What if I told you that, in just a few short sentences, I could teach you something about grammar that would set you head and shoulders above a large portion of the population? Why, you’d want to send me money, right? And I’d want to let you. So, without further ado, here it is.
It’s not “I feel badly.” It’s “I feel bad.”
Actually, there are instances in which you’d want to use “I feel badly.” But those are so rare that you can go a whole lifetime without ever needing the term. If you’re saying you feel guilty, sorry for someone, remorseful or anything like that, the grammatically correct term is “I feel bad.”
But now, what if I told you that, on some level, you knew that already — that I’m just pointing out a rule that every native English speaker gets right in many other situations, even if they don’t know they know it. Why, you’d want to tear up the check you’d just made out to me and not pay me anything at all, wouldn’t you? That’s why those of you with your checkbooks already out should stop reading here. For the rest of you, here’s the deal.