Unrealized gains, from year-to-year

I should definitely know this by now, but do unrealized gains carry over from year to year? It’s funny, I can picture the guy from the Schweser vids going through his explanation on this, but I’m drawing a blank. I swear, I’m forgetting everything I learned these past several weeks.

If they are classified as trading, they do NOT carry over and are recognized on the IS every year. If it is Available for Sale, the unrealized gains/losses carry over every year, however you do recognize them in other comprehensive income.