In French, there are two ways to introduce a relative clause with a preposition.
How to use a relative pronoun with a preposition in French
Look at these sentences:
La fille derrière laquelle je suis assis est belle.
The girl behind whom I'm sitting is beautiful.
To introduce relative clauses with a preposition (on/behind/with/for...which), there are two ways in French:
- preposition + qui (whom), which can only apply to living things
- preposition + lequel / laquelle / lesquels / lesquelles (living or non-living)
Note: these forms agree in gender and number with the object they refer to
ATTENTION: you cannot use preposition + quoi, either for living or non-living things. Only the options above are correct in French.
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Examples and resources
La fille derrière laquelle je suis assis est belle.
The girl behind whom I'm sitting is beautiful.
Le bébé avec lequel elle joue, est mon neveu.
The baby she plays with is my nephew.
Jacques, devant lequel je suis assis, est mon meilleur ami.
Jacques, in front of whom I'm sitting, is my best friend.