Can: u can search for wooden sticks , rocks and leaves to build a campfire. U can cut down a tree in case u got an axe.
Can't: u can't eat the fruit from all bushes u see. U can't make very much noises , because u are taking the risk to get attacked by wild animals.
Have to: you have to build a small shelter with sticks and fallen trees (in case that u see one) that can warm u all over the night. You have to build weapons and tool with the materials u got from the nature.
Must: u must hunt animals in case u got any weapon with you.
Mustn't: u mustn't deal with bigger or faster animals than you.
