I recently learned (in my mid-40s) that I’ve been figuring this out the hard way most of my life.
I always diagram the sentence in my head, as in: The subject is fear, the object is Rush, so it’s ‘whom.’
My wife has a simple grammar rule that ifhim/her
works then it’s whom, ifshe/he
fits better then it’s who.I feel like my primary school teachers did me dirty.
It’s always great to learn more. Next you can relearn colons.
“In modern English usage, a complete sentence precedes a colon, while a list, description, explanation, or definition follows it.” https://en.m.wikipedia.org/wiki/Colon_(punctuation)
I think it’s more technically correct as “of whom are you afraid” as you should not end a sentence with a preposition.
Then again, I’m a software engineer so perhaps not.
You can end a sentence in a preposition, and whom isn’t a preposition anyway. It’s a pronoun.
Ending sentences with prepositions is something up with which I will not put!
It’s fine to end a sentence with a prepositional or phrasal verb. https://www.grammarly.com/blog/end-sentence-preposition/
Bork, you’re a Federal Agent. You represent the United States government. Never end a sentence with a preposition!