Something nagging me that I have not really gotten a satisfactory answer for:
What is the difference between using the passive form of a transitive verb and its intransitive variation?
I.E. For example:
(1) ドアを開けた - The door is opened (by John/Sally).
(2) ドアが開けられた - The door has been opened.
(3) ドアが開いた - The door has been opened.
The way I basically understand it is that (1) Says that John opened the door (with a direct object of the door). (2) Says that someone (mentioned or unmentioned) had opened the door and now is in a state of “openness” and (3) I am inclined to say the same as 2 with maybe the caveat that the door may not have been opened by anyone (hence the non-necessity to mention a subject). But are (2) or (3) both essentially 誰か作用された ？
Any sorts of answers (more grammatical or not) are much appreciated! Thank you!