I am hoping some members will help me explore this topic of the middle verb forms. I am now at Section 5-A and B of the Cambridge JACT text.
So far in the book, I’ve seen the present indicative middle (Sect. 2), the present middle participle (Sect. 4) and the imperfect indicative middle (Sect. 5).
I may start with too simplistic a look but for me it will be a start! I am thinking the middle form comes close to resembling the intransitive verb in English (I would like correction there if necessary).
In other words that is probably not right. But I look at just one ‘problem’ in 5A-B. I consider the verb ἐπαυον (imperfect indicative active, meaning ‘I was stopping’) compared to ἐπαυόμεν (imperfect indicative middle). This seems like a good example, seeing it is the same verb for both forms (same verb at least in English). My understanding is that the active form would take an object: ‘I was stopping him’. The middle form would not take an object: ‘I was stopping here.’ (That is why I think the intransitive form in English can help with my understanding.)
I have more. I will give some verbs in English only (please excuse me for that; too long to go with the Greek script). I see that the verbs ‘I was honouring/valuing,’ ‘I was doing’ and ‘I was showing/revealing’ can also go in the imperfect indicative active and imperfect indicative middle forms, just as the Greek verb for ‘I was stopping’ does (all of this is in Section 5).
Perhaps I should try harder and learn how to use Greek script faster, so here is ‘I was honouring/valuing’ in Greek (edit: that should be ‘I was revealing, showing’):
ἐδηλούμην
Here is where I may be stumped. I can’t see how ‘I was revealing’ can be in both forms (yet, it obviously can!). After some thought, maybe I see how it can work: ‘I revealed the painting’ (active). Then there is ‘I revealed myself to be…’ (but that may not really work as an example of the middle form). I am thinking there must be subtle shifts in meanings.
I think I had better stop. But just to say, I have explored here and there and will keep exploring this matter of middle verb forms. To close on an upbeat note, I am cheered to see correspondences from present active to imperfect active and ditto for the middle form.
EDIT: I have had to edit this quite often because I know I am not explaining myself too well. I will need more practice for sure. But I am getting better acquainted with the middle form. The JACT textbook gives more information later on.