Common Greek phrases and greetings

Greedings

Hello: Γειά σας (Yia sas) - This is the most common greeting in Greek and can be used for any occasion.
Good morning: Καλημέρα (kalimera) - Use this greeting from sunrise until noon.
Good afternoon/evening: Καλησπέρα (kalispera) - Use this greeting from noon until sunset.
Goodnight: Καληνύχτα (kalinihta) - Use this greeting when you are going to bed.
Goodbye: Αντίο (Adio)
Nice to meet you: Χάρηκα για τη γνωριμία (Harika gia ti gnorimia) - Use this when you meet someone for the first time.
How's your day?: Πώς πάει η μέρα σου; (Pos paei i mera sou?) - A friendly way to ask someone about their day.
What's up? / How's it going?: Τι κάνεις; (Ti kaneis?) - A casual way to ask someone how they are doing.

Thank you: Ευχαριστώ (efharisto) - This is the most common way to say thank you in Greek.
Please/You're welcome: Παρακαλώ (parakalo) - This word can be used for both please and you're welcome.
How are you?:Τι κάνετε; (Ti kanete)?
I'm fine, thank you:Καλά, ευχαριστώ (Kala, efharisto)
Excuse me / Sorry: Συγγνώμη (Sygnomi) - Use this to apologize or to get someone’s attention.
Yes: Ναι (Nai)
No: Όχι (Ohi)
I don't understand: Δεν καταλαβαίνω (Den katalavaino) - Useful when you don't understand something.
Do you speak English?: Μιλάτε αγγλικά; (Milate anglika?) - An essential phrase for English speakers.
I need help: Χρειάζομαι βοήθεια (Chreiazomai voitheia) - Important in case you need assistance.
Where is the bathroom?: Πού είναι η τουαλέτα; (Pou einai i toualeta?) - Always useful to know.
How much does this cost?: Πόσο κοστίζει αυτό; (Poso kostizei afto?) - Important for shopping.
I would like...: Θα ήθελα... (Tha ithela...) - Useful when making a request or order.