Greek has six tenses for finite verbs:
Tense Voice present active (1st pp)
middle/passive (1st pp)imperfect active (1st pp)
middle/passive (1st pp)future active (2nd pp)
middle (2nd pp)
passive (6th pp)aorist active (3rd pp)
middle (3rd pp)
passive (6th pp)perfect active (4th pp)
middle/passive (5th pp)pluperfect active (4th pp)
middle/passive (5th pp)