Klient pyta, czy może zapłacić kartą.

Czy introduces an indirect yes/no question. Here it means whether or if:

• Klient pyta, czy może zapłacić kartą.
• The customer asks whether he/she can pay by card.

This czy is not the same as English conditional if in sentences like If it rains, we’ll stay home. In Polish, czy is used for questions, not conditions.

Móc is the dictionary form of the verb, meaning to be able to / can.

In a real sentence, you usually need a conjugated form.
Here, może is the 3rd person singular form of móc:

• ja mogę = I can
• ty możesz = you can
• on/ona/ono może = he/she/it can

So:

• może zapłacić = can pay

This is about aspect, which is very important in Polish.

• płacić = imperfective, focuses on the process or repeated action of paying
• zapłacić = perfective, focuses on completing the payment

In this sentence, the customer is asking whether they can make a payment / complete the payment by card, so zapłacić is the natural choice.

Compare:

• Czy mogę płacić kartą? = Can I pay by card? / Am I allowed to pay by card?
  This can sound more general or habitual.
• Czy mogę zapłacić kartą? = Can I pay by card?
  This fits a specific payment happening now.

Because Polish uses the instrumental case after many expressions meaning by means of something.

So:

• karta = nominative singular
• kartę = accusative singular
• kartą = instrumental singular

In this sentence, kartą means with a card / by card.

This is very common in Polish:

• jechać autobusem = to go by bus
• pisać długopisem = to write with a pen
• zapłacić kartą = to pay by card

Not necessarily. Kartą by itself usually just means by card, without specifying exactly what kind.

Depending on context, it could mean:

• debit card
• credit card
• payment card in general

If you want to be more specific, Polish can say:

• kartą kredytową = by credit card
• kartą debetową = by debit card
• kartą płatniczą = by payment card

Polish often omits subject pronouns when the meaning is already clear from the verb form or context.

In może zapłacić, there is no separate word for he/she, but the sentence naturally refers back to klient.

So Polish does not need to say something like:

• Klient pyta, czy on może zapłacić kartą.

That version is possible, but normally unnecessary. Using on would add emphasis, and in many contexts it would sound less natural.

Klient is in the nominative singular, because it is the subject of the sentence.

• klient = the customer
• pyta = asks

So Klient pyta means The customer asks.

Pyta is present tense, 3rd person singular, from pytać = to ask.

So:

• ja pytam = I ask / am asking
• ty pytasz = you ask / are asking
• on/ona/ono pyta = he/she/it asks / is asking

In Polish, the present tense can often match either simple present or present continuous in English, depending on context. So pyta could correspond to:

• asks
• is asking

Yes, Polish word order is more flexible than English, although some orders sound more natural than others.

The neutral version is:

• Klient pyta, czy może zapłacić kartą.

You could also hear:

• Czy klient pyta, czy może zapłacić kartą?
  = Is the customer asking whether he/she can pay by card?

But inside the reported clause, czy może zapłacić kartą is already the most natural standard order.

Polish changes word order mostly for:

• emphasis
• contrast
• style
• rhythm

So while word order can move, not every rearrangement sounds equally natural.

No, it is an indirect question.

A direct question would be:

• Czy mogę zapłacić kartą? = Can I pay by card?

But in your sentence, the speaker is reporting the question:

• Klient pyta, czy może zapłacić kartą.
• The customer asks whether he/she can pay by card.

So the whole sentence is a statement, even though it contains a question clause.

Because móc works like a modal verb in Polish, similar to can in English.

So the pattern is:

• conjugated form of móc
• infinitive of the main verb

Here:

• może = can
• zapłacić = pay

Together:

• może zapłacić = can pay

This is the normal structure in Polish.

Yes, klient is the masculine noun meaning male customer or sometimes customer in a general sense.

If you want to clearly say female customer, Polish uses:

• klientka

So:

• Klient pyta, czy może zapłacić kartą. = The male customer asks whether he can pay by card.
• Klientka pyta, czy może zapłacić kartą. = The female customer asks whether she can pay by card.

In many real contexts, klient may be used generically, but klientka is the specifically feminine form.

A rough pronunciation guide is:

• Klient ≈ KLYENT
• pyta ≈ PIH-ta
• czy ≈ chi with a hard retroflex ch sound, not exactly English ch
• może ≈ MO-zhe
• zapłacić ≈ za-PWA-chich
• kartą ≈ KAR-ton with a nasal ending

A few useful notes:

• Polish stress is usually on the second-to-last syllable
• ż sounds like the s in measure
• ą is a nasal vowel, and at the end of a word it often sounds somewhat like on or om, depending on context

So the whole sentence is roughly:

KLYENT PIH-ta, chi MO-zhe za-PWA-chich KAR-ton

You might see that kind of translation sometimes, but in natural English, whether is better here:

• The customer asks whether he can pay by card.

English also allows if in this kind of sentence:

• The customer asks if he can pay by card.

But in Polish, the word is czy, specifically marking an indirect yes/no question. So it is best to understand it as whether / if in the question sense, not the conditional sense.