In English, many past and present participles of verbs can be used as adjectives. Some of these examples may show the adjective use.
Conversely, the possibility ofpassivizingthe subject of the subordinate clause of ' believe ' verb may suggest that subjects are not licensed internally to the subordinate clause.
From theCambridge English Corpus
As a middle voice, it can be thought of aspassivizingan action without using passive voice syntax.
From
Wikipedia
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