My friend came to Canada on vacation. I drove him around and he said he wanted to try driving here. I let him drive and he almost crashed my car. He made a turn and drove on the wrong side of the road.
http://www.mto.gov.on.ca/english/dandv/driver/handbook//section1.1.0.shtml
If you live in Ontario, you must be at least 16 years old and have a valid Ontario driver’s licence to drive in this province.
If you are a visitor to Ontario and want to drive while you are here, you must be at least 16 years old and have a valid driver’s licence from your own province, state or country. If you are from another country and visiting Ontario for more than three months, you need an International Driver’s Permit from your own country. If you are taking up residence, you must get an Ontario driver’s licence.
If you are a new resident in Ontario and have a valid driver’s licence from another province, state or country, you can use it for 60 days after you move to Ontario. If you become a resident of Ontario, you must get an Ontario driver’s licence. Ontario has licence exchange agreements with every Canadian province and territory (including Canadian Forces Europe). Also with Australia, Austria, Belgium, France, Germany, Great Britain, the Isle of Man, Japan, Northern Ireland, Korea, Switzerland and the United States.
https://www.ontario.ca/document/official-mto-drivers-handbook/getting-your-drivers-licence