Good morning – Good evening everybody!
When greeting politely we often add the word σας / sas at the end of our sentences. This indicates the plural and the polite form.
Καλημέρα σας / Kalimera sas = Good morning to you → Polite and Plural form
Καλημέρα / Kalimera = Good morning
Γεια σας / Gia sas (Yassas) = Hello to you → Polite and Plural form
Γεια / Gia (Ya) / Hello
Καλησπέρα σας / Kalispera sas /Kalispera to you → Polite and Plural form = Good evening to you
Καλησπέρα / Kalispera = Good evening