You do not say "Happy Good Friday" in greek.... you actually say "Good Resurrection" which is "Kali Anastasi"
Καλός [kalos]
Καλό ψάρεμα [kalo psArema]
It is "Ωραίο φαγητό" (oreo fagito)
καλή παρέα [kalEE parEa]
τις καλύτερες ευχές
Its ''καλά αποτελέσματα'' (kala apotelesmata).
Its καλό κορίτσι (kalo koritsi)
The Greek version is "Καλή εβδομάδα" or a bit more casually "Καλή βδομάδα"
The Greek Translation for the English word Great as in size is Megalos.The Greek Translation for the English word Great as in Good is Kalo.
The Greek word 'kalimera' is often heard and translates into English as 'good morning'. 'Kalispera' is the equivalent Greek word to use if you wish to say 'good evening'.
Είμαι καλά [eeme kala]