Μετά την άφιξη θα πάρω το λεωφορείο για το κέντρο.

Because μετά is followed by the accusative case in Modern Greek when it means after.

The dictionary form is η άφιξη = arrival.
But after μετά, it becomes:

• μετά την άφιξη = after the arrival

So την is the feminine singular accusative form of the article, matching άφιξη.

Greek uses the definite article much more often than English does. After many prepositions, a noun will normally appear with its article.

So:

• μετά την άφιξη is natural Greek
• μετά άφιξη is not correct

Even when English drops the, Greek often keeps it.

Because θα πάρω expresses a single, complete action in the future: one act of taking the bus.

• θα πάρω το λεωφορείο = I will take the bus
• θα παίρνω το λεωφορείο would suggest something more like I will be taking / I will take regularly / I will keep taking

So in this sentence, θα πάρω is the natural choice because it refers to one specific future action.

Yes. πάρω comes from the verb παίρνω = to take.

Greek verbs often use different stems depending on aspect. Here:

• παίρνω = imperfective/basic form
• πάρω = perfective form used in structures like θα πάρω

So θα πάρω is not a different verb; it is the future form built from the same verb, but with the perfective stem.

After παίρνω, the thing you take is a direct object, so no preposition is needed.

• παίρνω το λεωφορείο = I take the bus
• μπαίνω στο λεωφορείο = I get on the bus
• είμαι στο λεωφορείο = I am on the bus

So το λεωφορείο is simply the object of πάρω.

Here για shows the destination or intended direction: for / to the center.

So:

• το λεωφορείο για το κέντρο = the bus for the center / the bus to downtown

This is very natural when talking about transport. It often means the bus whose route goes there.

If you said στο κέντρο, that would usually point more directly to being in the center or going into the center in a different structure. In this sentence, για το κέντρο fits well with which bus you are taking.

Not necessarily. The sentence can leave it implicit if the context already makes it clear whose arrival is meant.

So:

• Μετά την άφιξη θα πάρω το λεωφορείο... = After the arrival, I’ll take the bus...
• Μετά την άφιξή μου θα πάρω το λεωφορείο... = After my arrival, I’ll take the bus...

If you want to be more explicit, especially in isolation, adding μου is very natural.

Greek word order is fairly flexible. The original sentence starts with the time phrase to set the scene:

• Μετά την άφιξη θα πάρω το λεωφορείο για το κέντρο.

But other orders are possible, for example:

• Θα πάρω το λεωφορείο για το κέντρο μετά την άφιξη.

The meaning stays basically the same, but the emphasis changes a bit. Putting Μετά την άφιξη first highlights the time frame.

It is natural, but it can sound a little more formal or written than everyday speech.

In casual conversation, if you mean after I arrive, many speakers might prefer something like:

• Όταν φτάσω, θα πάρω το λεωφορείο για το κέντρο.

That said, Μετά την άφιξη is completely correct and sounds especially natural in travel, announcements, instructions, or more formal contexts.

A helpful pronunciation guide is:

Me-TA tin A-fi-xi tha PA-ro to le-o-fo-REE-o ya to KEN-tro

The stressed syllables are marked by the written accents:

• Μετά
• άφιξη
• πάρω
• λεωφορείο
• κέντρο

A few notes:

• θ sounds like the th in think
• για sounds like ya
• χ in άφιξη is the rough Greek sound, not like English x
• λεωφορείο has many vowels, but Greek speakers pronounce them smoothly: le-o-fo-REE-o

Yes. After για, the noun is in the accusative, and κέντρο is a neuter noun.

The article is:

• nominative: το κέντρο
• accusative: το κέντρο

For many neuter nouns, nominative and accusative look the same. So even though it is accusative after για, the form does not change visibly.