My dear, SOP is personalized. That is, it is based on your stats and ambitions. An SOP that is suitable for another may not be good for you. Just note that the SOP (or Letter of Explanation) should state your life ambition and how studying in the Canadian university/college would help you achieve it. It should also state that you would be returning to your home country after the studies, among other facts which you think might sell your case. You make a draft and ask for edit. Goodluck my dear.