Grammar / Case / Vocative

The vocative case is used for direct address.

Examples

• Διδάσκαλε, τί ποιήσωμεν;
  Teacher, what should we do?
• Ναί, κύριε, σὺ οἶδας ὅτι φιλῶ σε.
  Yes, Lord, you know that I love you.