Μπορείς να το πεις άλλη μια φορά; Δεν θέλω να το επαναλάβεις πολύ γρήγορα.

In Modern Greek, να is normally used before a verb in this kind of structure.

• μπορείς = you can
• να πεις = to say / say in a subordinate clause

So Μπορείς να το πεις; literally works like Can you say it?

Without να, the sentence would be ungrammatical in standard Modern Greek.

Because after μπορείς να, Greek usually uses a form from the perfective verb stem, not the ordinary present form.

Here are the relevant forms:

• λέω = I say / I am saying
• να λες = to be saying / to say repeatedly or generally
• να πεις = to say, once / in a complete act

In Μπορείς να το πεις άλλη μια φορά;, the speaker is asking for one complete repetition, so να το πεις is the natural choice.

το means it.

Greek object pronouns often come before the verb:

• το πεις = say it
• το επαναλάβεις = repeat it

So even though English says say it, Greek says it say in word order.

That is the normal position for weak object pronouns in Greek.

Compare:

• Το βλέπω = I see it
• Το ξέρω = I know it
• Μπορείς να το πεις; = Can you say it?

So for an English speaker, this is one of the basic word-order differences to get used to: object pronouns usually appear before the verb in Greek.

άλλη μια φορά literally means another one time, i.e. one more time / again.

• άλλη = another
• μια = one, a
• φορά = time / occasion

So:

• Πες το άλλη μια φορά. = Say it one more time.

You could also use ξανά, which means again:

• Μπορείς να το πεις ξανά; = Can you say it again?

The version with άλλη μια φορά can sound a little more specific: one more time.

Both spellings are seen, but μια is the very common modern spelling in everyday Greek.

• μία is a more conservative spelling
• μια is standard and very common in modern usage

Both mean one / a in the feminine form, and here it agrees with φορά, which is feminine.

Nouns in Greek have grammatical gender. φορά is a feminine noun, so the words that go with it also appear in feminine forms:

• άλλη = feminine form of other/another
• μια = feminine form of one/a
• φορά = feminine noun

That is why you get άλλη μια φορά.

Because επαναλαμβάνω means repeat, which is a very natural verb here.

• Δεν θέλω να το επαναλάβεις πολύ γρήγορα.
• literally: I don’t want you to repeat it very quickly.

Greek could use other phrasing, but επαναλάβεις is clear and natural when you mean say the same thing again.

This is the same perfective vs. imperfective contrast as with πεις.

• να επαναλάβεις = to repeat it once, as a complete action
• να επαναλαμβάνεις = to keep repeating it / repeat it habitually

Here the speaker means one repetition, so να το επαναλάβεις is the natural choice.

Because Greek can use this structure:

• θέλω να + verb

and the subject of the second verb is understood from context.

Here:

• θέλω = I want
• να το επαναλάβεις = for you to repeat it

Since επαναλάβεις is the 2nd person singular form, it clearly means you repeat it, not I repeat it.

If the speaker meant I don’t want to repeat it, it would be:

• Δεν θέλω να το επαναλάβω.

So the ending of the verb tells you who is doing the action.

It means too quickly / very quickly, depending on context.

• πολύ = very / much / too
• γρήγορα = quickly

In this sentence, the natural English meaning is too quickly, because the speaker is asking someone not to say it so fast.

So:

• Δεν θέλω να το επαναλάβεις πολύ γρήγορα.
• natural English: I don’t want you to repeat it too quickly.

Yes. Greek often expresses this idea more directly with slowly:

• Μπορείς να το πεις άλλη μια φορά, πιο αργά;
• Can you say it one more time, more slowly?

That may sound even more natural in many real situations.

Compare:

• Μην το λες τόσο γρήγορα. = Don’t say it so fast.
• Πες το πιο αργά. = Say it more slowly.

It is understandable, but in everyday conversation a Greek speaker might often use something a bit softer or more direct, such as:

• Μπορείς να μην το επαναλάβεις τόσο γρήγορα;
  Could you not repeat it so quickly?

• Μπορείς να το πεις πιο αργά;
  Can you say it more slowly?

• Πες το λίγο πιο αργά, παρακαλώ.
  Say it a little more slowly, please.

So Δεν θέλω να το επαναλάβεις πολύ γρήγορα is grammatical, but depending on tone and context, other versions may sound more natural in casual speech.

The main verbs are in the present tense:

• Μπορείς = present, you can
• θέλω = present, I want

But the verbs after να are not best thought of as normal English-style tense forms. In learner terms, they are part of a subjunctive-type construction:

• να το πεις
• να το επαναλάβεις

These forms here express a single complete action, not past time.

A rough English-style guide would be:

bo-REES na to PEES AL-ee mia fo-RA? then THE-lo na to e-pa-na-LA-vees po-LEE GRI-go-ra

A few notes:

• ει in μπορείς and πεις sounds like ee
• δεν before a voiced sound can sound a bit like then to English ears
• γρήγορα has a voiced Greek γ sound that does not match English exactly

The main stress points are:

• μπορείς
• πεις
• άλλη
• φορά
• θέλω
• επαναλάβεις
• πολύ
• γρήγορα

It is not rude, but it is fairly direct because it uses μπορείς and θέλω with you singular.

For more politeness, you could say:

• Μπορείτε να το πείτε άλλη μια φορά;
  Can you say it one more time?
  This uses the plural/formal you.

• Παρακαλώ, πείτε το πιο αργά.
  Please say it more slowly.

So the original sentence is fine for informal conversation with one person, but you may want μπορείτε / πείτε in more formal situations.

You would use the plural/formal verb forms:

• Μπορείτε να το πείτε άλλη μια φορά;
• Δεν θέλω να το επαναλάβετε πολύ γρήγορα.

Changes:

• μπορείς → μπορείτε
• πεις → πείτε
• επαναλάβεις → επαναλάβετε

Greek uses these plural forms both for more than one person and for polite/formal singular you.