Bonjour j’au besoin d’aide pour ces exercices d’anglais(ex 115/116) 4éme

Hello,

115)
If we walk or recycle, we won't pollute so much.  
If you eat too much processed food, you will get fat.  
Pledge you won't lights on unncessarily. 
You will save energy if you take shorter showers.
If we do nothing, more catastraphoes may happen. 
Who knows? In a few years cars may be forbidden.