Μην ξεχάσεις την απόδειξη, σε περίπτωση που χρειαστεί επιστροφή.

Don’t forget the receipt, in case a return is needed.

Breakdown of Μην ξεχάσεις την απόδειξη, σε περίπτωση που χρειαστεί επιστροφή.

• ξεχνάω: to forget
• χρειάζομαι: to be needed
• η επιστροφή: the return
• η απόδειξη: the receipt
• σε περίπτωση που: in case
• μην: not (don’t)

Questions & Answers about Μην ξεχάσεις την απόδειξη, σε περίπτωση που χρειαστεί επιστροφή.

Why does the sentence use Μην instead of Δεν for Don’t forget?

Μην is used for prohibitions/negative commands in Greek (often with the subjunctive).
Δεν is used for negating statements/facts (e.g., Δεν ξεχνάω = I don’t forget / I’m not forgetting), not for telling someone don’t do X.

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What exactly is ξεχάσεις (tense/mood/person)?

ξεχάσεις is 2nd person singular (you) in the aorist subjunctive of ξεχνάω/ξεχνώ (to forget).
With Μην + subjunctive, it functions like a negative command: Μην ξεχάσεις… = Don’t forget… (especially “don’t forget this one time / in this situation”).

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Is there a difference between Μην ξεχάσεις and Μην ξεχνάς?

Yes—often a nuance of one-off vs. ongoing/habitual:

• Μην ξεχάσεις την απόδειξη: Don’t forget the receipt (this time / when you go now).
• Μην ξεχνάς την απόδειξη: Don’t forget the receipt (as a habit / don’t be forgetting it).

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Why is it την απόδειξη and not η απόδειξη?

Because την απόδειξη is the direct object of the verb (forget what? → the receipt), so it goes in the accusative case.
Dictionary form is η απόδειξη (nominative), but it changes with function in the sentence.

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What does απόδειξη literally mean, and why is it used for receipt?

απόδειξη literally means proof/evidence, but in everyday Greek it also means a receipt (proof of purchase). In stores you’ll commonly hear η απόδειξη; = the receipt?

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What does σε περίπτωση που mean grammatically, and why is που there?

σε περίπτωση που is a fixed-like expression meaning in case (that).

• σε
  • περίπτωση = in (the) case
• που introduces the clause (similar to that/when in English, depending on context).
  It’s a very common way to introduce a contingency.

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Why is χρειαστεί in that form?

χρειαστεί is 3rd person singular aorist subjunctive of χρειάζομαι (to need), used impersonally here:
σε περίπτωση που χρειαστεί… = in case it is needed / in case you end up needing…
Greek often uses “it is needed” structures where English uses “you need.”

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Why is there no article before επιστροφή?

Because επιστροφή is being used in a general/indefinite sense: in case a return is needed.
You could also see:

• μια επιστροφή = a return (more explicitly indefinite)
• την επιστροφή = the return (more specific, context-dependent)

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Does επιστροφή mean return as in returning an item, or can it mean other things?

It can mean several kinds of “return” (coming back, refund/return), but with απόδειξη (receipt) it strongly points to a shop return/refund context.

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Why is there a comma after την απόδειξη?

It separates the main instruction (Μην ξεχάσεις την απόδειξη) from the conditional phrase (σε περίπτωση που…). It’s the same kind of pause you’d naturally make in English: Don’t forget the receipt, in case…

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How would I make this more formal or address more than one person?

Change the verb to match the person/number:

• Singular informal: Μην ξεχάσεις…
• Plural / polite (to one person): Μην ξεχάσετε…
  So: Μην ξεχάσετε την απόδειξη, σε περίπτωση που χρειαστεί επιστροφή.

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Any pronunciation traps in this sentence?

A few common ones:

• απόδειξη is pronounced roughly a-PO-dhik-si (the ει sounds like ee, and ξ = ks).
• χρειαστεί: hree-a-STEE (stress on the last syllable: -στεί).
• Μην: final -ν is usually pronounced before a following consonant here (Μην ξε-…).