Holnap átveszem a küldeményt.

Hungarian very often uses the present tense for a future action when the time is already clear from the sentence.

Here, holnap means tomorrow, so the future meaning is obvious:

• Holnap átveszem a küldeményt. = I’ll receive / collect the shipment tomorrow.

So Hungarian does not need a separate future form here.

You could also make the future more explicit with fogok:

• Holnap át fogom venni a küldeményt.

But in everyday Hungarian, the simple present is usually more natural in a sentence like this.

Because Hungarian usually leaves out the subject pronoun when it is already clear from the verb ending.

• átveszem already means I receive / I will receive
• the ending -em shows 1st person singular: I

So én is not necessary.

You could say:

• Én holnap átveszem a küldeményt.

But that sounds more emphatic, like I will collect it tomorrow.

This is because Hungarian has two kinds of verb conjugation:

• indefinite conjugation
• definite conjugation

Here the object is definite:

• a küldeményt = the shipment / the parcel

Because the object is definite, the verb takes the definite form:

• átveszem = I receive/collect it
• compare with átveszek = I receive/take over something (non-specific or indefinite)

So:

• Átveszek egy küldeményt. = I’m receiving a shipment / a parcel.
• Átveszem a küldeményt. = I’m receiving the shipment / the parcel.

It has three main parts:

• át- = a verbal prefix
• vesz = from venni
• -em = I in the definite conjugation

The base verb venni most commonly means to take or to buy, but with the prefix át-, it becomes átvenni, which means things like:

• to take over
• to receive
• to accept
• to collect

So in this sentence, átveszem is best understood as I will receive / collect it.

In átvenni, the prefix át- changes the meaning of the basic verb venni.

• venni = to take / to buy
• átvenni = to take over / receive / collect

In practical contexts like mail, parcels, or official documents, átvenni often means:

• to receive
• to pick up
• to collect
• to take delivery of

So átveszem a küldeményt is something like:

• I will take delivery of the shipment
• I’ll collect the parcel
• I’ll receive the item

depending on context.

Because it is the direct object of the verb, and Hungarian marks direct objects with the accusative ending -t.

• base form: küldemény = shipment / mail item / parcel
• object form: küldeményt

So:

• a küldemény = the shipment
• a küldeményt = the shipment as the thing being received

English usually does not change the noun form here, but Hungarian does.

Not exactly.

küldemény is a fairly general and somewhat formal word meaning:

• shipment
• consignment
• postal item
• mail item

It can refer to different kinds of sent items.

csomag is more specifically:

• package
• parcel

So küldemény is broader and often used in postal, delivery, or official language.

Depending on context, Holnap átveszem a küldeményt could be translated as:

• I’ll collect the parcel tomorrow.
• I’ll receive the shipment tomorrow.
• I’ll pick up the delivery tomorrow.

Because Hungarian uses definite articles much like English uses the.

• a is the definite article before most consonant-initial words
• az is used before vowel-initial words

So:

• a küldeményt = the shipment

This also matters grammatically, because a definite object triggers the definite verb conjugation, which is why the verb is átveszem.

Yes. Hungarian word order is flexible, but different orders give different emphasis.

The sentence you have:

• Holnap átveszem a küldeményt.

This is a natural way to say:

• Tomorrow I’ll collect the shipment.

Other possible orders:

• Átveszem a küldeményt holnap.
  Also possible, but less neutral in many contexts.

• A küldeményt holnap átveszem.
  Puts more topic emphasis on the shipment.

• Holnap veszem át a küldeményt.
  This is especially interesting: the prefix separates from the verb, and the sentence gives stronger focus to holnap — roughly It’s tomorrow that I’ll collect the shipment.

So yes, word order can change, but it is not random: it affects emphasis and information structure.

In Hungarian, verbal prefixes often:

• stay attached in a neutral sentence
• separate when there is strong focus, negation, or certain other structures

Neutral:

• Holnap átveszem a küldeményt.

Focused time expression:

• Holnap veszem át a küldeményt.

Negation:

• Nem veszem át a küldeményt. = I’m not receiving/collecting the shipment.

So the attached form átveszem is the normal neutral version, while veszem át appears in special sentence structures.

holnap is already an adverb meaning tomorrow, so it does not need any extra ending here.

It simply tells you when the action happens:

• Holnap átveszem a küldeményt.

Unlike some time expressions in Hungarian, holnap commonly appears without any extra suffix in this kind of sentence.

A rough pronunciation guide:

• Holnap ≈ HOL-nawp
• átveszem ≈ AAT-veh-sem
• a = a short aw
• küldeményt ≈ KUEL-deh-maynyt

A few important sounds:

• á is a long vowel, like a longer open a
• e in Hungarian is usually more like eh
• sz is pronounced like English s
• s by itself is pronounced like English sh
• ny sounds like the ny in canyon
• ü is a front rounded vowel, with no exact English equivalent

So in átveszem, the sz sounds like s, not z:

• á-tve-sem

And in küldeményt, the ny is one sound, not n + y separately.

It is neutral and perfectly natural in both spoken and written Hungarian.

What affects the tone more is the noun küldemény, which sounds a bit more official or logistical than everyday csomag.

So:

• Holnap átveszem a küldeményt. = neutral, slightly official because of küldemény
• Holnap átveszem a csomagot. = more everyday, specifically the package/parcel

Both are normal.