How do you say is in Greece?

The Word "is" in Greek is "είναι" (ine). Note that Greek language has "persons" (e.g. second person singular etc.) So "είναι" in various persons of the present tenseis:

Εγώ είμαι [sounds like: ego ime] = I am

Εσύ είσαι [sounds like: esi ise] = You are

Αυτός/Αυτή/Αυτό είναι [sounds like: Aftos/Afti/Afto ine] = He/She/It is

Εμείς είμαστε [sounds like: Emis imaste] = We are

Εσείς είστε [sounds like: Esis iste] = You are Αυτοί είναι [sounds like: Afti ine] = They are