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I think "the best book ever written" is an elision for "the best book that has ever been written", which is present participleparticiple perfect in passive voice.
Edit: typo
I think "the best book ever written" is an elision for "the best book that has ever been written", which is present participle in passive voice.
I think "the best book ever written" is an elision for "the best book that has ever been written", which is present participle perfect in passive voice.
