Usages of κάποιος
Αν κάποιος δεν απαντήσει, ρωτάω άλλη μια φορά.
If someone doesn't answer, I ask one more time.
Κάποιος περιμένει έξω.
Someone is waiting outside.
Elon.io is an online learning platform
We have an entire course teaching Greek grammar and vocabulary.