First, you need to determine your residency status. If you are considered a non-resident for tax year 2017, you might not need to file a tax return. But there are some exceptions. Consult the below content (with special attention to the "Do I have to file a return" section) and if you are unsure, reach out to the Canada Revenue Agency (CRA).
https://turbotax.community.intuit.ca/replies/2647682
