No. 4,207 in French

duquel

"Duquel" means "of which" or "of whom" in English and is a masculine singular form used in formal or complex sentences.

In a sentence

Le livre duquel j'ai parlé est sur la table.
The book I talked about is on the table.
"Duquel" is used as a relative pronoun combining "de" (a preposition) and "lequel" (a pronoun), to refer to a specific antecedent, "le livre".
Voici le dossier duquel nous avons extrait les informations.
Here is the file from which we extracted the information.
"Duquel" serves to introduce a relative clause, replacing "de" + "lequel", connecting the noun "le dossier" to the action described.
C'est un sujet duquel je ne connais presque rien.
This is a subject about which I know almost nothing.
"Duquel" is used to show possession or relation to "un sujet", indicating the association between "savoir presque rien" and "un sujet".

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