Na szczęście w torbie leży oryginał i jedna kopia.

Na szczęście is a fixed expression meaning fortunately or luckily.

Even though na often means on, you should treat na szczęście as one whole phrase. It is not understood word-for-word in normal speech.

So:

• Na szczęście = Fortunately / Luckily

Because w means in here, and when Polish uses w for a static location, the noun usually goes into the locative case.

The base form is:

• torba = bag

After w for location:

• w torbie = in the bag

So the ending changes because of case:

• torba → torbie

Polish often prefers a verb that describes an object's position.

• leżeć = to lie, to be lying
• stać = to stand
• wisieć = to hang

So w torbie leży oryginał sounds more physical and natural than just saying jest. It suggests the document is lying in the bag.

Using jest would not be impossible in some contexts, but leży is more vivid and idiomatic for an object resting somewhere.

Leży is the:

• 3rd person singular
• present tense
• of the verb leżeć = to lie

So:

• leży = lies / is lying

Examples:

• Książka leży na stole. = The book is lying on the table.
• Telefon leży w torbie. = The phone is in the bag / lying in the bag.

This is a very common learner question.

Strictly speaking, a compound subject like oryginał i jedna kopia often takes a plural verb:

• Oryginał i jedna kopia leżą w torbie.

That is also correct.

But in Polish, when the subject comes after the verb, speakers often use a singular verb, especially in descriptive sentences where they are introducing what is there. In that pattern, the verb may agree with the first noun or stay singular in a more presentational style:

• W torbie leży oryginał i jedna kopia.

So this sentence is natural.
For a learner, the safest rule is:

• if the subject is clearly a plural combination before the verb, use plural
• after the verb, singular like this is also common and natural

Because jedna kopia is part of the subject, not the object.

The subject normally appears in the nominative case:

• jedna kopia = nominative

If it were a direct object, you would often see the accusative:

• mam jedną kopię = I have one copy

Here, the sentence is saying what is in the bag, so oryginał and jedna kopia are the things doing the lying in the bag, which makes them subject-like.

Yes, Polish has no articles like a or the.

That means kopia by itself could mean:

• a copy
• the copy

depending on context.

Adding jedna makes the number explicit:

• jedna kopia = one copy

So here jedna does real work: it emphasizes that there is exactly one copy.

Because the speaker chose to specify the number only for kopia.

• oryginał can simply mean the original / an original
• jedna kopia stresses one copy

You could say:

• jeden oryginał i jedna kopia

But that sounds more like an explicit inventory or count. The original sentence is more natural and lighter.

Also, jedna is feminine because kopia is feminine. If you did use jeden with oryginał, it would be:

• jeden oryginał — because oryginał is masculine

Yes. Polish word order is flexible, and changing it usually changes focus or emphasis, not the core meaning.

For example:

• Na szczęście w torbie leży oryginał i jedna kopia.
• Na szczęście oryginał i jedna kopia leżą w torbie.
• W torbie leży na szczęście oryginał i jedna kopia.

These all mean roughly the same thing, but they spotlight different parts of the sentence.

The original version sounds like:

1. Fortunately...
2. in the bag...
3. there is / lies...
4. the original and one copy

So it has a natural, scene-setting feel.

Yes.

• oryginał is masculine
• kopia is feminine

This matters because adjectives, numerals, and some verb forms agree with the noun's gender.

That is why you get:

• jeden oryginał
• jedna kopia

Even though the present-tense verb leży does not show gender clearly here, gender still matters elsewhere in the sentence and in related forms.

A rough guide:

• na szczęście ≈ nah SHCHEN-shcheh
• leży ≈ LEH-zhih
• oryginał ≈ oh-rih-GHIH-now

A few useful notes:

• szcz sounds like a compressed shch
• ż sounds like the s in measure
• ł is pronounced like English w
• Polish stress is usually on the next-to-last syllable

So:

• szCZĘ-ście
• LE-ży
• orygiNAŁ

The hardest part for English speakers is usually szczęście, so it is completely normal if that one takes practice.