Réponse:

a.

1- If you don't use your car to go to work, i won't take the bus to go to school.

2- If you're able to reduce food waste, i promise to clean my room every 3 days.

3- I challenge you to use eco-friendly detergent and it you do, i will turn off my phone every night after 8 pm.

b. I challenge you to have games every class and if you do that, we accept to have a 5-10 minute test once 1 week

Voila, j'espère t'avoir aider.