Dowiem się, czy przedłużenie jest możliwe.

Dowiem się means I will find out / I will learn.

It comes from the verb dowiedzieć się, which means to come to know something, not simply to know it.

So:

• dowiem się = I will find out
• będę wiedzieć = I will know

That’s why Dowiem się, czy przedłużenie jest możliwe means I’ll find out whether an extension is possible, not I’ll know whether... in the plain sense.

The verb is dowiedzieć się, not just dowiedzieć. So się is part of the verb.

Many Polish verbs include się, and in some cases it works a bit like a reflexive marker, but with dowiedzieć się, you should learn the whole expression as one unit:

• dowiedzieć się = to find out
• dowiem się = I will find out

In this sentence, się is not optional.

It is a future form.

More specifically, it is the 1st person singular future of the perfective verb dowiedzieć się.

That means:

• dowiem się = I will find out
• it refers to a single completed result in the future

Polish perfective verbs do not have a normal present meaning. Their present-looking forms often express the future. So although dowiem may look present-like in form, its meaning here is future.

The basic verb in the sentence is dowiedzieć się.

Its aspect pair is:

• dowiadywać się — imperfective
• dowiedzieć się — perfective

Very roughly:

• dowiadywać się = to be finding out / to find out repeatedly / to be in the process of learning
• dowiedzieć się = to find out as a completed event

In this sentence, the speaker means one future result: I’ll find out. That is why Polish uses the perfective verb: dowiem się.

Here, czy means whether / if in an indirect yes-no question.

So:

• czy przedłużenie jest możliwe = whether an extension is possible

It does not mean or here.

Compare:

• Nie wiem, czy on przyjdzie. = I don’t know whether he will come.
• Dowiem się, czy przedłużenie jest możliwe. = I’ll find out whether an extension is possible.

A useful rule: after verbs like know, ask, check, find out, Polish often uses czy to introduce whether/if clauses.

Because czy introduces an indirect question, while jeśli usually means if in the sense of on condition that.

Here the meaning is:

• I’ll find out whether an extension is possible

That is an indirect question, so czy is the natural word.

Compare:

• Sprawdzę, czy to działa. = I’ll check whether it works.
• Jeśli to działa, kupię to. = If it works, I’ll buy it.

So in your sentence, czy is correct.

Przedłużenie means extension, renewal, or sometimes prolongation, depending on context.

It is a noun, and it is:

• neuter
• singular
• here in the nominative case

In this sentence, it is the subject of the clause:

• przedłużenie jest możliwe = the extension is possible

You may see this word in contexts like extending:

• a deadline
• a contract
• a stay
• a subscription
• a visa or permit

The exact English translation depends on context.

Because możliwe has to agree with przedłużenie.

The noun przedłużenie is neuter, so the adjective must also be neuter singular:

• masculine: możliwy
• feminine: możliwa
• neuter: możliwe

So:

• przedłużenie jest możliwe = the extension is possible

This is standard adjective agreement in Polish.

Jest możliwe means is possible, and in this sentence that sounds natural because the speaker wants to find out about the current/general possibility of an extension.

So the sentence means:

• I’ll find out whether an extension is possible

You could say będzie możliwe in some contexts, but that would shift the meaning toward future possibility:

• czy przedłużenie będzie możliwe = whether an extension will be possible

So:

• jest możliwe = possible now / in general
• będzie możliwe = possible in the future

The original sentence is asking about the present state of possibility, even though the act of finding out happens later.

In Polish, subordinate clauses are normally separated by a comma.

Here:

• Dowiem się = main clause
• czy przedłużenie jest możliwe = subordinate clause

So the comma is required:

• Dowiem się, czy przedłużenie jest możliwe.

This is one difference from English, where punctuation may feel less strict in similar sentences.

Yes, Polish word order is fairly flexible, though some orders sound more neutral than others.

The most neutral version is:

• Dowiem się, czy przedłużenie jest możliwe.

But other orders may be possible depending on emphasis, for example:

• Czy przedłużenie jest możliwe, dowiem się.
  This is much less neutral and sounds marked or literary.

In ordinary speech and writing, the original order is the best choice.

A rough pronunciation guide is:

• dowiem ≈ DOH-vyem
• się ≈ shyeng or sheh̃ (the exact nasal sound is hard to represent in English)

A few helpful points:

• w in Polish sounds like English v
• się is pronounced with a soft ś sound, similar to a soft sh
• the stress in Polish is usually on the second-to-last syllable, so:
  • DO-wiem
  • przedłu-ŻE-nie
  • moż-LI-we

You do not need to pronounce się exactly like an English sound; it is enough at first to aim for a soft sh + a nasal vowel.

Yes, in many real situations that is a very natural translation.

Literally, Dowiem się is I’ll find out, but depending on context, idiomatic English might be:

• I’ll find out whether an extension is possible.
• I’ll check if an extension is possible.
• I’ll see whether an extension is possible.

The Polish sentence itself still centers on obtaining the information, not directly on the act of checking. But in conversation, those English versions can all fit well.