Breakdown of C'est le bal au milieu duquel il est parti.
être
to be
il
he
ce
it / this (with être)
partir
to leave / to depart
au milieu de
in the middle of
le bal
the ball (formal dance)
duquel
of which / from which (relative pronoun; agrees with its noun)
Questions & Answers about C'est le bal au milieu duquel il est parti.
Why is duquel used here instead of just lequel?
The phrase for "in the middle of" is au milieu de. The relative pronoun refers back to le bal, which is masculine singular, so we need lequel. When the preposition de combines with lequel, they must contract to form duquel.
Since dont also means "of which", could I say "au milieu dont"?
What if the noun was feminine, like la fête (the party)? How would the sentence change?
Just to review, why is it est parti and not a parti?
The verb partir (to leave) is one of the specific verbs of motion and change of state that always uses être instead of avoir as its helper verb in the passé composé.
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