I'm reading "The Blue Book of Grammar and Punctuation", and there are some tests in the first chapter. There is this sentence, which needs to be corrected: That was Yusuf and me whom you saw.
The correct answers is: That was Yusuf and I whom you saw.
But why? I can't understand the reason.
I also have two other related questions: I was listening to a song and the lyrics were "no one hurts this pretty girl but her" Is her correct? Shouldn't it be a subject pronoun?
Another song related question. The title of a song is "The Devil in I". Is it correct or should it be "The Devil in Me"?
*both songs are by Slipknot, for anyone who is interested.