Before the invention of the printing press, books had all been printed by hand.
What part of speech is "all" here? Adverb? What kind of adverb?
Before the invention of the printing press, books had all been printed by hand . "All" is a 'determinative' here, functioning as an adjunct.
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Before the invention of the printing press, books had all been printed by hand.
"All" is a 'determinative' here, functioning as an adjunct.