Answer:
1. "Tu joues au foot le lundi." means "You play soccer on Mondays."
2. "Vous nagez à la piscine le mardi." means "You swim at the pool on Tuesdays."
3. "Il fait mauvais. On désire sortir avec les amis." means "It's bad weather. We want to go out with friends."
4. "Jennifer, elle joue au hockey sur glace." means "Jennifer plays ice hockey."
5. "Je te présente Delphine." means "I introduce you to Delphine."
6. "Nous te présentons Monica." means "We introduce you to Monica."
7. "Il s'appelle Gaïtan." means "His name is Gaïtan."
8. "Monsieur et Madame Charpin, désirez-vous une salade ?" means "Mr. and Mrs. Charpin, do you want a salad?"
These sentences showcase different verb forms in French and demonstrate how they are used in various contexts.