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« on: October 24, 2012, 12:02:34 AM »
I'm sorry for a late response, Sir. That was due to a terrible network outage over this past three days in this part of the globe. As to the conversion of those passive-voice sentences you've supplied into active-voice constructions, I must say confidently that I can do so with such a remarkable easiness, as opposed to what you believe. For example, letting 'Maria' to be the subject or doer in the active-voice sentences and randomly picking only one of the sentences for the sake of saving time, we will certainly get this grammatically and semantically acceptable sentence ''Maria saw the lovers kissing.''
But I'm absolutely sure that this argument wouldn't be protracted this far if I had perhaps made it in a clear and an effective way since the beginning. First of all I should maybe note that I don't contest the reality that not all active-voice sentences can be made to become passive-voice sentences, because I'm already aware of how the intransitive verbs operate in English sentences. My argument rather centers on the fact that for a sentence to qualify as a passive-voice, it has to be transformable into its logical active-voice version without any difficulty.
Now to get the sense of what I'm talking about and to improve my line of thought, let's have a look at this two outwardly similar but inwardly completely different constructions: ''He has been killed in a plane crash'' and ''He has been killed at a bus stand.'' At first blush both sentences appear to use ''be'' as an auxiliary verb, but at closer look it's the latter that so uses the verb while the former applies it a its main verb. Stated differently, the former is never a passive-voice sentence while the latter is.
That the two sentences have applied verb ''be'' in a very different way can also be proved, as I argued earlier, by finding out the possibility of each to be converted into an active-voice sentence. So if we let again Maria as our subject or doer for the active-voice sentence, the latter will change into this sensical, semantically unassailable construction: ''Maria killed him at a bus stand.'' But things never are as smooth if we attempt to do same thing on the former, in which case we'll surely end up with this impossible, semantically defective construction: ''Maria kiiled him in a plane crash.''
It is indeed the impossibility of the former to be changed into a logical active-voice sentence that accounts for the case I've been promoting that not all ''be+past-participle'' constructions falls under the class of passive-voice constructions, as you want to suggest. There are as many sentences that uses the past participle as an adjective rather than an action verb, and that's simply shown by looking at how the ''be'' behaves and at how its corresponding active-voice sentence would make sense.