) (Incidently, I sometimes use "to surface" as a transitive verb in the sense of "to put a surface on something," similar to the more common term "to resurface," which is also used intransitively. ") I can't think of a passive use of "to vanish," as you say. << has vanished/surfaced would have vanished/surfaced could have vanished/surfaced must have vanished/surfaced >> You seem to imply that these could have something to do with passive voice.
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