Operator systemu dystrybucyjnego sprawdza dokument i numer klienta.

Because operator is the subject of the sentence — the person or entity doing the action.

In Operator systemu dystrybucyjnego sprawdza dokument i numer klienta, the structure is:

• operator systemu dystrybucyjnego = the distribution system operator
• sprawdza = checks / is checking
• dokument i numer klienta = the document and the customer’s number

Polish often puts the subject before the verb, just like English, although the word order is more flexible than in English.

They are in the genitive case because they depend on operator.

The phrase means literally:

• operator = operator
• systemu = of the system
• dystrybucyjnego = distribution / of distribution

So operator systemu dystrybucyjnego means operator of the distribution system.

More specifically:

• system → systemu in the genitive singular
• dystrybucyjny → dystrybucyjnego so that the adjective agrees with systemu

In Polish, adjectives must match the noun they describe in:

• case
• number
• gender

So because systemu is genitive singular masculine, dystrybucyjnego must match it.

Both are grammatically possible in Polish, but they mean slightly different things in structure.

• operator systemu dystrybucyjnego = operator of the distribution system
• operator dystrybucyjnego systemu would sound much less natural here

In this sentence, dystrybucyjnego describes systemu, not operatora. The whole phrase is a noun phrase built around operator, and then it is further specified by systemu dystrybucyjnego.

This is very common in formal or technical Polish:

• właściciel domu = owner of the house
• numer klienta = customer’s number
• operator systemu dystrybucyjnego = distribution system operator

Sprawdza is the 3rd person singular present tense form of the verb sprawdzać.

So it means:

• he checks
• she checks
• it checks
• or more generally checks

Because Polish usually does not need subject pronouns, sprawdza by itself already tells you the subject is he/she/it or a singular noun such as operator.

Related forms:

• sprawdzam = I check
• sprawdzasz = you check
• sprawdza = he/she/it checks
• sprawdzamy = we check
• sprawdzacie = you all check
• sprawdzają = they check

Because sprawdza is the imperfective verb form, while sprawdzi is perfective.

• sprawdzać → imperfective → ongoing, repeated, general action
• sprawdzić → perfective → completed action

So:

• Operator systemu dystrybucyjnego sprawdza dokument i numer klienta. = The operator checks / is checking the document and the customer’s number.

• Operator systemu dystrybucyjnego sprawdzi dokument i numer klienta. = The operator will check the document and the customer’s number.

In Polish, perfective verbs do not normally have a present tense meaning like English does. Their present forms often refer to the future.

They are direct objects, so they are in the accusative case. But for masculine inanimate singular nouns, the accusative often looks exactly like the nominative.

So:

• dokument
  nominative: dokument
  accusative: dokument

• numer
  nominative: numer
  accusative: numer

That is why they look unchanged even though they are objects.

This is very common in Polish:

• Mam samochód = I have a car
• Widzę dom = I see a house
• Sprawdzam numer = I check the number

Because Polish usually expresses possession with the genitive case, not with something like an English noun-noun combination.

So:

• numer klienta = the customer’s number / customer number

Here:

• numer = number
• klienta = of the customer

The base form is klient, but after numer it becomes klienta because it is in the genitive singular.

This is similar to:

• adres klienta = the customer’s address
• imię klienta = the customer’s name
• dane klienta = the customer’s data

Not by itself. I simply means and and links words of the same type.

In this sentence, it links two direct objects:

• dokument
• numer klienta

Both of these are objects of sprawdza, so both are in the accusative phrase structure.

However, inside numer klienta, the word klienta is still genitive, because it depends on numer, not on sprawdza.

So the structure is:

• sprawdza [dokument] i [numer klienta]

That means:

• dokument = object of the verb
• numer = object of the verb
• klienta = dependent on numer

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

So a noun like operator can mean:

• an operator
• the operator

and dokument can mean:

• a document
• the document

The exact meaning depends on context.

That is normal in Polish, and learners have to get used to understanding definiteness from:

• context
• word order
• the situation
• previous mention in the conversation

Yes. Polish word order is much more flexible than English word order because case endings show grammatical roles.

The neutral order here is:

• Operator systemu dystrybucyjnego sprawdza dokument i numer klienta.

But you could also say, for example:

• Dokument i numer klienta sprawdza operator systemu dystrybucyjnego.

This changes the emphasis, not the basic meaning. The second version puts more focus on dokument i numer klienta.

English relies heavily on word order to show subject and object. Polish relies much more on case and agreement, so word order often expresses emphasis or style.

It is very much a technical or official expression. In fields like energy or utilities, operator systemu dystrybucyjnego is a standard term for a distribution system operator.

So even though it is grammatically built from ordinary words, it often functions as a fixed phrase in formal language.

A learner might understand it word by word, but in real life it is usually better to treat it as one professional term.

It can mean either, depending on context.

Polish present tense often covers both:

• a general/habitual action: checks
• an action happening now: is checking

So this sentence could mean:

• The distribution system operator checks the document and the customer’s number.
• The distribution system operator is checking the document and the customer’s number.

If the context is procedural or instructional, checks is more likely. If it describes what is happening right now, is checking may be better in English.

Because of the case ending and the structure of the phrase.

• operator is nominative singular
• systemu is genitive singular
• dystrybucyjnego is also genitive singular

Since dystrybucyjnego matches systemu, it describes systemu.

If it described operator, it would have to match operator instead. For example, you would expect something like a nominative form agreeing with operator.

So the grammar shows that the phrase is:

• operator [systemu dystrybucyjnego]
• operator of the distribution system

not:

• dystrybucyjny operator systemu unless you intentionally wanted to say distribution operator of the system, which is not the same structure.

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

The base dictionary form of a noun is usually the nominative singular, and here that form is used directly:

• operator

So the case pattern in the sentence is:

• operator — nominative, subject
• systemu dystrybucyjnego — genitive, dependent on operator
• dokument — accusative, direct object
• numer klienta — accusative + genitive inside the phrase

This sentence is a good example of how several cases can appear together in one short Polish sentence.