Breakdown of Lesquelles as-tu décidé de démonter ?
tu
you (informal singular)
avoir
to have
lequel
which (masculine singular, feminine laquelle, plural lesquels, lesquelles)
décider de
to decide to
démonter
to dismantle
Questions & Answers about Lesquelles as-tu décidé de démonter ?
Why do we need de between décidé and démonter?
In French, many verbs require a specific preposition before an infinitive (an unconjugated verb). The verb décider (to decide) takes the preposition de when followed by an action. So, to say 'to decide to do something', you must always use décider de.
Why is it Lesquelles and not Lesquels?
Lesquelles means 'which ones' and is a feminine plural pronoun. The speaker is referring to a specific group of feminine items (like les chaises or les voitures) that were already mentioned in the conversation. If they were talking about masculine items, they would use the masculine plural form lesquels.
Since Lesquelles is a feminine plural object placed before the verb, why doesn't décidé have an extra 'es' (décidées)?
This is a great catch! Normally, in the passé composé, the past participle agrees with a preceding direct object. However, lesquelles is the object of the infinitive démonter (you are dismantling them), not the object of décidé (you decided to dismantle). Because the direct object belongs to the infinitive rather than the main conjugated verb, décidé does not change.
Is it required to flip the subject and verb to as-tu here?
No, using inversion (as-tu) is just a slightly more formal or written way to ask the question. In everyday spoken French, you will often hear this asked without inversion, such as Tu as décidé de démonter lesquelles ? or Lesquelles est-ce que tu as décidé de démonter ?
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