Breakdown of Tu feras le documentaire dont nous avons parlé.
tu
you (informal singular)
nous
we / us (object pronoun)
parler
to speak
faire
to do, to make
dont
whose / about which / of which
le documentaire
the documentary
Questions & Answers about Tu feras le documentaire dont nous avons parlé.
Why do we use dont here instead of que?
In French, you say "to talk about something" using parler de. Because the verb takes the preposition de (e.g., nous avons parlé du documentaire), you must use the relative pronoun dont to connect the ideas. If the verb didn't require de—like voir (to see)—you would use que instead.
Where is the word for "about" in the French sentence?
It is built right into dont! In English, we often leave prepositions like "about" at the end of a sentence ("the documentary we spoke about"). In French, you can never end a clause with a preposition. The "about" (the de from parler de) is absorbed by dont, which acts a bit like saying "about which we spoke."
Since dont refers to le documentaire, shouldn't parlé have an agreement?
No, it does not change. In the passé composé, you only make the past participle agree with a direct object that comes before the verb (which happens often with the pronoun que). Because parler uses de, its object is indirect. The pronoun dont replaces this indirect object, so it never triggers past participle agreement.
Why is the future tense tu feras rather than using the full infinitive?
The verb faire (to do / to make) is irregular. Instead of building on its infinitive like regular verbs do in the future tense, it uses the special irregular stem fer-. You then add the standard future ending for tu, which is -as, giving you tu feras.
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