What is vocative case?
When you’re talking/directing something to someone
When does the vocative case change the end of the noun?
If it declines like Logos and is singular
When does the vocative case not change the end of the noun?
Every other situation (incl. plural form of logos). The vocative is the same as the nominative.
Exception to vocative case?
The vocative of Ἰησους is Ἰησου.
What is the vocative case word ending?
–ε eg Πετρε, βλεπω τον κυριον