní
  • KAR-tu

Not exactly.

• zablokovat kartu = to block/freeze the card
• zrušit kartu = to cancel the card

If you have lost the card temporarily or want to stop it from being used, zablokovat is the right word.

If the card is being permanently cancelled, then zrušit may be more appropriate.

So in a banking emergency, zablokovat is often exactly the word you need.

It is in the accusative singular feminine.

Why?

Because it is the direct object of zablokovat:

• What do I want to block?
• debetní kartu

Breakdown:

• debetní = adjective agreeing with the noun
• kartu = accusative singular of karta

So this is a good example of how Czech marks the object of a verb through case endings.

Yes, depending on what you mean.

• debetní karta = debit card
• platební karta = payment card / bank card

Platební karta is broader and can refer to a payment card in general, while debetní karta is specifically a debit card.

So if you specifically mean a debit card, debetní karta is the more precise term.