Wieczorem wyniosę worek, jeśli znajdę wolne miejsce w śmietniku.

Wieczorem is the normal Polish way to say in the evening.

It comes from wieczór and is used as a fixed adverbial time expression. In Polish, parts of the day are often expressed this way rather than with a preposition.

So:

• wieczorem = in the evening
• rano = in the morning
• nocą = at night

W wieczór would usually not be the natural choice here.

Polish usually leaves out subject pronouns when they are not needed.

The verb wyniosę already tells you the subject is I because the ending -ę marks 1st person singular.

So:

• wyniosę = I will take out
• ja wyniosę = I will take out, but with extra emphasis or contrast

Using ja is possible, but it would sound more emphatic, like I will take it out, not someone else.

Wyniosę is the future meaning here.

The verb wynieść is perfective, and perfective Polish verbs do not normally have a true present tense. Their present-looking forms refer to the future.

So:

• wyniosę = I will take out
• wynoszę = I am taking out / I take out regularly

In this sentence, we are talking about one completed action in the future, so wyniosę is the right form.

Because będę wynosić is the imperfective future, and it focuses more on the process, repetition, or duration of the action.

Compare:

• wyniosę worek = I’ll take the bag out once, as a completed action
• będę wynosić worek = I’ll be taking the bag out / I’ll take bags out repeatedly / the action is viewed as ongoing

Here the speaker means a single practical result: the bag will end up outside. So wyniosę sounds more natural.

Not literally.

Wynieść means to carry/take something out, usually from inside to outside. So wyniosę worek literally means I’ll take the bag out.

Because the sentence mentions śmietnik, we understand it is probably a trash bag, so in natural English the idea may be close to I’ll take the trash out. But the Polish verb itself does not directly mean throw away.

For throw away, Polish would more directly use verbs like wyrzucić.

Because worek is the direct object of wyniosę, so it is in the accusative case.

For a masculine inanimate noun like worek, the accusative singular is the same as the nominative singular:

• nominative: worek
• accusative: worek

So the form does not change.

If it were a masculine animate noun, you would often see a different accusative form.

After jeśli meaning if, Polish often uses a perfective non-past form to talk about a future condition.

So:

• jeśli znajdę = if I find

This is very normal Polish.

The verb znaleźć is perfective, so znajdę has a future meaning here. It does not mean if I am finding.

In a way, this is a bit like English, where we also say:

• If I find space, I’ll take the bag out

  not

• If I will find space...

Znajdę refers to successfully finding something once.

Będę znajdować is imperfective and would suggest an ongoing or repeated activity of finding, which does not fit this sentence well.

Here the meaning is:

• first, maybe I locate some free space
• then, I take the bag out

That is a single completed result, so znajdę is the natural choice.

Wolne miejsce is the direct object of znajdę, so it is in the accusative singular.

But because miejsce is a neuter noun, its nominative and accusative singular look the same:

• nominative: wolne miejsce
• accusative: wolne miejsce

The adjective wolne agrees with miejsce in gender, number, and case.

Also, wolne miejsce literally means free place/space, and in English we would usually say free space or room.

Because w śmietniku means in the trash bin / inside the dumpster, which matches find free space.

The sentence is about finding room inside it.

• w śmietniku = in the bin, inside it
• do śmietnika = to the bin / into the bin

So:

• znajdę wolne miejsce w śmietniku = I find free space in the bin
• wyniosę worek do śmietnika = I take the bag to the bin

Both can be correct in different sentences, but they mean different things.

It is the locative singular.

The preposition w means in here, and when it expresses location, it takes the locative case.

So:

• base form: śmietnik
• locative: w śmietniku

This is why the ending changes to -u.

Because jeśli introduces a subordinate clause, and in Polish that clause is normally separated with a comma.

So the structure is:

• main clause: Wieczorem wyniosę worek
• subordinate clause: jeśli znajdę wolne miejsce w śmietniku

Polish punctuation is stricter than English here, so the comma is expected.

Yes. Polish word order is flexible, and changing it usually changes emphasis rather than basic meaning.

For example:

• Wieczorem wyniosę worek, jeśli znajdę wolne miejsce w śmietniku.
• Wyniosę worek wieczorem, jeśli znajdę wolne miejsce w śmietniku.
• Jeśli znajdę wolne miejsce w śmietniku, wieczorem wyniosę worek.

All of these are possible.

The original sentence sounds natural and starts with wieczorem to foreground the time.

Either is possible, depending on context.

Polish has no articles, so worek can mean:

• a bag
• the bag

The listener figures it out from the situation. In this sentence, it probably means something like the trash bag or the bag of rubbish that both speaker and listener already know about.

If you wanted to be more explicit, you could say something like worek na śmieci.