Present Indicative
  
  Contract verbs   Contractions
I call       καλ => καλ    + ω  => 
you (sg.) call  
he/she/it calls  
    καλ-εις
    καλ-ει
=>
=>
καλεῖς
καλεῖ
   + ει  => εῖ
you (pl.) call       καλ-ετε => καλεῖτε    + ε   => εῖ
they call       καλ-ουσιν => καλοῦσιν    + ου => οῦ