Re: ask questions to somebody?
I really don't see why a student shouldn't question what they are told by a teacher. It's perfectly feasible for a student to show their teacher this forum to back up their rightfully held doubts.
I will happily add my comments to this:
"Ask questions to each other" is not natural/correct.
Ask each other questions.
Ask questions of each other.
Don't use "from" though, as you suggested in your first post.
Remember - correct capitalisation, punctuation and spacing make posts much easier to read.