Modern Greek, as presented by Houlton, et al., only has an active and passive. (cf. Holton, David; Mackridge, Peter; Philippaki-Warburton, Irene; Spyropoulos, Vassilios (2012-03-29). Greek: A Comprehensive Grammar of the Modern Language (Comprehensive Grammars) (Kindle Locations 5499-5507). Taylor and Francis. Kindle Edition)). This is the most current academic grammar of modern Greek. The following chart shows the list of forms:
Houlton, et. al. in their Greek a Comprehensive Grammar of the Modern Language (GCGML) does not even list the term 'middle'. It is not in his indices either. Under voice, he lists:
Under the Passive entry he lists some middle usages:voice 51, 128, 129, 134, 139, 269, 275–284, 613, 620; see also active and passive
For definitions he gives:reciprocal use of 283–284, 583–584; reflexive use of 246, 282–283, 580;
Regarding deponents he says:DEF: DEPONENT a verb without active forms (at least in the imperfective) (κάθομαι ‘I sit’, κοιμάμαι ‘I sleep’)
DEF: PASSIVE VOICE the set of verb forms that exhibit passive inflection; when a verb is in the passive voice its subject typically is not the person or thing doing the action but the person or thing acted upon (cf. active voice)
1.4.3 Deponent verbs The term deponent verb refers to a verb which appears with passive morphology but is active in its meaning. Such verbs may be transitive, such as θυμάμαι κάποιον ‘I remember someone’, δέχομαι κάποιον ‘I receive, accept someone’, λυπάμαι κάποιον ‘I pity, feel sorry for someone’, φοβάμαι κάποιον ‘I fear someone’ and περιποιούμαι κάποιον ‘I take care of someone’.
-- (1) Δέχτηκε την πρότασή μας αμέσως ‘He accepted our proposal immediately’
--(2) Η Ελένη φοβάται το σκοτάδι ‘Helen is afraid of the dark’ Deponent verbs may also be used intransitively, such as έρχομαι ‘I come’, κοιμάμαι ‘I sleep’, γίνομαι ‘I become’:
--(3) Όταν έρχομαι στην Αθήνα κουράζομαι πολύ ‘Whenever I come to Athens I get very tired’ Some of the transitive deponent verbs may also appear as intransitives, e.g. λυπάμαι ‘I am sad’, φοβάμαι ‘I am scared’:
--(4) Φοβάται και λυπάται χωρίς να ξέρει γιατί ‘He is fearful and sad without knowing why’
For those who do not have access to a modern Greek grammar, they should note that the classical θη (η) middle/passive form has for the most part fallen out of usage - though there are remnants in usage. (See GCGML 7.2.2.3). The morpheme θ- appears in the aorist indicative (simple past) - there are no distinct aorist middle forms in modern Greek. θ- also appears in the subjunctive (dependent) passive, and perfect passive construct with ἔχω ( ἔχω λυθῆ).§7.1.9. ...Deponent verbs have only passive forms. Examples (from this very numerous category): αισθάνομαι ‘Ι feel’, απολογοήμαι ‘Ι defend myself’, αρνοήμαι ‘Ι refuse’, αφηγοήμαι ‘Ι narrate’, εργάζομαι ‘Ι work’, μιμοήμαι ‘Ι imitate’, φαίνομαι ‘Ι appear/seem’, φοβάμαι ‘Ι fear’.
The rows in the following chart show the passive voice forms for the (1) present tense, (2) imperfect tense (3) aorist (simple past) tense, (4) future tense with θα (5) perfect tense and (6) participle