Nadawca chce nadać przesyłkę, a kurier chce doręczyć ją jutro.

• nadawca = sender
• przesyłka = shipment / parcel / package
• kurier = courier

In the sentence, przesyłkę is the form of przesyłka used because it is the direct object of nadać.

So the sentence is about:

• the sender wanting to send a parcel
• the courier wanting to deliver it tomorrow

Because przesyłka is a feminine noun, and here it is in the accusative case as the direct object of nadać.

• nominative: przesyłka = the parcel
• accusative: przesyłkę = the parcel as the thing being sent

This is very common in Polish: the form of the noun changes depending on its role in the sentence.

Because ją is the accusative form of the pronoun ona.

• ona = she / it in the nominative
• ją = her / it in the accusative

Here ją refers back to przesyłkę, which is feminine:

• kurier chce doręczyć ją jutro = the courier wants to deliver it tomorrow

So ją means it, but grammatically it matches the feminine noun przesyłka.

Because chcieć (to want) is followed by an infinitive.

So:

• chce nadać = wants to send
• chce doręczyć = wants to deliver

This works much like English:

• I want to go
• He wants to send
• She wants to deliver

In Polish:

• chcę iść
• chce nadać
• chce doręczyć

These are more specific, somewhat formal/logistics-related verbs.

• nadać przesyłkę = to send/post/dispatch a parcel
  This is often used for officially sending something through a postal or delivery system.
• doręczyć przesyłkę = to deliver a parcel
  This emphasizes successful delivery to the recipient.

Possible alternatives:

• wysłać also means to send, but nadać is especially common for parcels, letters, and shipments.
• dostarczyć means to deliver/supply, but doręczyć is especially common for mail, documents, or parcels being handed over.

So the sentence sounds natural in a shipping/courier context.

Yes, both are perfective.

• nadać = to send off / dispatch successfully
• doręczyć = to deliver successfully

Perfective verbs in Polish often focus on a completed whole action rather than the ongoing process.

That fits well here, because:

• the sender wants to send the parcel off
• the courier wants to deliver it

If you wanted to talk more about the process or general activity, you might use imperfective verbs instead:

• nadawać
• doręczać

But in this sentence, the completed-result idea is natural.

In this sentence, a connects two related clauses while also giving a slight sense of contrast or change of subject.

• Nadawca chce nadać przesyłkę, a kurier chce doręczyć ją jutro.

This feels like:

• The sender wants to send the parcel, and/as for the courier, he wants to deliver it tomorrow.

If you used i, it would sound more like a simple addition:

• X and Y

Polish a is very common when:

• the subject changes
• you compare two people or actions
• there is a mild contrast, even if not strong

So a is very natural here.

Yes, Polish word order is flexible, but some versions sound more natural than others.

The given version:

• kurier chce doręczyć ją jutro

is understandable, but many speakers would more naturally say:

• kurier chce ją doręczyć jutro or simply
• kurier chce doręczyć ją jutro, depending on emphasis

In Polish, short pronouns like ją often appear before the infinitive or in other unstressed positions, but placement can vary.

For a learner, the important thing is:

• ją = it
• it refers to przesyłkę
• the sentence is correct and understandable

Yes, jutro can move. Polish word order is more flexible than English, and moving jutro changes emphasis more than basic meaning.

Examples:

• Kurier chce doręczyć ją jutro.
• Kurier jutro chce doręczyć ją.
• Jutro kurier chce doręczyć ją.

All of these point to tomorrow as the time of delivery, but the most natural choice depends on style and emphasis.

Placing jutro at the end is very normal and neutral.

Because both subjects are third person singular:

• nadawca = the sender → he/she/the sender wants
• kurier = the courier → he wants

The verb chcieć conjugates like this in the present tense:

• chcę = I want
• chcesz = you want
• chce = he/she/it wants
• chcemy = we want
• chcecie = you (plural) want
• chcą = they want

So both clauses use chce because both subjects are singular.

They are close in meaning, but there is a usage difference.

• nadać przesyłkę often means to hand a parcel over for shipment through a postal/courier system
• wysłać przesyłkę is a broader, more general to send a parcel

In many contexts they can overlap, but:

• nadać sounds especially natural in post-office/courier language
• wysłać is more general everyday vocabulary

So this sentence sounds like standard logistics or delivery language.

Grammatically, nadawca is a masculine noun, even though it ends in -a, which often looks feminine to learners.

This type of noun is common for words referring to people:

• mężczyzna = man
• kolega = male friend/colleague
• kierowca = driver
• nadawca = sender

A female sender can still sometimes be referred to with role nouns depending on context, but if you want an explicitly feminine form, Polish may use forms like nadawczyni in some contexts, though nadawca is very standard in official/logistics language.

A rough pronunciation guide is:

Nadawca chce nadać przesyłkę, a kurier chce doręczyć ją jutro.

Approximate English-style guide:

na-DAV-tsa htshe NA-dach pshe-SWIW-ke, a KOO-ryer htshe do-REN-chich yow YOO-tro

A few useful sounds:

• cz in chce sounds like English ch, but harder
• ć in nadać and doręczyć is a soft ch sound
• rz / ż sounds like the s in measure
• ą is a nasal vowel, though in real speech it often changes depending on the following sound

You do not need perfect pronunciation immediately; the biggest goal is recognizing:

• chce
• nadać
• przesyłkę
• doręczyć
• jutro