(a) may be more formal, but the distinction I see is one of emphasis. Example: we have been discussing something for 20 minutes, and I don't think you have considered everything. Can you not understand.....?
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AlpheccaStarsI'd judge ( a) to be rhetoric and ( b) to be ordinary conversation.(I hope) I see your point.... thanks!
MUSCOVITEI wonder if this "piece of grammar" is addressed (in more detail) in any English grammar books? If you can point me in the right direction, it would be great.I think you're asking for the chapter of a book that hasn't yet been written!
MUSCOVITE(a) 'Can you not understand that liberty is worth more than ribbons?'(b) 'Can't you