Mam dziewięć rachunków.

Mam means I have. It is the 1st person singular present-tense form of the verb mieć = to have.

So the pattern is:

• mieć = to have
• mam = I have

This is a very common irregular verb, so it is worth memorizing early.

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

In mam, the ending already shows that the subject is I, so ja is not necessary.

• Mam dziewięć rachunków. = I have nine bills/accounts.
• Ja mam dziewięć rachunków. = also correct, but ja adds emphasis, like I have nine bills.

So the version without ja is the most neutral and natural one.

Because after numbers 5 and higher, Polish normally uses the genitive plural form of the noun.

Here:

• singular: rachunek
• nominative plural: rachunki
• genitive plural: rachunków

So:

• jeden rachunek = one bill/account
• dwa rachunki = two bills/accounts
• cztery rachunki = four bills/accounts
• pięć rachunków = five bills/accounts
• dziewięć rachunków = nine bills/accounts

This is one of the most important number patterns in Polish.

Rachunek can mean several related things depending on context, including:

• bill
• invoice
• check (for example, in a restaurant)
• account
• sometimes even calculation

So rachunki can mean different things in different situations.

For example:

• in everyday finances: bills
• in business: invoices/accounts
• in school: sometimes calculations

The exact meaning comes from context, not from the word alone.

A very useful counting pattern is:

• 1 → singular
  jeden rachunek
• 2, 3, 4 → nominative plural
  dwa/trzy/cztery rachunki
• 5 and up → genitive plural
  pięć/sześć/dziewięć rachunków

So dziewięć rachunków follows the normal rule for 9.

This is why learning the plural form by itself is not enough; you often need both:

• rachunki
• rachunków

A rough pronunciation guide is:

• dziewięć ≈ JEV-yench
• rachunków ≈ ra-HOON-koof

A few helpful notes:

• ch in rachunków sounds like the ch in German Bach or Scottish loch
• the final w in -ów is pronounced like f
• Polish stress is usually on the second-to-last syllable
  • DZIE-więć
  • ra-CHUN-ków

You do not need a perfect accent right away, but it helps to notice these sound patterns early.

Yes. Polish word order is more flexible than English word order.

The neutral order here is:

• Mam dziewięć rachunków.

But you could also hear:

• Dziewięć rachunków mam.

That version sounds more marked or emphatic, as if highlighting nine bills/accounts in particular.

So:

• Mam dziewięć rachunków. = neutral, standard
• Dziewięć rachunków mam. = emphasis on the quantity/object

For learners, the original version is the best one to use first.

Because Polish does not have articles like English a/an and the.

So rachunków by itself can mean things like:

• bills
• the bills
• some bills
• nine bills

The exact meaning depends on context.

This is normal in Polish, and learners quickly get used to it.

Dziewięć is the basic form you learn first, and it is the correct form in this sentence.

But Polish numbers can change their form depending on grammar. So you may also see forms like:

• dziewięciu
• dziewięcioma

Those appear in other cases and structures.

For this sentence, though, dziewięć rachunków is exactly the form you want, so there is no need to change it.