Αύριο θα ανανεώσω την κάρτα μου, προτού πάω ξανά στο γκισέ.

In Greek, the future is usually formed with θα + verb form.

Here, ανανεώσω is the perfective non-past form of ανανεώνω. That form is used for a single, complete action:

• θα ανανεώσω = I will renew
• not I will be renewing or I renew regularly

Because renewing a card is seen as one complete event, θα ανανεώσω is the natural choice.

This is about aspect, which is very important in Greek.

• ανανεώσω = perfective → one complete action
• ανανεώνω = imperfective → ongoing, repeated, habitual action

So:

• θα ανανεώσω την κάρτα μου = I will renew my card once
• θα ανανεώνω την κάρτα μου would sound more like I will be renewing my card repeatedly or as an ongoing process, which does not fit this situation well

Greek often makes this distinction where English does not.

Because κάρτα is the direct object of the verb ανανεώσω.

The noun κάρτα is feminine singular, so its article changes depending on case:

• nominative: η κάρτα = the card
• accusative: την κάρτα = the card as the object

Since the speaker is renewing the card, Greek uses the accusative:

• ανανεώνω την κάρτα

So την shows that κάρτα is receiving the action.

In Greek, possessive words like μου often come after the noun:

• η κάρτα μου = my card
• το σπίτι μου = my house
• ο φίλος μου = my friend

So την κάρτα μου literally looks like the card my, but it simply means my card.

This is the normal Greek pattern.

English uses an infinitive: to renew.

Modern Greek does not use the infinitive the way English does. Instead, it uses finite verb forms.

So where English says:

• I will renew

Greek says:

• θα ανανεώσω

There is no separate equivalent of the English infinitive to renew here.

After προτού meaning before, Greek does not normally use θα.

Instead, it uses a subjunctive-type form of the verb:

• προτού πάω = before I go

So the pattern is:

• main clause: θα ανανεώσω
• subordinate clause after προτού: πάω

This is very common in Greek: after words like πριν, προτού, and certain other conjunctions, you do not use θα even if English uses a future idea.

Again, this is mostly about aspect.

• πάω here is the perfective form, meaning go once / make a single trip
• πηγαίνω is the imperfective form, more like go / be going / go regularly

In this sentence, the speaker means one specific action:

• before I go again to the counter

So πάω is the right choice.

ξανά means again.

Here it modifies πάω:

• πάω ξανά στο γκισέ = I go again to the counter

It tells us that this is not the first visit to the counter.

Greek can also express this idea with ξανα- attached to the verb in many contexts, for example να ξαναπάω, but the separate word ξανά is also completely normal.

στο is a contraction of:

• σε + το = στο

So:

• στο γκισέ = to / at the counter

γκισέ is a loanword meaning something like service counter, window, or desk, depending on context.

It is treated here as a neuter noun:

• το γκισέ
• στο γκισέ

Yes. That would be very natural.

Both can mean before I go again to the counter:

• προτού πάω...
• πριν πάω...
• πριν να πάω... is also possible

Very roughly:

• πριν is extremely common in everyday Greek
• προτού can sound a bit more formal or literary, though it is still perfectly normal

So the original sentence is correct, but πριν is a common alternative a learner will hear often.

Greek word order is flexible, and time expressions often come first.

Putting Αύριο first does two things:

• it sets the time immediately
• it sounds natural and organized

So:

• Αύριο θα ανανεώσω την κάρτα μου...

means the same as other possible orders, but starting with Αύριο is very common when the speaker wants to frame the whole sentence in time first.

The comma separates the main clause from the subordinate clause:

• Αύριο θα ανανεώσω την κάρτα μου
• προτού πάω ξανά στο γκισέ

In Greek, a comma is commonly used before a following time clause like this, especially when it comes after the main statement. It helps mark the pause and structure of the sentence.

So the comma is not surprising here, and it makes the sentence easier to read.