Here’s something I’ve just found.
Moreover, even intransitive verbs with prepositional objects may be used in the passive (sometimes teated as pseudopassives). English has an exceptionally rich variety of preposition stranding phenomena, the most striking of which is the prepositional passive—the possibility of passivizing the object of a preposition instead of the direct object of a verb.
Active: People spoke much about that book (prepositional object).
Passive: The book was much spoken about.
Active: You can rely [on David] to do get the job done.
Passive: David can be relied on to get the job done. Íà÷àëîôîðìû
There are a few cases of common (verb + preposition) expressions, however, where such passives can be constructed:
....This bed has been slept in,
....This bed was slept in by Napoleon.
....These carpets have never been walked on.
....These chairs are not to be sat on
The subject of this passive construction corresponds to an adverbial modifier of place in the active construction. The preposition also retains its place after the verb.
...The occupant of the apartment was fully clothed, although the bed had been slept in.
...The room looked as if it had not been lived in for years.
...The high-backed ugly chairs looked as if they had once been sat in by cardinals.
The use of this construction is very rare and usually occurs with the verbs mentioned in the examples.