of which
exp.
dont
which
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which
(in questions)
quel (le)
Which picture do you want? Quelle photo voulez-vous?
Which flavour do you want? Quel parfum veux-tu?
I know his brother. -- Which one? Je connais son frère. -- Lequel?
I know his sister. -- Which one? Je connais sa sœur. -- Laquelle?
in which case auquel cas
→ He may have already seen it, in which case we can go see something else.
(=which one(s)) lequel (laquelle) , lesquels (lesquelles) pl
Which of these are yours? Lesquels sont à vous?
Which would you like? Lequel voulez-vous?
Tell me which you want. Dites-moi lesquels vous voulez.
I don't mind which. Peu m'importe lequel.
not to know which is which ne pas savoir lequel (laquelle) est lequel (laquelle)
→ Our jackets look so similar, I don't know which is which.
Even the twins' teacher doesn't always know which is which. Même le professeur des jumeaux n'arrive pas toujours à savoir lequel est lequel.
(after preposition)
lequel (laquelle)
the chair on which you are sitting la chaise sur laquelle vous êtes assis
the box in which the keys are kept la boîte dans laquelle les clés sont rangées
the charity to which he donated money l'œuvre de bienfaisance à laquelle il a fait un don
of which dont
the book of which you spoke le livre dont vous avez parlé
after which après quoi
→ He insulted the host, after which he left.
(subject of relative clause)
qui
the apple which is on the table la pomme qui est sur la table
the CD which is playing now le CD qui passe maintenant
He knew, which is incredible. Il le savait, ce qui est incroyable.
(object of relative clause)
que
the apple which you ate la pomme que vous avez mangée
the CD which I bought today le CD que j'ai acheté hier
Translation English - French Collins Dictionary  

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"Collins English French Electronic Dictionary © HarperCollins Publishers 2005"