None of us smoke(s).
None of my children has/have blond hair.
"I'd like some more cheese." "I'm sorry there's none left".
"Have you any idea how much this cost?" "None at all/None whatsoever."
Since none of us had been there before we hired a guide who claimed that he knew English and then we began looking at the ruins. (Preliminary English Test; B1; Danish)
I'm certainly not going to tell Lara how much money I've spent - it's none of her business!
You might think it's none of my business, but I simply have to say this. (First Certificate in English; B2; Swedish)
His clothes were none too clean.
So, without further ado I accepted, although I was none too sure of what was going to happen there. (Certificate of Proficiency in English; C2; Portuguese)
She must have explained the theory three times, but I'm still none the wiser.