It would be ils se promène, I believe, but it could be promèner, check to see if your verb needs to be conjugated.
Hi there! The correct answer is "nous y allons samedi".
The word "y" replaces the words "au parc", because the word "y" always stands for a location.
The place of the word "y" in the sentence is in front of the direct verb.
These two things add up to the following conclusion: the correct sentence is "nous y allons samedi."
1 - Je cours vite car j’ai un examen a 8h.
2 - Nous allons servir du fromage a la fête de ce soir.
3 - Mes parents sortent parfois le week-end.
4 - Mon père sort a 18h30 de son bureau.
5 - Je pars pour Chicago lundi matin.
