Anonymous
Here, "is vanished", are we taking it as an intransitive?
If yes, then, are all intransitives be able to form present perfect sentences?
I'm not an expert on grammar or linguistics, but here are my thoughts as an ordinary native user of English. I hope I got all the grammatical terminology correct!
I think that all verbs -- transitive or intransitive -- are able to form present perfect sentences: "He has died", "It has vanished", "They've eaten all the pies". At least, I can't think of any verbs that can't, or any reason why they should exist.
"Is" (or, analogously, "are", "was" or "were") followed by the past participle of a transitive verb can range from a pure passive use ("I'd be astonished if that record is broken by an American") to an adjectival use ("This watch is broken."). In the latter case, the idea that the watch has been broken by something or someone, though in theory implied by the word "broken", is weak or non-existent, and "broken" behaves as an adjective that just describes the present state of the watch (just like "The watch is heavy"). Moreover it can be placed before the noun: "A broken watch".
"Is" followed by the past participle of an intransitive verb can't form an passive sentence in the usual sense: "He is/was died by a heart attack" is wrong. So, if the sentence "The watch is vanished" is interpreted as an ordinary passive then it must be the case that "vanished" is used transitively. (There is, however, something called the "impersonal passive". The usual examples are things like "it is believed", where we are not saying that the thing believed is "it" (ordinary passive), but just that there is a general sense of people believing. I'm not very clear if and how "is vanished" might fit this sense.)
The remaining possibility is that the past participles of intransitive verbs (such as, perhaps, "vanish") can, by analogy with the adjectival use of transitive past participles, be used adjectivally -- even though the "background" meaning that I mentioned earlier can't exist even in theory. Let's look at some examples. "It is existed" and "It is behaved" are completely wrong. "He is died" is not quite completely wrong but could (to me) only be used in certain special situations, such as jokey use or attempts at recreating or preserving archaic language. In most contexts it would sound unnatural. Are there any intransitive past participles that are natural adjectives in everyday language? One candidate that comes to mind is "fallen", in the sense of "fallen from a state of respectability". For example, "a fallen woman" is perfectly good English to me (though "she is fallen" still has a slight sense to me that it is an archaic form of "she has fallen").