Confused about capital gains exemption

[Susannah Bonn]

Do you pay capital gains taxes when you sell in a house that you lived in for two years and then rented out for three?  It fits the 2/5 year rule but not sure whether it fits the "primary residence" part.  Does the rule assume you'll rent it for the other portion of the 5 years or that you'll leave it vacant in order to call it your "primary residence"?  Thank you!