Unit 48: Relative pronouns - other aspects
1 De qui / duquel
These are used as part of a longer phrase containing a preposition :
1.1 De qui
De qui is used for people:
L'homme avec l'aide de qui j'ai trouvé les documents ...
The man with whose help I found the documents ...
La femme près de qui j'étais assise ...
The woman next to whom I was sitting ...
1.2 Duquel, de laquelle, desquels, desquelles
And duquel and derivatives are used for things (note that de laquelle is always two words):
La montagne sur les pistes de laquelle il y a toujours beaucoup de neige ...
The mountain on whose slopes there is always plenty of snow ...
La maison près de laquelle l'incident a eu lieu ...
The house near to which the incident took place ...
2 Où 
Où can be used to express various ideas of time and place where auquel or dans lequel would otherwise be used:
La ville où l'on m'a envoyé
The town to which I have been sent
A l'époque où je l'ai connu
At the time (that / when) I knew him
3 Ce qui, ce que, ce dont
These are used when referring to a non-specific idea:
Dis-moi ce qui s'est passé
Tell me what happened
Prends ce que tu veux
Take what you want
Voilà ce dont vous avez besoin
Here's what you need
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