navinci

[shut eagle]

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[stoic spear]

Section 2
Before I start, just a bit of a general correction. The exercise is making you reverse the object pronoun in the question with the subject pronoun. From the example question, we have « Tu me téléphoneras ? » transformed into « Je t'ai déjà téléphoné ». Here, we see that in the example question, the subject pronoun tu in the example question gets turned to the object pronoun te (becoming t' because of « avoir ») in the example answer, and the object pronoun me in the example question gets turned to the subject pronoun je in the example answer. As we can see from questions number (2), (3), and (6), the object pronoun in the question is me so it shouldn't become nous in your answer. Now, for the questions…
(1) I don't know if you've learned the adverbial pronoun « en » yet in which case if you haven't, disregard this. However, given that you already have « y » in (5), I assume you already did. Anyway, the direct object here is « des fleurs » not « les fleurs » so « les » is not appropriate here.
(5) The order of object pronouns is fixed so you can't have « y » happening between « avoir » and the past participle. Refer to the order in this article.

Section 3
Just letting you know that « vous » doesn't always imply plurality; it can also imply politeness to someone superior to you like your boss. The answers with « nous » are valid – though I personally hesitate on some.
(2) Missing the time adverb in the answer.
(5) Missing the second half of the negation.