Proszę o kolejną kopię dokumentu.

Here proszę means something like I am asking for or, in natural English, please in a polite request.

The verb is prosić = to ask / to request.
So Proszę o... literally means I ask for....

This is a very common polite pattern in Polish:

• Proszę o pomoc. = Please help / I am asking for help.
• Proszę o rachunek. = The bill, please.

So in this sentence, proszę is not just a standalone please — it is part of the request structure proszę o + noun.

Because the Polish verb pattern here is:

prosić o + accusative

That means to ask for something.

So:

• prosić o kawę = to ask for coffee
• prosić o dokument = to ask for a document

In your sentence:

• o kolejną kopię dokumentu

The preposition o is required by this meaning of prosić.

Be careful: o can mean different things in other contexts, but here it is simply part of the expression prosić o = to ask for.

Because kolejną is in the accusative singular feminine form.

The noun kopia (copy) is:

• feminine
• singular

After proszę o, the thing requested goes into the accusative.
So the adjective describing kopia must also match that case.

Forms of kolejny here:

• kolejna kopia = nominative
• kolejną kopię = accusative

So:

• kolejna kopia = another/next copy as the subject form
• proszę o kolejną kopię = I’m asking for another/next copy

Because kopia is in the accusative singular, not the nominative.

The basic form is:

• kopia = copy

But after proszę o, you need the accusative:

• proszę o kopię

This is a very common feminine noun pattern in Polish:

• nominative: -a
• accusative: -ę

For example:

• książka → książkę
• herbata → herbatę
• kopia → kopię

So kopię is simply the correct case form required by the sentence.

Because dokumentu is in the genitive singular.

In the phrase kopia dokumentu, Polish uses the structure:

copy of a document

Even though English often just says document copy or copy of the document, Polish normally expresses this relationship with the genitive:

• kopia czego? = a copy of what?
• kopia dokumentu = copy of a document / the document

So:

• kopię dokumentu = a copy of the document

This is very common in Polish:

• numer telefonu = phone number
• drzwi pokoju = the room’s door / the door of the room
• koniec dnia = end of the day

It can mean either, depending on context.

kolejny / kolejna / kolejną often means:

• next
• another
• one more
• subsequent

So kolejną kopię dokumentu could be understood as:

• another copy of the document
• one more copy of the document
• the next copy of the document

In many real situations, the most natural English translation would be another copy of the document.

Yes, it is polite and neutral.

Proszę o... is a standard formal or semi-formal way to request something. It works well:

• in offices
• at service counters
• in emails
• in official situations

It is not rude.
If you wanted to sound even more formal, you could say something like:

• Proszę o kolejną kopię dokumentu. Dziękuję.
• Uprzejmie proszę o kolejną kopię dokumentu.

If you wanted a less formal spoken request, you might hear:

• Poproszę kolejną kopię dokumentu.

Yes. That is very natural.

Poproszę is extremely common in spoken Polish when asking for something politely.
It often sounds like:

• I’ll have...
• Could I have...
• I’d like...

So:

• Poproszę kolejną kopię dokumentu. = very natural polite request

Compared with Proszę o kolejną kopię dokumentu:

• Proszę o... can sound a bit more formal or official
• Poproszę... often sounds a bit more conversational

Both are correct.

Here are the main dictionary forms:

• proszę → from prosić = to ask / to request
• o = preposition used here with prosić
• kolejną → from kolejny = next / another / subsequent
• kopię → from kopia = copy
• dokumentu → from dokument = document

So if you are looking words up in a dictionary, those are the forms you would search for.

There are two important case relationships here:

1. proszę o + accusative

   • kolejną kopię
   • This is the thing being requested

2. kopia + genitive

   • dokumentu
   • This shows copy of what

So the sentence breaks down like this:

• Proszę o
  • kolejną kopię (accusative)
• dokumentu (genitive)

This is a good example of how Polish often stacks case patterns inside one sentence.

Yes, but the original order is the most neutral.

Standard order:

• Proszę o kolejną kopię dokumentu.

You might also hear or see variations, depending on emphasis:

• O kolejną kopię dokumentu proszę.
• Kolejną kopię dokumentu proszę.

But these are less neutral and may sound more marked, situational, or conversational.

For a learner, the safest version is:

• Proszę o kolejną kopię dokumentu.

Kopię is pronounced approximately like KOH-pyeh, though the final ę is not exactly the same as English e.

The letter ę is a nasal vowel in Polish, but at the end of a word it is often pronounced less strongly nasally in everyday speech. In careful speech, it still represents a distinct Polish sound.

So:

• kopia = base form
• kopię = accusative form, with the normal feminine ending -ę

This -ę ending is very common, so it is worth getting used to seeing it as a grammatical marker, not just a spelling change.

Polish does not have articles like a and the, so the exact interpretation depends on context.

dokumentu could mean:

• of the document
• of a document

In real use, if both speaker and listener know which document is meant, English would usually translate it as the document:

• Please provide another copy of the document.

If the context is less specific, English might use a document instead.

So the Polish sentence itself does not force the distinction the way English does.