2/5 year Cap gains exemption-Moving from one unit to next-Triplex

[Susan O.]

So for if i was doing a triplex living in 1 unit then another unit 2 years each could I take advantage of 4 yrs of 5 yrs moving from one unit to another with the sect 21 cap gains exemption? so 2/5 years in one unit and 2/5 years in another unit

When I convert a rental unit into an owner occ unit then would I have to pay back the recapture dep tax that year?
I lived in one unit 2016-2018, another unit 2018-2020, and I plan to sell at end of 2020. This is for a triplex that I owner occupy too thanks! Susan