La conférence à laquelle nous avons assisté a été annulée par le directeur.

Questions & Answers about La conférence à laquelle nous avons assisté a été annulée par le directeur.

Why is it à laquelle here instead of contracting to something like auquelle?
While lequel contracts with à to form auquel, the feminine singular form laquelle does not contract. It stays as two separate words: à laquelle. The plurals do contract (like auxquelles), but since la conférence is feminine singular, we use à laquelle.
Why do we need the preposition à in the first place? In English we just say 'attended', not 'attended to'.
In French, the verb meaning 'to attend' an event is assister à. Because the verb requires à, that preposition has to move in front of the relative pronoun, giving us à laquelle (literally 'to which'). If you used a simple relative pronoun like que, the sentence would be grammatically incorrect because the required à would be missing.
Why does annulée have an extra -e at the end?
This is the passive voice in the passé composé (a été annulée). In the passive voice, the past participle always agrees in gender and number with the subject of the sentence. Since the subject is La conférence (feminine singular), annulé gets an extra -e.
If annulée agrees with the feminine noun conférence, why doesn't assisté get an extra -e too?
The rules for agreement depend on the structure. assisté uses the auxiliary verb avoir. With avoir, the past participle only agrees with a direct object placed before the verb. However, la conférence is an indirect object here (because of the à in assister à). Since there is no direct object, assisté does not change.

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