Want to study? Want to change careers? This is the perfect time, and Breyertino University is the place for you. Here it teaches in a healthy and cooperative environment. We offer a wide variety of titles, for example to be a pilot, photographer, actor, mechanic, musician, veterinarian... and much more. There are support classes that offer help for gardeners, vendors, butchers... and even clowns.
Ellas responden is the correct conjugation
For #3 you could put La gente en el centro comercial nos entiende. (The people at the mall understand us.)
I don't know about #4 sorry.
But hopefully this helps
