Przed południem chcę odebrać paczkę na poczcie.

It means before noon or in the morning, before 12:00.

• przed = before
• południe = noon / midday
• przed południem is a common time expression

It refers to a time earlier than noon, not just any time in the morning in a vague sense.

Because the preposition przed requires the instrumental case here.

So:

• basic form: południe
• after przed: południem

This is very common in Polish:

• przed obiadem = before lunch
• przed pracą = before work
• przed południem = before noon

So południem is the instrumental form of południe.

Because the verb already tells you the subject.

• chcę = I want

In Polish, subject pronouns are often omitted if the verb ending makes the subject clear.

Compare:

• chcę = I want
• chcesz = you want
• chce = he/she/it wants

You could say Ja chcę odebrać paczkę, but ja is usually added only for emphasis or contrast.

This is the normal Polish pattern: conjugated verb + infinitive.

• chcę = I want
• odebrać = to collect / to pick up

So literally it is I want to pick up.

This is similar to English:

• I want to go
• I want to buy
• I want to collect

In Polish:

• Chcę iść = I want to go
• Chcę kupić = I want to buy
• Chcę odebrać paczkę = I want to pick up a package

Because odebrać is perfective, and odbierać is imperfective.

In this sentence, the speaker means one complete action: picking up the package successfully. That is why odebrać fits better.

• odebrać = to pick up / collect completely, once
• odbierać = to be picking up, to pick up repeatedly, habitually, or in an ongoing sense

After chcę, both aspects are possible, but they mean different things:

• Chcę odebrać paczkę = I want to pick up the package
• Chcę odbierać paczki osobiście = I want to pick up packages in person (regularly / as a habit)

Because paczkę is the accusative case, used for the direct object of the verb.

The noun is:

• nominative: paczka = package / parcel
• accusative: paczkę

Since the package is what the speaker wants to pick up, it becomes the direct object:

• Chcę odebrać paczkę = I want to pick up a package

This is a very common feminine pattern:

• książka → książkę
• kawa → kawę
• paczka → paczkę

Because na poczcie is the normal Polish way to say at the post office.

• na poczcie = at the post office
• na pocztę = to the post office

This is just one of those place expressions that uses na instead of w.

Examples:

• Jestem na poczcie. = I am at the post office.
• Idę na pocztę. = I’m going to the post office.

So in your sentence:

• na poczcie is location: at the post office
• it is in the locative case

It is the locative case.

The basic noun is:

• poczta = post office / mail

After na when talking about location, Polish uses the locative:

• na poczcie = at the post office

Compare:

• na poczta ❌
• na poczcie ✅

A useful contrast:

• na pocztę = to the post office (accusative, movement)
• na poczcie = at the post office (locative, location)

In this sentence, it means at the post office.

The noun poczta can refer to:

• the post office
• the postal system / mail

But here, because of odebrać paczkę na poczcie, the meaning is clearly at the post office.

If you wanted in the mail, the sentence structure would usually be different.

Yes. Polish word order is more flexible than English, because cases show grammatical roles.

The neutral order here is fine:

• Przed południem chcę odebrać paczkę na poczcie.

But you could also say:

• Chcę odebrać paczkę na poczcie przed południem.
• Paczkę chcę odebrać na poczcie przed południem.
• Na poczcie chcę odebrać paczkę przed południem.

These versions are all possible, but the emphasis changes.

For example:

• starting with Przed południem emphasizes the time
• starting with Na poczcie emphasizes the place
• starting with Paczkę emphasizes what is being picked up

Not exactly.

• rano = in the morning
• przed południem = before noon

They often overlap, but they are not identical.

For example:

• rano is a general part of the day
• przed południem is more specifically about being earlier than noon

So przed południem can sound a bit more precise.

They are not the same.

• odebrać paczkę = to pick up / collect a package
• dostać paczkę = to receive a package

So:

• odebrać focuses on the action of going and getting it
• dostać focuses on the fact that it comes to you or you receive it

In your sentence, the speaker wants to physically collect the parcel, so odebrać is the right choice.

A rough English-style guide would be:

Pshed pow-WOOD-nyem htsen ઓ-de-BRATCH PATCH-keng na POCH-chyeh

A few important pronunciation points:

• przed sounds roughly like pshed
• chcę is tricky; ch is like a hard h, and ę is nasal
• odebrać ends with -ać, pronounced roughly -atch
• paczkę has cz like ch in chop
• poczcie contains czc, which is a difficult consonant cluster
• ę and ie should not be pronounced exactly like English vowels

A more Polish-like breakdown:

• Przed południem → pshet po-WOOD-nyem
• chcę odebrać → h-tsen o-de-BRACH
• paczkę na poczcie → PATCH-keng na POCH-chtye

If you want, I can also break the whole sentence down syllable by syllable.