Составить несколько предложений с модальными глаголами по теме "защита окружающей среды". буквально чутьчуть! """

I think everyone CAN take care about our planet. First of all we MUSTN'T litter. Also we SHOULD use the recycable matirials, such as paper bags etc.  

1. People should not litter.
2. Everybody must throw garbage into the garbage cans.
3. People have to protect the environment.