Answer: When I realized I was wrong, I apologized for my mistake.
Step-by-step explanation:
Incase you get the for's messed up, here.
The most common member of this trio is the preposition “for,” which is not a problem for most people. “Fore” always has to do with the front of something (it's what you shout to warn someone when you've sent a golf ball their way). “Four” is just the number “4.” (-source)