Am I Feeling Bad or Badly?

And how can I tell?

Image by PDPics from Pixabay

Someone asked me a grammar question recently that I thought would be worth discussing. But first, I have to say I get ridiculously excited when someone asks me a grammar or punctuation question. Seriously, I’m like Commander Data scanning for lifeforms on Star Trek TNG, I’m that tickled.

But on to the question: How do you know when to say something like rather…