Pronouns

There are two objects in this sentence: “des questions” (indefinite plural noun) and “au professeur” (indirect object).
We replace “des questions” with the pronoun “en” — it replaces quantities or indefinite nouns introduced by “de.”
“Au professeur” is an indirect object introduced by “à” and referring to a person, so we replace it with “lui.”
The correct order of pronouns is: lui en.
So the sentence becomes: Mathilde lui en pose.

We need to replace two elements: the person “Vincent” and the place “au carnaval.”
“Vincent” is a masculine proper noun, and we refer to him with the stressed pronoun “lui.”
“Au carnaval” is a location preceded by the preposition “à” — so we replace it with the adverbial pronoun “y.”
The verb “va” stays as is, since it refers to “tout le monde” (third person singular).
So the transformed sentence becomes: Selon lui, tout le monde y va.

“Élèves” is masculine plural, so we need to match both forms accordingly.
In the first blank, it is followed by a noun, so we use the adjective form: Quels.
Quels élèves veulent manger ? (Which students want to eat?)
In the second blank, the noun is omitted — we are asking “which ones,” so we use the pronoun: Lesquels.
Lesquels veulent partir ? (Which ones want to leave?)
Final sentence: Quels élèves veulent manger et lesquels veulent partir ?

The verb “sortir” in this context is used with the preposition “avec” to go out with someone.
“Copains” is masculine plural → use “avec qui.”
So the correct sentence is: Ce sont mes copains avec qui je sors souvent `a l’´etranger.

We have a direct object “les cahiers” and a location “dans la salle des professeurs.”
“Les cahiers” is replaced by the direct object pronoun “les.”
“Dans la salle des professeurs” is a prepositional phrase of place, so we use the pronoun “y.”
The correct order is: les y.
So the full sentence becomes: Antoine les y met.

Here, “un appartement” is the direct object of “renouveler.”
We need a relative pronoun that replaces a direct object → use “que.”
Since the verb already has a subject “nous,” “que” works perfectly.
Correct sentence: Nous avons achet´e un appartement que nous allons renouveler.

The verb “travailler” is used here with the preposition “sur” → “travailler sur un projet.”
When the preposition is required, we cannot use just “que” or “dont.”
We use the relative construction “sur lequel” (masculine singular to match “projet”).
Correct sentence: Le projet sur lequel je travaille est tr`es difficile.

We need a relative pronoun that replaces the subject of the second clause: “est sur la table.”
“Qui” is used as a relative pronoun when it replaces the subject of the verb that follows.
Here, “la peinture” is the subject of “est.”
So the correct sentence is: La peinture qui est sur la table est une peinture de Renoir.

The verb “habiter” alone means to live in a place, but this sentence only makes sense if it means “I live near the school.”
So the full meaning is: “The school near which I live was built in 1900.”
“École” is feminine singular → use “près de laquelle.”
Correct sentence: L’´ecole pr`es de laquelle j’habite date de 1900.